Polar Station Facility

Transcription

1 Page 1 of 74 Indra Espacio S.A. Mar Egeo 4 Polígono Industrial nº 1 SAN FERNANDO DE HENARES MADRID - SPAIN Tel./Ph. (+34) Fax/Fax (+34) Polar Station Facility REFERENCE USER STATION ARCHITECTURE DOCUMENT Name Function Signature Date Prepared by E. de Mesa RF Engineer June 2003 Reviewed by J.González Sys. Tech. Manager June 2003 Accepted by J. Ortega Q. Assurance resp. June 2003 Approved by J.González Sys. Tech. Manager June 2003 Authorized by G. Cidón Project Manager June 2003 File: eps-ie-dd-0002_24.doc Document submitted to Alcatel for: X Approval Review Information

2 Page 2 of 74 DISTRIBUTION LIST Internal Copies External Copies File 1 DATA TOOLS 1 ASPI 1 DOCUMENT CHANGE RECORD Issue/Rev. Date Change Description Reason for Change 1/0 April, 2001 Initial version 2/0 June, 2001 General Upgrading Modification after PSF PDR 2/1 July, 2001 Corrections and general upgrading According to RIDs: EPS-IE-DD- 0002/2.0/yl/1 to 2 2/2 Jan., 2002 General upgrading According to RIDs: ALC DD /1 YL0001, ALC DD /1 YL0002 RC#96, RC#98, RC#99, RC#101, RC#102, RC#103, RC#106, RC#109 2/3 Mar., 2002 Update According to RIDs: 34-01, 34-03, 34-04, 34-05, 34-06, 34-07, 34-08, 34-09, 34-13, 34-14, 15-15, /4 June 2003 Update New antenna diameter 2.4m CN-0013, new ICD PAGE CHANGE RECORD Page Iss./Rev. Page Iss./Rev. Page Iss./Rev. Page Iss./Rev /4

3 Page 3 of 74 TABLE OF CONTENTS 1. INTRODUCTION OBJECTIVE AND SCOPE OVERVIEW ACRONYMS APPLICABLE DOCUMENTS REFERENCE DOCUMENTS STATION DESCRIPTION FUNCTIONAL DESCRIPTION HRPT Reception LRPT Reception Power Flux Density evolution of HRPT and LRPT signals Satellite Tracking HRPT and LRPT Distribution Test Subsystem Frequency and Time Subsystem Local M&C Subsystem (LMCS) BLOCK DIAGRAM UNITS DESCRIPTION HRPT Chain LRPT Chain Test S/S Frequency and Time S/S RUS PHYSICAL DESCRIPTION Dimensions Location INTERFACE DESCRIPTION EXTERNAL INTERFACES HRPT data to FEP interface LRPT data to FEP interface Reference Time MetOp HRPT Carrier MetOp LRPT Carrier Site INTERNET POWER SUPPLY M&C INTERFACES ADMIN MESSAGE INTERFACE RUS COMPONENTS ANALYSIS G/T...42 L-BAND G/T ANALYSIS BER HRPT Downlink LRPT Downlink SIGNAL LEVEL MMI SPECIFICATIONS GRAPHIC USER INTERFACE...48

4 Page 4 of SET UP WORLD MAP STATION MIMIC Monitoring function: Control function Operator messages Date and time LOGBOOK REQUIREMENTS TRACEAB ILITY MATRIX LIST OF FIGURES FIGURE 1. RUS FUNCTIONAL BLOCK DIAGRAM...8 FIGURE 2. LRPT POWER FLUX DENSITY...12 FIGURE 3. HRPT POWER FLUX DENSITY...12 FIGURE 4. HRPT AND LRPT INTERFACES TO FEP...14 FIGURE 5. HRPT TESTING CHAIN...15 FIGURE 6. HRPT TESTING CHAIN...15 FIGURE 7 : F&T S/S FUNCTIONAL DIAGRAM...16 FIGURE 8. RUS M&C CONNECTIONS...17 FIGURE 9. RUS BLOCK DIAGRAM...18 FIGURE 10. L-BAND ANTENNA DRIVE BLOCK DIAGRAM...19 FIGURE 11. L-BAND PRE-AMPLIFIER...22 FIGURE 12. L-BAND TO VHF FREQUENCY CONVERTER...22 FIGURE 13. VHF RECEIVER BLOCK DIAGRAM...24 FIGURE 14. VHF ANTENNA DIAGRAM...25 FIGURE 15 TEST TRANSMITTER...27 FIGURE 16 RUS PHYSICAL DIAGRAM...33 FIGURA 17: RUS EXTERNAL INTERFACES BLOCK DIAGRAM...35 FIGURA 18 GRAPHIC USER INTERFACE EXAMPLE...48 FIGURA 19 SET UP PAGE IN MMI...50 FIGURA 20 WORLD MAP PAGE IN MMI...51 FIGURA 21 STATION MIMIC BLOCK DIAGRAM...52 FIGURA 22 LOGBOOK...58 LIST OF TABLES TABLE METOP HRPT LINK CHARACTERISTICS...10 TABLE METOP LRPT LINK CHARACTERISTICS...11 TABLE HRPT AND LRPT ELECTRICAL INTERFACES TO FEP...14 TABLE L-BAND ANTENNA DRIVE AND MECHANICAL CHARACTERISTICS...21 TABLE LNA AND DC ASSEMBLY CHARACTERISTICS...23 TABLE FORMAT OF HE ADMIN MESSAGE...37 TABLE ADMIN MSG STRUCTURE FOR PFS/RUS...38

5 Page 5 of INTRODUCTION 1.1 OBJECTIVE AND SCOPE This document describes the design aspects of the Reference User Station (RUS) to be installed in the frame of PSF Project in Darmstadt (Germany) for MetOp satellites acquisition data and tracking. 1.2 OVERVIEW This document is structured as follows: Chapter 1: Chapter 2: Chapter 3: Chapter 4: It is this introduction you are currently reading. This section is a description of the RUS station. This chapter goes into a description of the RUS interfaces. This chapter states the requirements trace ability matrix.

