EGNOS GEO Transponder Service Replenishment

Transcription

1 EUROPEAN COMMISSION DIRECTORATE-GENERAL FOR ENERGY AND TRANSPORT DIRECTORATE G - Maritime transport, Galileo & Intelligent transport G.3 - EU satellite navigation programmes: Infrastructure, Deployment and Exploitation EGNOS GEO Transponder Service Replenishment Annex 1 to Statement of Work Technical Specifications Commission européenne, B-1049 Bruxelles / Europese Commissie, B-1049 Brussel - Belgium. Telephone: (32-2)

2 TABLE OF CONTENTS TABLE OF CONTENTS...2 TABLE OF FIGURES DOCUMENTATION Applicable Documents Reference Documents Acronyms Definitions INTRODUCTION TO TECHNICAL SPECIFICATIONS EGNOS GEO TRANSPONDER SERVICE OVERVIEW EGNOS System Architecture EGNOS GEO Transponder Service Framework NLES Description EGNOS GEO TRANSPONDER SERVICE REQUIREMENTS EGNOS GEO Transponder Service General Requirements EGNOS Payload Requirements Functional Requirements Performance Requirements EGNOS Payload Reliability Requirements EGNOS Payload Operational Requirements NLES Hosting Sites and Operations Hosting Sites Requirements NLES RF Services Performances Requirements NLES Operations Requirements NLES Operations Requirements EGNOS GEO TRANSPONDER SERVICE PERFORMANCES INDICATORS...22 TABLE OF FIGURES Figure 1 : EGNOS GEO Transponder Service Contract Boundaries... 9 Figure 2 ECAC Region Coverage FIR Figure 3 Maximum EIRP spectral density limitations

3 Figure 4 Constraints on NLES Primary RF Characteristics Dimensioning

4 1. DOCUMENTATION 1.1. Applicable Documents [AD 1] EGNOS SIS Specifications, ICAO, SARPS, Annex 10, Vol. 1 [AD 2] EGNOS NLES-Hosting Site IRD EGN-ATMG-AIV-DRD204/0002, Issue 3, Rev. D [AD 3] Annex A NLES-Hosting Site IRD EGN-ASPI-NLES-DRD204/0001, Issue 1, Rev. E [AD 4] DCN to Annex A of the NLES Hosting Site IRD: Migration to Inmarsat 4 Ref: N [AD 5] Galileo Open Service Signal In Space ICD, Draft Reference Documents [RD 1] EGNOS GEO Transponder Service Replenishment Statement of Work, Issue 1.0 [RD 2] SBAS L1/L5 Draft ICD, EUROCAE, Draft version 3, June 2008 [RD 3] EGNOS Mission Requirements, Issue 2.0 [RD 4] ECSS Standards for Project Management (M- Series) 1.3. Acronyms ALC CCF CFI CPF ECAC EGNOS EGS EGSP EIRP ERP ESA FGM FIR GEO GNSS GPS ICAO I/F ICD IRD KPI MCC MTBF NLES NSGU RF Automatic Level Control Central Control Facility Customer Furnished Item Central Processing Facility European Civil Aviation Conference European Geostationary Navigation Overlay Service EGNOS GEO Transponder Service EGNOS GEO Transponder Service Provider Effective Isotropic Radiated Power EGNOS Regenerative Payload European Space Agency Fixed Gain Mode Flight Information Region Geostationary Satellite Global Navigation Satellite System Global Positioning System International Civil Aviation Organisation Interface Interface Control Document Interface Requirements Document Key Performances Indicators Mission Control Centre Mean Time Between Failure Navigation Land Earth Station Navigation Signal Generation Unit Radio Frequency 4