6 Page 6 of ACRONYMS 1.4 APPLICABLE DOCUMENTS AD-1 AD-2 AD-3 MetOp Space to ground Interface Specification MO-IF-MMT-SY-0001 HPRT/LRPT Direct Broadcast Service Specification EPS/SYS/SPE/95413 Polar Station Facilities Interface Specifications EPS-ASPI-IR REFERENCE DOCUMENTS RD-1 RD-2 RD-3 RD-4 RD-5 RD-6 Glossary of Terms and Abbreviations Ref. IPS-IE-LI-0001, Issue 1/0, Feb. 01 PSF Requirements Specification. Ref. EPS-ASPI-SP-0087, date 01/02/01, issue 2.0 Polar Station Facility Interface Specification. Ref. EPS-ASPI-IR-0088, dated 31/01/01, issue 2.0 PSF General System Architecture Document. Ref. EPS-IE-DD-0001 Minutes of Meeting 06/03/01 PSF FURM. Ref. EPS-ASPI.MN CGS MMI Standards EPS-ASPI-SP-0195

7 Page 7 of STATION DESCRIPTION The Reference User Station will constitute the reference station for the potential users of the Local Mission function (HRPT and LRPT signals reception) of the MetOp satellites. This station will be able to carry out the following functions: 1. MetOp satellites tracking. The L-band antenna will follow the MetOp satellites in program track with data received from the FEP. VHF antenna will be cross dipole type, therefore no tracking is needed. 2. Simultaneous acquisition and demodulation of HRPT and LRPT signals. The Viterbi decoded data bits from both HRPT and LRPT will be distributed to the FEP. The two data flows from the two demodulators will be directly cabled to the FEP. 3. Local monitoring and control functions. The M&C is based on PC platform over Windows NT. The PC will manage the receivers and antenna, and perform the ephemeris conversion to antenna tracking data. The ephemeris file (TLE or TBUS) will be received by the PC through the LAN connection. 4. Base band signal monitoring. The PC will collect receiver information during the satellite pass. 5. Testing capabilities. Out of satellite passes, the station have two testing loops one to verify the HRPT chain and the other to verify the LRPT chain. 6. Frequency and time generation and distribution. The GPS system will be in charge of providing NTP signal to the LAN, time data to the station for program tracking, and 10 MHz reference to the receivers and L-band to VHF converter. Next figure shows the RUS functional block diagram and its connections

8 Page 8 of 74 F&T IRIG B / NTP* 10 MHz 10 MHz HRPT signal L-band HRPT acquisition chain HRPT data & clock MetOp Satellite LRPT signal VHF-band LRPT acquisition chain LRPT data & clock FEP Test signals Testing MetOp tracking Local M&C Administrative Message RUS Figure 1. RUS Functional Block Diagram

9 Page 9 of FUNCTIONAL DESCRIPTION See RUS block diagram to support the explanation of the following paragraphs HRPT Reception The HRPT reception chain has the aim of the acquisition and demodulation of the HRPT Carrier coming from the MetOp satellite. The satellite program tracking function has to be activated in advance to the signal acquisition. The HRPT signal reception is based on a 2.4 meter L-band prime focus antenna, which will perform reception of the or 1707 MHz HRPT carrier. After reception the HRPT signal is amplified by the LNA, then it is down converted from L-band to the VHF band between 130 MHz and 160 MHz. Both the LNA and down converter are integrated in the antenna feed. Besides the U/C (VHF to L-band) used for testing is also integrated in the same area. The VHF signal is cabled to the indoor area of the station where is housed the HRPT receiver. The maximum distance between the Antenna and the receiver has to be less than 100 m. Then the signal is received by the VHF receiver where is down converted again to IF and demodulated by means of a digital I/Q demodulator, extracting the raw digital bits and associated clock. The data flow is Viterbi decoded and sent to FEP in less than 0.5 sec. after reception from the spacecraft. The HRPT downlink functional chain provides test inputs/outputs to inject/extract test signals in order to feed the testing function. The units of the HRPT functional chain will be connected to the Local monitoring and control system.

10 Page 10 of RF HRPT Main Characteristics Next table summarize the main RF parameter of the HRPT signal transmitted from the MetOp satellites. More details are given in AD-2. L-BAND DOWNLINK INTERFACE Table METOP HRPT LINK CHARACTERISTICS PARAMETER Signal Nominal Carrier Center Frequency RF bandwidth Polarisation Data Rate VALUE HRPT, High Resolution Picture Transmission Either MHz or MHz 4.5 MHz (99 % of the total signal power) RHCP 3.5 Mbps/ Mbps Data Modulation QPSK FEC 3/4 Satellite Axial Polarization Power Flux Density evolution during satellite pass < 4.5 db -154 dbw/m 2 4 khz to -133 dbw/m MHz Carrier Frequency Deviation ± º elevation and clear sky Ground Station axial ratio Pointing loss 6 db/k < 1 db < 0.5 db

11 Page 11 of LRPT Reception The LRPT functional chain will be responsible for acquiring and demodulating the VHF carrier at either or MHz emitted by the MetOp satellite. The LRPT downlink signal is received by a separated and fixed VHF cross dipole antenna then it is amplified by a LNA and sent to the LRPT VHF receiver. Inside the VHF receiver the signal is down converted to IF, filtered and demodulated by a digital I/Q demodulator, extracting the raw digital bits. The data flow is Viterbi decoded and sent to the FEP in less than 0.5 sec. after reception from the spacecraft. The maximum distance between the Antenna and the receiver will be 100 m. LRPT downlink functional chain provides test inputs/outputs to inject/extract test signals in order to feed the RF Monitoring function. The units of the LRPT functional chain will be connected to the Local monitoring and control system. HRPT and LRPT receiver are interchangeable RF LRPT Main Characteristics Next table summarizes the main RF parameter of the LRPT signal transmitted from the MetOp satellites. VHF-BAND DOWNLINK INTERFACE Table METOP LRPT LINK CHARACTERISTICS PARAMETER Signal Nominal Carrier Center Frequency Polarisation Data Rate Data Modulation Satellite Axial Polarization VALUE LRPT, Low Resolution Picture Transmission Either MHz or MHz RHCP 72 kbps/80 kbps QPSK FEC ½ interleaving with synchronisation markers insertion < 4.5 db Power Flux Density evolution during satellite pass See section Carrier Frequency Deviation ± G/T at clear sky Steerable YAGI antenna º elevation Omnidirectional antenna: º elevation

12 Page 12 of Power Flux Density evolution of HRPT and LRPT signals. The power flux density of the HPRT and LRPT signals transmitted during the MetOp passes have an evolution regarding the ground station antenna elevation as it is indicated in the next figures. LRPT PFD , , , G/S Elevation,º Figure 2. LRPT Power Flux Density HRPT PFD G/S Elevation,º Figure 3. HRPT Power Flux Density

13 Page 13 of Satellite Tracking The motor and drive system is based on the model Heavy Duty of DTP with a parabolic reflector of 2.4 meters. The antenna can be moved from 5º to 185º in elevation, and rotate 450º in azimuth. The tracking accuracy provided with the elevation over azimuth pedestal is better than 0.2º A Portable Maintenance Unit shall be deliver to control locally the antenna motors. The connection of this remote control unit disables all other automatic or manual control of the dish's motorisation. All parts related to the antenna pedestal are made in stainless steel avoiding any corrosion in the materials. The ephemeris file is received through the administration message interface. The LAN connection of the PC will be the via of passing the ephemeris information. The ephemeris file format is TLE or TBUS. It will be used for computing the antenna tracking file, which will allow to control the L-band antenna positions. The file is transferred to the tracking unit before the satellite pass. The RUS has not scheduler, as in CDA, it is capable of receiving TBUS data covering next 36 hours and using this information in the absence of the next ADMIN MESSAGE. The RUS can be operated in two principal modes: a. Remote mode b. Local mode Remote mode: The RUS is connected to FEP and the station is fully commanded from the admin message received without any operator intervention. The RUS PC manage to process the useful mission data and after satellite pass obsolete information is removed. This is the nominal operational mode. Local mode: The RUS is commanded by an operator in front of the PC screen and keyboard. This mode will be used for maintenance and testing. Tracking data is input by operator of MMI that allows station control HRPT and LRPT Distribution The output of each receiver (HRPT and LRPT) contains DATA(I+Q) and CLOCK (2x) unbalanced. Two Trompeter connectors are available by each receiver. Next table identifies the characteristics of the interface.

14 Page 14 of 74 Table HRPT AND LRPT ELECTRICAL INTERFACES TO FEP PARAMETER Max Frequency Interface Delay time between DATA and CLOCK Data Rate VALUE 10 MHz RS-422 differential TTL 5 ns HRPT: 3.5 Mbps LRPT: 72 Kbps Next figure indicates the connections and the signals to the FEP. HRPT RECEIVER DATA(I+Q) CLOCK (2x) FEP LRPT RECEIVER DATA(I+Q) CLOCK (2x) Test Subsystem Figure 4. HRPT AND LRPT INTERFACES TO FEP HRPT Testing Chain Two manual testing loop will be used in order to verify the HRPT chain. The long loop will be closed at antenna level, by means of a antenna probe which will allow to inject L-band signals into the reception chain. The short loop will be closed at the input of the demodulator. The testing chain is able to generate a previously recorded satellite data file which will be modulated by being injected into the demodulator. Selecting the long loop, the same signal at different frequency can be injected at antenna input. The testing signal could be set to a level which corresponds to the level obtained during the initial acquisition conditions. The file data is demodulated by the demodulator. Both files can be compared for detecting the quality of the signal. For making this test representative of the acquisition and reception conditions the antenna will be at 5º elevation. It is this condition where the BER is measured, that is, the C/N will correspond to that operational condition.

15 Page 15 of 74 All measurements made in the RUS station shall be dated with the time of performance in UTC. L-band Reception Antenna L-band to VHF converter HRPT RECEIVER data clock L-band LNA VHF to L-band converter TESTING UNIT Figure 5. HRPT TESTING CHAIN LRPT Testing Chain Same as HRPT testing chain. VHF-band Reception Antenna VHF-band LNA LRPT RECEIVER TESTING UNIT data clock Figure 6. HRPT TESTING CHAIN Frequency and Time Subsystem The T&F subsystem provides GPS based time and frequency reference for different equipment of RUS station. The reference time (IRIG B baseline) and frequency shall be distributed appropriately to the PSF RUS equipment. The reference time based on NTP shall be distributed to the LAN.

16 Page 16 of 74 GPS Antenna (Roof) Time Server NTP LAN IRIG-B NTP RUS FEP L-Band to VHF Downconverter Divider 10 MHz GPS Receiver NTP VHF to L-Band Test Upconverter 10 MHz 10 MHz 10 MHz HRPT VHF Receiver LRPT VHF Receiver TEST Unit LOCAL M&C ANTENNA INTER-SITE CABLES (100m. aprox.) EQUIPMENT ROOM Figure 7 : F&T S/S functional diagram The core of the T&F subsystem will consist of a GPS antenna and receiver that will provide 10 MHz frequency reference signals and IRIG B time code reference signals to the following equipment: 10 MHz frequency reference: HRPT VHF Receiver LRPT VHF Receiver Test Generator L-Band to VHF Converter and VHF/L-band test up converter ( only one cable will be used and a divider will drive both units) IRIG-B time reference: Network Time Server. The Network Time Server will provide time reference based on Network Time Protocol to the LAN

17 Page 17 of Local M&C Subsystem (LMCS) The Local M&C will perform the monitoring and control of the elements located in the RUS station via standard interfaces, RS-232/RS-422 selectable and a PC card for motorization. Next figure shows the M&C block diagram and connections. HRPT Receiver LRPT Receiver Tracking Unit GPS Receiver RS-232/ RS-422 RS-232/ RS-422 RS-232/ RS-422 RS-232 RUS PC Ethernet LAN FEP Figure 8. RUS M&C connections

18 Page 18 of BLOCK DIAGRAM The Detail Block Diagram for RUS is given in figure below. OUTDOOR UNIT INDOOR UNIT RECEIVER UNIT 10 MHz VHF-BAND LNA LRPT RECEIVER-2 Data(I+Q) Clock TEST UNIT clock 10 MHz OUTDOOR UNIT U/C L-band to VHF TEST MODULATOR/ BER data FEPs RECEIVER UNIT clock 10 MHz L-BAND D/C L-band to VHF HRPT RECEIVER-1 Data(I+Q) Clock LNA EL/AZ ENCODER MOTOR TRACKING UNIT LIMITS OUTDOOR UNIT PC LOCAL MONITORING AND CONTROL Adm. Message/ LAN NTP 10 MHz GPS RECEIVER IRIG B NETWORK TIME SERVER NTP LAN Figure 9. RUS Block Diagram

19 Page 19 of UNITS DESCRIPTION HRPT Chain Antenna and Motorization The antenna chosen for the HRPT signal is an L-band receive only antenna. It consists of a 2.4 dish on a tripod pedestal with AZ and EL motors. The tracking is performed by program tracking. The motorization is based on a Heavy Duty motorization. This provides 190º degrees of freedom in elevation and 450º degrees of freedom in Azimuth. The accuracy of the encoders is better than 0.02º and the tracking accuracy is better than 0.2º. The motorization units are fabricated in stainless steel and are in compliance with the corrosion and safety specifications. Final customer must provide an earth connection at the basis of the antenna. 1.8m 2.4m Dish motorisation Azimuth motor Azimuth optical encoder + switches Elevation motor Elevation optical encoder + switches Tracking Unit PWM Amplifier PWM Generator Sensors interface RUS PC Automatically download TLE files from the internet on NORAD Web, Automically calculate the next pass with a 5 minimum elevation, Display the angles during Stand-By and Tracking, Display the errors, Store the Logs. Connexion of this element disables all other automatic or manual controll of the dish s motorisation. (For security reasons) Remote control Figure 10. L-BAND ANTENNA DRIVE BLOCK DIAGRAM