5 RHCP RIMS Rx SARPS SBAS SIS SOM TBC TWAN Tx Right Hand Circular Polarization Ranging and Integrity Monitoring Station Reception Standards and Recommended Practices Satellite Based Augmentation System Signal In Space Signal Operation Mode To Be Confirmed Transport Wide Area Network Transmission 1.4. Definitions EGNOS Arc EGNOS GEO Transponder Service (EGS) Hosting Site Operations Start Date (OSD) Carrier frequency means the orbital arc suitable for providing the EGNOS GEO Transponder Service over the complete FIR ECAC coverage with a minimum elevation angle of 5 degrees; means the service provided by the Contractor which includes the 2 following aspects: o o The procurement and the operations of the EGNOS GEO transponder payload. The hosting and operations of the 2 NLES associated to the GEO transponder (including adaptation of RF sections to uplink the signals to the satellite); means the premises where EGNOS NLES assets are located for the purpose of their recurrent operation; Means the date at which the EGNOS GEO Transponder Service is qualified to start its operations within the EGNOS system. This represents the dates at which the leasing of the EGNOS GEO Transponder Service operations phase starts. A carrier is hereafter specified as the un-modulated centre frequency to which signal modulation is applied. with format [X Carrier] where X can be: - L1- carrier frequency: MHz - L5 carrier frequency: MHz - L1-GAL carrier frequency: MHz - E5 carrier frequency: MHz - E5a - carrier frequency: MHz - E5b - carrier frequency: MHz Signal A signal is hereafter specified as a Navigation Signal modulating a Carrier, with format [X Signal] where X can be the following values: 5

6 - L1-SBAS - L5 - L1-GAL - E5 - E5a - E5b Signal Component A signal component is hereafter specified as the component of the navigation signal with format [X Component] or [Y-X] where X can be the following values: - I or Q for multiplexed signals combining 2 sub-signals - A, B or C for multiplexed signals combining 3 sub-signals And Y can be: - L1-SBAS - L5 - L1-GAL - E5 - E5b - E5a L1-SBAS The L1-SBAS signal is GPS-like L1 signal (C/A code) as defined in [AD 1]. L5 The L5 signal is a GPS-like L5 signal as defined in [RD 2]. L1-GAL E5 E5a E5b The L1-GAL signal consists of the signal components L1-B and L1-C as defined in the Galileo OS SIS-ICD [AD 5] (CBOC signal). The E5-signal consists of the signal E5, E5b as defined in [AD 5] The E5a-signal consists of a data channel transmitted in the in-phase component and a pilot-channel transmitted in the quadrature component as defined in [AD 5]. The E5b-signal consists of a data channel transmitted in the in-phase component and a pilot-channel transmitted in the quadrature component as defined in [AD 5]. 6

7 2. INTRODUCTION TO TECHNICAL SPECIFICATIONS The first objective of the EGNOS GEO Transponder Service Procurement is to ensure the continuity of the operations of the EGNOS system by replacing the EGNOS space segment for those satellites coming in end of life in the time frame The current EGNOS system as defined in the mission requirements [RD 3] is based on augmentation service in the L1-band only. This is the version of EGNOS that will be certified in the early phase of the operations. The primary objective of the present procurement is therefore to ensure the continuity of EGNOS SIS GEO broadcast in L1 band at the most advantageous costs and in a time frame compatible with the current expected EGNOS GEO replacement schedule. Besides this primary objective, the procurement of a dual-frequency capability payload/service is also procured (L1/E5), in the perspective of evolution of the EGNOS mission towards the broadcast of EGNOS SIS through two frequencies. This dual frequency capability is currently being procured in the first EGNOS GEO Transponder Service (GEO-1 awarded contract) and shall also be the baseline for this new EGNOS GEO Transponder Service procurement. The present document is organised as follows. Section 3 provides an overall overview of the EGNOS system and defines the contours of the EGNOS GEO Transponder Service procurement. Section 4 provides the requirements for the EGNOS GEO Transponder Service, EGNOS Payload and NLES Hosting site and operations. Section 5 describes the key performance parameters that will be taken into account to characterize conditions of Underperformances Regime [RD 1]. 7