20 Page 20 of 74 The tracking unit receives through the PC interface card the antenna pointing data file (time, azimuth, elevation) with data, each second. The time reference is used to accurately start and program track the satellite. The antenna controller is designed by using well known servo control techniques like the PID controller (P:proportional, I: integral and D: derivative) which assures a correct antenna pointing and tracking of the satellite. The motors are DC type with a control which is provided by the PWM. The PWM amplifiers are protected against short circuit, overload etc. The optical encoders permits to obtain enough accuracy (24000 points per turn), and they located directly on the antenna axis. The maximum encoder error is lower than 0.02º, and the tracking is 0.2º with the antenna is at maximum velocity. Limits determine the range of movement in axis, 190º in elevation and 450º in azimuth. The motors are stopped by making a short circuit in the inductors of the motors. There is one motor per axis. The antenna will be stopped in case of motor failure. The Antenna positioner proposed for the RUS is the conventional elevation over azimuth type. When a quasi zenithal pass has to be tracked, for elevations above 87 degrees the satellite is tracked by using the elevation in 180º mode. The signal loss due to the misspointing of the satellite for this case is about 0.5 db that is compensate by 3dB higher zenith w.r.t 5º elevation From the PC is possible to issue a command to set the antenna in maintenance. This command avoid to operate the antenna from remote when a local maintenance activity is in progress in the antenna area. Next table summarizes the main characteristics of the drive system.

21 Page 21 of 74 Table L-BAND ANTENNA DRIVE AND MECHANICAL CHARACTERISTICS DRIVE SYSTEM CHARACTERISTICS Azimuth Travel 450 Elevation travel 5º to 185º Azimuth speed Elevation speed < 20 /s < 8 /s Tracking Accuracy < 0,1 Encoder accuracy < 0.02º Reflector structure Pedestal Aluminum Stainless steel Weight 200 Kg without supporting structure Finish Stainless steel /hot dip galvanized Foundation size 3.5 m 2 Roof load 750 kg/m 2 Operational winds <= 200Km/h in stow mode <= 170Km/h in other case Ambient temperature Operational: -30 to 55ºC Consumption Survival 220 V AC 12 A L-band LNA The LNA is package in a weatherproof enclosure for outdoor applications and is located at the antenna feed. The preamplifier consists of two stages as well as a helicoidal type band pass filter. The first stage is based on a low noise HEMT transistor with adapted impedance by means of a LC circuit. Then the filter provides a good attenuation of the out of band frequencies and an amplifier permits to drive the antenna down lead cable to the down converter located in the equipment room.

22 Page 22 of 74 from L-band antenna BPF 1700+/-20 MHz To L-band/VHF Converter L-band LNA Amplifier Figure 11. L-BAND PRE-AMPLIFIER L-band/VHF band Down converter The L-band to VHF-band down converter It consists of an L-band amplifier, a band pass filter, a mixer with a local oscillator working at 1560 MHz, and a VHF amplifier. The input amplifier allows to have enough power level, after the filter allows to rejects image frequencies and spurious. The local oscillator is driven by a external 10 MHz reference frequency for being able to provide an accurate conversion frequency and low phase noise. The input and output impedances are of 50 ohms. L-band input BPF 1700 MHz +/- 20 MHz VHF output Amplifier LO=156x Ref Freq. 10 MHz input Figure 12. L-BAND TO VHF FREQUENCY CONVERTER The LNA and the downconverter form an assembly which main characteristics are the following:

23 Page 23 of 74 Table LNA and DC assembly characteristics LNA AND DC ASSEMBLY CHARACTERISTICS Noise Factor 0.6 db Gain 45 db Center frequency 1700 MHz Bandwidth +-10 MHz at 3 db Local oscillator 1557 MHz Oscillator drift <30 KHz Output impedance 500 ohms Output connector N type Operational temperature -20ºC to +60ºC VHF Receiver The reception frequency band is limited between 130 to 160 MHz and the input impedance is 50 ohms. The receiver has a 45 db AGC with minimum range of 80 dbm. A first stage compensates the antenna cable losses and adjusts the level at the receiver input. An input filter permits to eliminate the undesirable frequencies and limit the input noise to the receiver The tuner of the receiver can be set to different frequency, and it translates the VHF signal into low IF signal ( 36.7 MHz for HRPT and 38.9 MHz frequency for LRPT) as well as an automatic control of the gain and frequency. The CPU controls the frequency of the tuner, it also has a Doppler file (sent by the PC) that permits a verification and a correction of the MetOp signal. This measurement can be storage in a log file in the PC. The CPU also selects the pass band of the filters (SAW) and then permits the receiver to be compatible with either LRPT or HRPT signals. The I/Q demodulation is digital and involves a clock signal recovery. In case of signal loss, a clock signal can maintain de rhythm of the signal to avoid losses in the acquisition system. The outputs are numerically filtered and Viterbi decoded, then they are available for the acquisition card of the FEP.

24 Page 24 of 74 BPF MHz AGC SAW fliter I/Q Demodulator Digital Filter Output Drive data(i+q) clock (2x) LO Viterbi decoder CPU Serial Interface 10 Mhz Ref input RECEIVER Figure 13. VHF RECEIVER BLOCK DIAGRAM LRPT Chain VHF Antenna The cross dipole antenna has a gain of about 16 db/iso. The cross dipole antenna can guarantee good quality reception from 5º elevation if there are no local interferences, if we have no local noise problem. This is a very important point that has to be confirmed by the site provider. INDRA assumes that no local interferences/noise exist at site installation. The antenna output will be directed to a VHF enclosure containing a band pass filter and the low noise amplifier.

25 Page 25 of 74 Figure 14. VHF ANTENNA DIAGRAM VHF LNA The signal is filtered to avoid the parasite signals then it is amplified by a dual stage low noise amplifier with a noise figure of 1 db VHF Receiver Similar to the HRPT chain. In this case the IF frequency will be 38.9 MHz.

26 Page 26 of Test S/S Test Transmitter A test transmitter unit allows to verify the right operation of the system out of satellite passes. It permits to inject, at antenna level (L-band or VHF) a test signal of the chain. A second level of tests is foreseen at IF, close to the receptors, that permits to test the I/Q demodulation injecting data directly in I/Q modulator. For the signal to noise test, the antenna will be directed to a noise source (sun) to perform the verifications.

27 Page 27 of 74 Test transmitter L band antenna L band test signal L band synthetizer VHF band antenna 10 MHZ reference clock VHF test signal VHF synthetizer 10 MHZ reference clock IF test signal IF output Baseband synthetizer I/Q modulator Pattern Clock HRPT/LRP T 10 MHz reference clock Pattern Generator Test Interface Board Figure 15 TEST TRANSMITTER Frequency and Time S/S GPS Receiver The GPS receiver provides the time and frequency references that will be distributed to the equipment of the station. A GPS antenna, (to be placed on a mast on the roof and in a location such that it has a good visibility from the sky), receives the signals from the GPS constellation. These signals are fed to the receiver itself (located in a rack inside the operations room) by means of a 80 meter approx. (length to be defined) antenna down lead

28 Page 28 of 74 cable. The receiver extracts the information from the GPS satellite signals and generates the IRIG-B signals Additionally, the receiver contains a high stability quartz oscillator OCXO that provides the 10 MHz reference to the equipment that need an external reference. This reference is locked to the GPS reference to provide long-term stability. The receiver is manufactured by RAPCO and has the following specifications: GPS RECEIVER CHARACTERISTICS FREQUENCY REFERENCE CHARACTERISTICS Reference frequency 10 MHz Long Term Stability < /day GPS locked <3x10-10 /day GPS unlocked Short Term Stability <1x10E-11 for T = 0.1 to 30 secs Side bands: Harmonics Non-harmonics < -40 dbc < -70 dbc Impedance 50 ohms Nominal Level 1 V rms ( 13 dbm) Connector BNC-female Phase Noise Freq. Offset dbc/hz 1Hz Hz Hz KHz KHz -145 Number of outputs 4 TIME CODE REFERENCE CHARACTERISTICS Time Code IRIG B Carrier Frequency 1 KHz Impedance 100 ohms Level 4 V peak-to-peak into 10 Kohms Modulation Index 3:1 Connectors BNC-female Number of outputs 2 Accuracy ±300 nanosec. to UTC

29 Page 29 of 74 MECHANICAL CHARACTERISTICS Dimensions Remote M&C interface Front panel indicators 1U x 19 rack mount RS-232 protocol, D-sub-9 connector + dry contact alarm output AC power On DC power On GPS status Control status Outputs valid Antenna fault Alamrs (2 outputs) Receiver Environment Operating: Temperature range: 0 to 50ºC Aerial Assembly Environment Antenna Interface Relative Humidity: 90% non-condensing Operating: Temperature range: -40 to +70ºC N(f) on rear panel, L1 input, +5V output AC Supply 220 / 230 / 240 V ± 10 % Relative Humidity: 100% non-condensing 45 to 66 Hz frequency

30 Page 30 of NETWORK TIME SERVER This unit provides a time signal in the LAN using the NTP protocol. The time reference it provides is obtained from an IRIG-B output of the GPS Receiver. The Network Time Server is manufactured by Datum and has the following characteristics: NETWORK TIME SERVER Outputs: Time code IRIG-B, Modulated 3:1, 3 Vpp, 75ohm, BNC 1 pps TTL, 50 ohm, BNC Frequency Inputs: 10 MHz, 50 ohm; BNC Time code IRIG-B, 500mV to 10 Vpp, >10Kohms, BNC or DB-9 1 pps TTL, ACtive rising or falling, HD-15 GPS Input/Output: Network Serial port A Serial port B Timing Accuracy Power Requirements Dimensions Antenna/pream., SMA RJ-45 / 10BaseT Ethernet RS-232/DB-9 DTE RS-232/DB-9 DCE < 5 microsec, relative to IRIG-B code 95 to 265 VAC, 47 to 63 Hz, 20 W Height: 1 U Width: 19 Depth: 12 Environmental Temperature: 0 to 50ºC Weight Relative humidity: 0 to 95%, noncondensing < 4.5 Kg

31 Page 31 of RUS PHYSICAL DESCRIPTION The RUS station equipment is located in two well defined sites: The roof of the Eumetsat headquarters and the equipment room inside the building. Three antennas will be mounted on the roof, the L-Band HRPT antenna, the VHF cross dipole LRPT antenna and the GPS antenna. The L-band antenna is based on a 2.4m dish with azimuth and elevation motors. The antenna shall be ground-based but not penetrating. The LNA, the L-band to VHF converter and the VHF to L-band test converter are located at the feed of this antenna. Furthermore, an antenna probe is located at the antenna feed for testing purposes. The outdoor signals connected to this antenna are: VHF band output, VHF band test input, 10 MHz frequency reference, power and drive signals for the antenna motorization. The VHF antenna is a cross dipole one. The VHF LNA and the Test probe are located on the antenna mast. Two cables are connected to this antenna, the cable driving the VHF output to the VHF receiver and the cable driving the VHF test input from the test generator. The GPS antenna is placed on a mast on the roof. The received GPS signals are fed to the receiver (located indoor) by means of an antenna down lead cable. The indoor unit consists of a 24 U rack where the indoor equipment is placed and a table for the PC screen and the keyboard. The length of the intersite cables will be 100 meters maximum.

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33 Page 33 of 74 L-BAND HRPT ANTENNA L-band output cable L-band test input cable 10 MHz Ref. cable L-band feed, including LNA, D/C, U/C Test probe Cross Dipole VHF antenna VHF LNA VHF CROSS DIPOLE LRPT ANTENNA OUTDOOR SIGNALS INDOOR SIGNALS L-BAND HRPT SIGNALS: - VHF-BAND OUTPUT TO HRPT RECEIVER Cables: VHF output Test Input - VHF-BAND TEST FROM TEST UNIT - 10 MHz FROM GPS L-BAND HRPT ANTENNA SIGNALS: - POWER (PWR) FROM TRACKING UNIT - DRIVE SIGNALS (SIG) FROM TRACKING UNIT GPS SIGNAL TO GPS UNIT El limits Elevation Encoder VHF LRPT SIGNALS: - VHF-BAND OUTPUT TO LRPT RECEIVER - VHF-BAND TEST FROM TEST UNIT Elevation motor Az limits GPS Antenna Azimuth encoder EL-S EL-P Azimuth motor GPS ANTENNA AZ-S AZ-P Distribution Box GPS signal SIG PWR Connectors: AZ-S, azimuth power AZ-P, azimuth signal EL-P, elevation power EL-S, elevation signal SIG, signal PWR, power RC, antenna local control HRPT RECEIVER INDOOR UNIT LRPT RECEIVER TRACKING UNIT PC Screen and Key Board TEST UNIT Test Unit LRPT Receiver COMPUTER HRPT Receiver NTS GPS NTS GPS Receiver Personal Computer Tracking Unit Figure 16 RUS Physical Diagram supplied and shall not be copied or given to any person or organization without written authorization from the owner.