8 3. EGNOS GEO TRANSPONDER SERVICE OVERVIEW 3.1. EGNOS System Architecture The purpose of EGNOS is to implement a system that fulfils a range of user services requirements by means of an overlay augmentation to GPS, based on the broadcasting through GEO satellites of GPS-like navigation signals containing integrity and differential corrections information applicable to the navigation signals of the GPS satellites and the EGNOS GEO satellites themselves. As a result, the EGNOS system can provide integrity supported real-time positioning with Safety-of- Life (SoL) quality that allows it to address needs of all modes of transport, including civil-aviation. The EGNOS will primarily cover the ECAC region complementarily to other augmentation systems initiatives (such as WAAS in US) but extensions are being investigated to cover other adjacent regions to the ECAC region. An exact definition of the ECAC region and its limits can be found in [RD 3] and an example of the coverage extension for the Flight Information Region (FIR) is given in Figure 2. The EGNOS ground segment is responsible for the computation of the integrity messages and wide area differential corrections. To this purpose a number of Ranging and Integrity Monitoring Stations (RIMS) are deployed over the European countries (and for some of them worldwide) which collect the GPS and EGNOS GEO raw pseudo-range measurements. The network of RIMS is connected to 4 Mission Control Centres (MCCs) (of which one is master) where the integrity, differential corrections, ionospheric delays are computed by the Central Processing Facility (CPF). This information is sent in a message to the Navigation Land Earth Station (NLES) to be uplinked in a GPS-like signal (following the SBAS signal specification as defined in [AD 1]) to the space segment (3 GEO satellites). The GEO satellites broadcast the GPS-like signals transparently on the GPS L1 frequency ( MHz). Following the recent modernization of the GPS, two new signals are expected to be available for civil use: L2 at MHz and L5 at MHz. Adaptations of the EGNOS system are currently under study and prototyping to support integrity messages broadcast in the L5-band simultaneously to L1-Band, as a potential future EGNOS mission evolution [RD 2]. Furthermore, potential evolutions of the EGNOS mission will take into due account its integration with the Galileo system, and in particular the Galileo SoL service, which relies on the use of L1 and E5 signals EGNOS GEO Transponder Service Framework Figure 1 presents the overall framework of the EGNOS GEO Transponder Service procurement. The Contractor shall procure and operate the EGNOS space segment and the RF transmission and reception facilities. This RF station shall interface at RF level with the NLES subsystem (which will be installed on the site and is provided as a CFI to the Contractor) through the RF adapter. The Contractor shall host and operate the NLES equipments. The payload shall present a C1/C5 or Ku1/Ku5 L1/E5 interface to allow activation of additional operational modes (e.g. dual frequency) in the future. 8

9 Figure 1 : EGNOS GEO Transponder Service Contract Boundaries 3.3. NLES Description The NLES is the connection mean of the EGNOS system to the GEO satellite. The aims of the NLES stations are to: - generate and send a GPS-like signal to the GEO, - synchronize this signal in accordance with the GPS time on the L1-band antenna of the GEO - Send the EGNOS correction and integrity messages to the GEO. The NLES station contains an RF adapter that is used to adapt it to an already existing RF and antenna equipment for signal emission and synchronisation. Except for reliability needs, it is not requested any internal redundancy in a NLES channel because redundancy is provided already at by the global architecture of the Ground Segment. The NLES consists of the following components: - NLES Core Computer - NLES Long-Loop - NLES Core receiver - NLES Integrity Box - NLES RF Adapter - NLES Frequency Standard - NLES RF Subsystem: this component is provided by the Host Site (EGNOS GEO Transponder Service Provider). Detailed specifications for the Hosting site interface are provided in [AD 2] and [AD 3]. 9