34 Page 34 of Dimensions Indoor equipment: GPS Receiver (Height x Width x Depth): 1U x 19 x 350 mm (TBC) Network Time Server 1U x 19'' x 12'' Tracking unit (H x W ): 2U x 19 VHF Receiver for HRPT (H x W ): 2U x 19 Test Generator (H x W ): 3U x 19 RUS PC (H x W ): 4U x 19'' PC Monitor: (TBD) VHF Receiver for LRPT (H x W ): 2U x 19'' Outdoor equipment: GPS antenna L-band HRPT antenna: VHF LRPT antenna: Location GPS Receiver: rack mounted in operations room Network Time Server: rack mounted in operations room Tracking Unit: rack mounted in operations room VHF Receivers for HRPT/LRPT: rack mounted in operations room Test Generator: rack mounted in operations room RUS PC: rack mounted in operations room PC Monitor: on a table in operations room (TBC) GPS Antenna: on a mast on the roof with good visibility from sky L-band LNA: at the feed of the L-band antenna L-band to VHF converter: at the L-band antenna feed Test upconverter: at the L-band antenna feed VHF LNA: at the VHF antenna.

35 Page 35 of INTERFACE DESCRIPTION 3.1 EXTERNAL INTERFACES The RUS external interfaces are: MetOp satellite which transmits to RUS both HRPT carrier (L-band) and LRPT carrier (VHF-band). Front End Processor (FEP). The RUS has to send MetOp HRPT CADUs, MetOp LRPT CADUs and Reference Time to FEP. The RUS has to receive Admin Messages with information for acquisition and antenna pointing. The above interfaces are indicated in the next drawing: GPS System REFERENCE TIME MetOp Satellite METOP HRPT CARRIER METOP LRPT CARRIER HRPT functional chain LRPT functional chain HRPT CADU's LRPT CADU's FEP MetOp Satellite Tracking ADMIN MESSAGE FOR SATELLITE ACQUISITION RUS Station Site Power Internet Access Figura 17: RUS External Interfaces Block Diagram.

36 Page 36 of HRPT data to FEP interface The HRPT functional chain provides to the FEP the 3.5 Mbps HRPT data bit stream and associated clock in the following way: Data(I+Q)+ Clock at TTL level A Trompeter connector is available at receiver's side LRPT data to FEP interface The LRPT functional chain provides to the FEP the 72 Kbps serial bit stream data and associated clock in the following way: Data(I+Q) + Clock at TTL level A Trompeter connector is available at receiver's side Reference Time The reference time signal that the GPS System provides to the FEP is based on NTP protocol. The Network Time Server provides NTP based reference time to the LAN MetOp HRPT Carrier MetOp LRPT Carrier Site Installation aspect shall be defined by the supplier in agreement with the customers INTERNET Internet access could be available POWER SUPPLY Power supply needs shall be defined by the supplier.

37 Page 37 of M&C INTERFACES The LMCS is linked with the units of RUS by means of different RS232 links. The interface with the FEP will be Ethernet type. The tracking unit is linked to the PC by a dedicated board. The PC is used for the man machine interface and also for the storage of the different log files of all the elements of the system. 3.3 ADMIN MESSAGE INTERFACE Table Format of he Admin message Administrative Message extracted from ISP Application data Description Type Size (Bytes) 1 Message Number (incremented number used as rolling counter) 1 character 1 byte 2 Starting Time of Validity for this Admin Message. [MJD 2000] 1 long + 2 unsigned long 12 bytes 3 METOP Satellite ID (International Designator) (10 ASCII characters) 10 characters [ASCII] 10 bytes 4 METOP Time Correlation (two parameters) 2 double 16 bytes 5 METOP TBUS Orbital parameters for first 12 hours a) Validity Starting time [MJD 2000] b) TBUS part IV (without spacecraft ID) 6 METOP TBUS Orbital parameters for hours 13 to 24 a) Validity Starting time [MJD 2000] b) TBUS part IV (without spacecraft ID) 7 METOP TBUS Orbital parameters for hours 25 to 36 a) Validity Starting time [MJD 2000] b) TBUS part IV (without spacecraft ID) 8 METOP SPOT-model Orbital parameters for first 12 hours a) Validity Starting time [MJD 2000] b) 12 SPOT parameters binary coded 9 METOP SPOT-model Orbital parameters for hours 13 to 24 a) Validity Starting time [MJD 2000] b) 12 SPOT parameters binary coded 10 METOP SPOT-model Orbital parameters for hours 25 to 36 b) Validity Starting time [MJD 2000] (a) 1 long + 2 unsigned long (b) Characters [ASCII] (a) 1 long + 2 unsigned long (b) Characters [ASCII] (a) 1 long + 2 unsigned long (b) Characters [ASCII] (a) 1 long + 2 unsigned long (b) 13 double (a) 1 long + 2 unsigned long (b) 13 double (a) 1 long + 2 unsigned long (b) 13 double 515 bytes (a) 12 bytes (b) 503 bytes 515 bytes (a) 12 bytes (b) 503 bytes 515 bytes (a) 12 bytes (b) 503 bytes 116 bytes (a) 12 bytes (b) 104 bytes 116 bytes (a) 12 bytes (b) 104 bytes 116 bytes (a) 12 bytes (b) 104 bytes b) 12 SPOT parameters binary coded 11 METOP Calibration parameters (50 parameters) (Roughly estimated to 5 parameters for 10 instruments) 50 double 400 bytes 12 METOP Compression parameters (Number of on-board used compression table) 20 unsigned short 40 bytes

38 Page 38 of METOP Events and messages (rolling buffer) (each event shall be preceded by an event serial number) (i.e. warning for manoeuvre, Instrument events) unsigned short [ASCII] 5200 bytes 14 NOAA Satellite ID (International Designator) (10 ASCII characters) 10 unsigned short [ASCII] 10 bytes 15 NOAA S/C SPOT-model for first 12 hours 116 bytes a) Validity Starting time [MJD 2000] (a) 1 long + 2 unsigned long (a) 12 bytes b) 12 SPOT parameters binary coded (b) 13 double (b) NOAA S/C SPOT-model for hours 13 to 24 a) Validity Starting time [MJD 2000] b) 12 SPOT parameters binary coded 17 NOAA S/C SPOT-model for hours 25 to 36 a) Validity Starting time [MJD 2000] b) 12 SPOT parameters binary coded (a) 1 long + 2 unsigned long (b) 13 double (a) 1 long + 2 unsigned long (b) 13 double bytes 116 bytes (a) 12 bytes (b) 104 bytes 116 bytes (a) 12 bytes (b) 104 bytes 18 Spare 70 bytes Total : 8000 bytes FEP/RUS will extract from this message the relevant information for PSF/RUS PSF/RUS will then receive an Admin msg once per pass. PSF/RUS may use either TBUS orbital parameters or SPOT orbital parameters The base line is the use of Metop TBUS orbital parameters for 36 hours (nb 5 to 7 of above table) leading to a size of the file (without header) of 1545 bytes Structure of Admin msg is presented below Table Admin Msg structure for PFS/RUS TBUS Admin Msg for PSF/RUS Description Type Size (bytes) 1 Message Number (incremented number used as rolling counter) 1 character 1 byte 2 Starting Time of Validity for this Admin Message. [MJD 2000] 1 long + 2 unsigned long 12 bytes 3 METOP Satellite ID (International Designator) (10 ASCII characters) 10 characters [ASCII] 10 bytes 4 METOP Time Correlation (two parameters) 2 double 16 bytes 5 METOP TBUS Orbital parameters for first 12 hours 1. Validity Starting time [MJD 2000] 2. TBUS part IV (without spacecraft ID) 6 METOP TBUS Orbital parameters for hours 13 to Validity Starting time [MJD 2000] 2. TBUS part IV (without spacecraft ID) (1) 1 long + 2 unsigned long (2) Characters [ASCII] (1) 1 long + 2 unsigned long (2) Characters [ASCII] 515 bytes (1) 12 bytes (2)503 bytes 515 bytes (1) 12 bytes (2)503 bytes