10 4. EGNOS GEO TRANSPONDER SERVICE REQUIREMENTS 4.1. EGNOS GEO Transponder Service General Requirements EGN-GEO-SPEC EGNOS GEO Transponder Service Latest Availability Date The EGNOS GEO Transponder Service shall be provided at the latest by end of Q EGN-GEO-SPEC EGNOS GEO Transponder Service Preferred Availability Date The EGNOS GEO Transponder Service should be provided preferably already by 01/01/2013. EGN-GEO-SPEC EGNOS GEO Transponder Service Duration The EGNOS GEO Transponder Service shall be provided for a duration of 15 years from the Operations Start Date defined in EGN-GEO-SPEC EGN-GEO-SPEC EGNOS GEO Transponder Service Availability The EGNOS GEO Transponder Service shall ensure a signal availability of 99,9%, meeting the specified performances. EGN-GEO-SPEC Satellite Position The satellite carrying the EGNOS GEO Transponder payload shall be located on the EGNOS Arc as defined in section 1.4. Among the possible orbital locations within the EGNOS Arc, the capability to provide a satellite orbital location allowing the extension of the EGNOS Transponder coverage to the MEDA and ACAC regions will be considered positively EGNOS Payload Requirements EGN-GEO-SPEC Functional Requirements Antenna Transmit Coverage L1/E5 The satellite shall provide a global coverage over the ECAC region as specified in Figure 2. Global coverage to all points in view of the satellite shall be provided in the L1 and E5 frequency range with a minimum elevation of 5 degrees. 10

11 Figure 2 ECAC Region Coverage FIR EGN-GEO-SPEC Antenna Receive Coverage (C or Ku band) The receive coverage of the EGNOS GEO transponder shall ensure the uplink signal can be transmitted from 2 different stations located in Europe (EU27). The two different hosting sites shall not be co-localized (see EGN-GEO-SPEC-0.3.3). EGN-GEO-SPEC EGNOS Payload Uplink Frequency The uplink frequency from the NLES to the EGNOS transponder shall be either in C- band (C1 and C5 uplink carriers) or in Ku-Band (Ku1 and Ku5 uplink carriers) EGN-GEO-SPEC EGNOS Payload Downlink Frequency The downlink frequency from the EGNOS transponder to the EGNOS Users and NLES shall be provided in the L1 (L1 downlink carrier) - and E5 (E5 downlink carrier) frequency band. EGN-GEO-SPEC EGNOS Transponder The EGNOS Transponder shall be a dual channel transponder that translates two separate uplink signals, generated at the same Navigation Land Earth Station (NLES), to the L1 and E5 navigation frequencies for broadcast as SBAS signals. EGN-GEO-SPEC Operation Modes Downlink Signals in Transponder Bands vs. Signal The EGNOS transponder shall ensure transparent uplink / downlink channel transpositions and support multiple combinations of signals, called "Signal Operation Modes" in the transponder bandwidth. The following table presents the different combination of signals which can be transmitted over the transponder bands L1/E5. 11

12 L1 Transponder E5 Transponder Signals Operation Modes (SOM) SOM ID L1-SBAS (GPS) L1-GAL (MBOC) L5 (E5a) E5b E5 X L1 Operations only SOM#1 X X L1 Operations only SOM#2 X X L1/L5 Operations SOM#3 X X X L1/L5 Operations SOM#4 X X X L1/L5/E5b Operations SOM#5 X X X X L1/L5/E5b Operations SOM#6 X X L1/E5b Operations SOM#7 X X X L1/E5b Operations SOM#8 X X L1/E5 Operations SOM#9 X X X L1/E5 Operations SOM#10 EGN-GEO-SPEC Transponder Operation Modes vs Signal Operations Modes The EGNOS transponder shall support the following operation modes associated to the "Signal Operation Modes": 1. C1(Ku1) L1 Mode only: In this mode the C5(Ku5) /E5 channel is switchedoff. This transponder operation mode supports the L1 Signal Operation Modes (SOM#1 and SOM#2). 2. C1(Ku1) L1 and C5(Ku5) L5(E5a) Mode: In this mode both channels (C1(Ku1) /L1 and C5(Ku5)/E5) are active. However no transmission is provided by the NLES uplink station in the spectrum corresponding to the E5b part of the band; such that the transponder only retransmits in the L5(E5a) spectrum. The full E5 transponder power can be allocated to L5(E5a). This transponder operation mode supports the L1/L5 signals operations modes (SOM#3, SOM#4). 3. C1(Ku1) L1 and C5(Ku5) E5b Mode: In this mode both channels (C1(Ku1)/L1 and C5(ku5)/E5) are active. However no transmission is provided by the NLES uplink station in the spectrum corresponding to the E5a part of the band; such that the satellite only retransmits in the E5b spectrum. The full E5 transponder power can be allocated to E5b. This transponder operation mode supports the L1/E5b signal operations mode (SOM#7, SOM#8) 12