39 Page 39 of 74 7 METOP TBUS Orbital parameters for hours 25 to Validity Starting time [MJD 2000] 2. TBUS part IV (without spacecraft ID) (1) 1 long + 2 unsigned long (2) Characters [ASCII] 515 bytes (1) 12 bytes (2)503 bytes Or SPOT Admin Msg for PSF/RUS Description Type Size (bytes) 1 Message Number (incremented number used as rolling counter) 1 character 1 byte 2 Starting Time of Validity for this Admin Message. [MJD 2000] 1 long + 2 unsigned long 12 bytes 3 METOP Satellite ID (International Designator) (10 ASCII characters) 10 characters [ASCII] 10 bytes 4 METOP Time Correlation (two parameters) 2 double 16 bytes 8 METOP SPOT-model Orbital parameters for first 12 hours c) Validity Starting time [MJD 2000] SPOT parameters binary coded 9 METOP SPOT-model Orbital parameters for hours 13 to 24 c) Validity Starting time [MJD 2000] b) 12 SPOT parameters binary coded 10 METOP SPOT-model Orbital parameters for hours 25 to 36 d) Validity Starting time [MJD 2000] b) 12 SPOT parameters binary coded (a) 1 long + 2 unsigned long (b) 13 double (a) 1 long + 2 unsigned long (b) 13 double (a) 1 long + 2 unsigned long (b) 13 double 116 bytes (a) 12 bytes (b) 104 bytes 116 bytes (a) 12 bytes (b) 104 bytes 116 bytes (a) 12 bytes (b) 104 bytes

40 Page 40 of RUS COMPONENTS HRPT CHAIN LRPT CHAIN TRACKING M&C F&T SUBSYSTEM OUTDOOR 2.4 m diameter L-band antenna L-band LNA L-band/VHF downconverter Outdoor-indoor cable Portable Maintenance Unit INDOOR HRPT Receiver (identical to the LRPT receiver) OUTDOOR Cross dipole antenna and mast VHF LNA Outdoor-indoor cable INDOOR LRPT Receiver (identical to the HRPT receiver) OUTDOOR L-band pedestal Motors Azimuth and Elevation Encoders Azimuth and Elevation Limits Azimuth and Elevation Outdoor-indoor cable signal and power INDOOR Tracking unit PC with Windows NT (indoor) GPS antenna (outdoor) GPS cable GPS Receiver (4 10 MHz outputs and IRIG B), indoor Network Time Server, indoor

41 Page 41 of 74 TESTING OTHER L-band test probe (outdoor) VHF-band test probe (outdoor) Test U/C (outdoor) Test Generator (indoor) RACK, cables etc.

42 Page 42 of ANALYSIS 5.1 G/T L-BAND G/T ANALYSIS PARAMETERS DATA DIMENSIONS Antenna Diameter 2.4 Meters Frequency 1707 MHz Antenna Efficiency 0.55 % /100 Antenna Noise 5 deg EL 80 K Ant out-lna input losses 0.2 db VSWR 1:1.25 LNB Noise Factor 0.6 db Calculated Gain db System Noise Temperature 142 K G/T 8.1 db/k G/T REQUIRED 6 db/k Margin 2.1 db

43 Page 43 of 74 VHF BAND G/T ANALYSIS PARAMETERS DIMENSIONS DATA Frequency (MHz) 137,90 S/C altitude (Km) 850,00 Slant range (Km) 2.888,79 S/C view angle (degree) 61,51 Data rate (kb/s) 72 G/S view angle (degree) 5, S/C EIRP (dbw) 8,00 S/C antenna axial ratio (db) 4,50 Free space loss (db) 144,46 Atmospherie loss (db) 0,00 Polarisation loss (db) 0,47 Reflection & multipath (db) 2,00 Total propagation loss (db) 146,93 Ground station G/T (reference) (db/k) -24,40 G/T Required (db/k) Margin -2

44 Page 44 of BER HRPT Downlink DOWNLINK BUDGET CALCULATION WORST NOM FREQUENCY (MHz) IPFD (dbw/m^2) -131,1-128,12 G/T (db/k) 6 6 C/No (dbhz) 77,41 80,39 TELEMETRY RECOVERY MODULATION LOSS (db) -1,00-1 DEMODULATION LOSS 3,00 3,00 (db) BIT RATE(bps) , ,00 BIT RATE( dbhz) 65,44 65,44 Eb/No 7,96 10,94 REQUIRED Eb/No (db) 5 5 MARGIN(dB) 3,96 6,94

45 Page 45 of LRPT Downlink DOWNLINK BUDGET CALCULATION WORST NOM FREQUENCY (MHz) 137, ,9125 IPFD (dbw/m^2) -130,06-126,37 G/T (db/k) -24,4-24,4 C/No (dbhz) 69,90 73,59 TELEMETRY RECOVERY MODULATION LOSS (db) -1,00-1 DEMODULATION LOSS (db) 3,00 3,00 BIT RATE(bps) 72000, ,00 BIT RATE( dbhz) 48,57 48,57 Eb/No 17,32 21,01 REQUIRED Eb/No (db) 4,5 4,5 MARGIN(dB) 13,82 17,51

46 Page 46 of SIGNAL LEVEL HRPT METOP DOWNLINK CHARACTERISTICS MIN. LEVELS AT 62º MAX. LEVELS AT 0º EIRP min 39,1 dbm 31,46 dbm Frequency 1707 mhz 1707 mhz Range 2889 km 850 km Path Loss 166,36 db 155,73 db Polarization Loss 0,13 db 0,13 db Modulation Loss 1,00 db 1,00 db Total Loss 167,49 db 156,86 db Gain Min 27 db 27 db Received Level -101,39 dbm -98,40 dbm COMPONENTS GAIN/LOS S LEVEL GAIN/LOSS LEVEL db dbm db dbm Feed Losses -0,75-0,75 Losses -0,8-0,8 RF Test In -102,94-99,95 LNA+D/C ,94-59,95 Cable -5,50-5,50 Receiver input -63,44-65,45

47 Page 47 of 74 LRPT METOP DOWNLINK CHARACTERISTICS MIN. LEVELS AT 62º MAX. LEVELS AT 0º EIRP min 38 dbm 33,21 dbm Frequency 137,9125 mhz 137,9125 mhz RANGE 2889 km 850 km Path Loss 144,51 db 133,88 db Polarization Loss 0,45 db 0,45 db Modulation Loss 1,00 db 1,00 db Total Loss 145,96 db 135,33 db Gain Min 0 db 0 db Received Level -107,96 dbm -102,12 dbm COMPONENTS GAIN/LOS S LEVEL GAIN/LOSS LEVEL db dbm db dbm Feed Losses -0,75-0,75 Losses -0,8-0,8 RF Test In -109,51-103,67 LNA S/S ,51-63,67 Cable -5,50-5,50 Receiver input -75,01-69,17

48 Page 48 of MMI SPECIFICATIONS The MMI is an application named dttrack that runs in the PC on Windows NT. 6.1 GRAPHIC USER INTERFACE A fully graphic interface is available. It shows different information levels such as maps, station block diagrams, etc. Some examples are shown in next figure: Figura 18 Graphic User Interface Example

49 Page 49 of SET UP The set up page is divided into four sections 1. Choose satellitewith drag and drop: this allows to select the active satellite or satellites 2. Pass generator: it shows the passes of the selected satellite for a selectable day with date/time, dir, longitud and duration (sec). It comes from the ephemeris file. 3. Choose file paths: it shows: a. Path for satellite orbital element files b. Paths to satellite picture files c. Path for results files 4. My location details: it shows the details of the selectable location. An example of the setup screen is showed in the figure below.

50 Page 50 of 74 Figura 19 Set up page in MMI

51 Page 51 of WORLD MAP This screen shows the swath of the selected satellite(s) in a world map. It displays also the sun and moon positions, the date/time and the details on the location. Also it shows the current sattus of the station as well as the time until the next pass. An example of this is shown in the figure below: Figura 20 World map page in MMI

52 Page 52 of STATION MIMIC The 'Station Mimic' will present the information and block diagram of figure Figura 21 Station Mimic Block Diagram Monitoring function: The monitoring function will consist of: 1. The following equipments will change of color depending on their status: Green active or OK Red alarm These equipments are: LRPT LNA LRPT Receiver

53 Page 53 of 74 TEST unit TEST U/C HRPT LNA D/C HRPT Receiver Tracking unit GPS Receiver Network Time Server 2. The two possible positions of the two switches will be showed and could be selected: Position 1 Position 2 3. Several equipments will show their monitoring parameters. This information could be showed in the block diagram (see figure 4.3-1) or by an auxiliar window that appears when click on the equipment representation box. The following parameters are shown as an example of possible ones depending on the manufacturer specifications of each device:

54 Page 54 of 74 EQUIPMENT LRPT Receiver HRPT Receiver TEST MOD/BER unit Antenna position MONITORING PARAMETER Frequency Signal level Demodulator lock/unlock Power ON/OFF BER estimation Frame synchronizer lock/unlock Frequency Signal level Demodulator lock/unlock Power ON/OFF BER estimation Frame synchronizer lock/unlock BER counter BER ready Carrier loop ON/OFF Carrier frequency Output Power (dbm) Eb/No Azimuth Elevation Antenna Interlock Status

55 Page 55 of Control function The control function will be carried out from the buttons on the right side of the figure The control parameters will be shown when click on the buttons. These are: 1. Mode: The mode of the station can be displayed and controlled by the operator that will be able to select between local or remote: a. Local: when the station receives the ADMIN MESSAGE from a floppy disk or manual input. It disables the sending of data from the FEP. b. Remote: when the ADMIN MESSAGE comes from the FEP 2. Operational mode: The Operational mode of the station can be displayed and controlled by the operator when the button is clicked. The operator will be able to select between: Operational: default mode, it is the nominal one Test: when the tests are executed, the station is in the 'Test mode'. 'Test mode' finishes when no more tests are selected Maintenance: this status is declared by the local operator when the sattion is under full control of local operator. 3. Tests: a. Test command: when this button is clicked an auxiliar window will be displayed showing the parameters related to the control parameters of the Test unit and the position of the switches that will indicate a short or long loop test. A short or long test could be selected in either LRPT or HRPT chain. The following table is an example of these control parameters:

56 Page 56 of 74 EQUIPMENT CONTROL PARAMETER DESCRIPTION SW-01 Position 1 Select Short LRPT Test SW-01 Position 2 Select Long LRPT Test SW-02 Position 1 Select Long HRPT Test SW-02 Position 2 Select Short HRPT Test TEST MOD/BER unit Reset BER counter TEST MOD/BER unit Carrier Loop ON/OFF TEST MOD/BER unit Set carrier frequency TEST MOD/BER unit Set output power It will be able to select a value of each parameter inside a range, avoiding the input of values out of range. b. Test Results: when this button is clicked an auxiliar window will be displayed. It will show the results of the long/short loop test on the LRPT/HRPT chain, the BER counter and the success or failure of the test. 4. METOP Passes a. Scheduled Passes: when this button is clicked an auxiliar window is displayed where the list (in chronological order) of programmed (previously sent by the FEP in the ADMIN MESSAGE) passes is shown (passes can be viewed, deleted and printed) b. Pointing Data: when this button is clicked an auxiliar window is displayed, showing the results of the calculation of the satellite pointing data extracted from the ADMIN MESSAGE. c. Passes Status: when this button is clicked an auxiliar window is displayed. This window has to show the following data extracted from the ADMIN MESSAGE: PAST PASS ID:XXXXX TIME (from the last pass) NEXT PASS ID:YYYYY TIME (count down until the next pass) The next pass will be the current pass when the time reaches 0

57 Page 57 of Operator messages In the bottom side of the figure there is an operator messages list window showing the last events (alarms, commands...) and the time that occurred Date and time Current date and time will be display in a status bar in the bottom of the figure

58 Page 58 of LogBook See figure Figura 22 LogBook The LogBook contains all the operator list messages and permit the access to all the events stoled during application run. This LogBook could be printed and it would be possible to search items by date, name, etc.