13 4. C1(Ku1) L1 and C5(Ku5) E5 Mode: In this mode both channels are active and fully occupied. This transponder operations mode supports the L1/E5 and L1/L5/E5b signal operations modes (SOM#5, SOM#6, SOM#9 and SOM#10) Performance Requirements EGN-GEO-SPEC Baseline L1 Downlink Signals and Transponder Performances The baseline L1 signal characteristics shall comply with the following parameter values presented in the table below. In addition, for those parameters not specified in Table 1, the L1 downlink signal performances shall satisfy with the SBAS L1 specifications described in [AD 1]. L1 Transponder Centre Frequency Polarization Bandwidth (1,0 db) MHz RHCP 20 MHz (target 24,552 MHz) EIRP Coverage 31.5 dbw Global Table 1 L1 Transponder Downlink Signal Performances Note: Performances are specified at End-of-Life (EoL). EGN-GEO-SPEC Baseline E5 Downlink Signals Performances The baseline E5 signal characteristics shall comply with the following parameters values presented in the table below. Baseline E5 Transponder Performances (for carrying L5 or E5b) Centre Frequency Polarization Bandwidth (1,0 db) EIRP Coverage MHz RHCP MHz 33.0 dbw Global Table 2 E5 Transponder Downlink Signal Performances Note: Performances are specified at EoL EGN-GEO-SPEC Minimum On-Ground Received Power The minimum on-ground measured received power shall be: 13

14 For L1: -158,5 dbw For E5: -155,0 dbw EGN-GEO-SPEC Baseline EGNOS GEO Transponder Reference Downlink Link Budget The following reference link budget shall be considered for the downlink. The signal link budgets are driving the specifications for the transponder specifications. For both L1 and E5, the most constraining operations mode is taken, i.e. simultaneous use of L1-SBAS and L1-GAL in L1 transponder and simultaneous use of E5a and E5b in E5 transponder. L1-SBAS E5 Signal (L5 or E5b) Tx EIRP [dbw] 31,5 33,0 Reference Downlink Frequency [MHz] 1575, ,795 Path Losses (1) [db] 188,7-186,25 Atmospheric Losses [db] 0,5 0,5 Polarisation Losses (2) [db] 3,8 3,8 Reference Receiver Gain (3) [db] Reference Receiver Noise [dbw/hz] Received Power [dbw] Downlink C/No [dbhz] (1) Assumes a path length of km (2) Assumes a transmit axial ratio of 1.2 db and 3 db Linear receiver antenna (3) 3 db Linear receiver antenna worst case configuration EGN-GEO-SPEC EGNOS GEO Transponder Uplink Performances The EGNOS GEO Transponder Uplink Performances (e.g. G/T of transponder shall be such that the downlink C/No derived in the reference link budget of EGN-GEO-SPEC is not degraded by more than 0,2 db. EGN-GEO-SPEC EGNOS GEO Transponder EIRP Stability The change in EIRP, at any location in the defined coverage area shall not exceed 1.2 db peak-to-peak for 24 hours and 1.9 db peak-to-peak over the service life. EGN-GEO-SPEC Frequency Translation Accuracy The frequency translation accuracies shall be better than 1 part in 10 6 EGN-GEO-SPEC Carrier Frequency Stability The frequency stability of the local oscillator shall be better than over 1 to 100 seconds and better than 2 x 10-7 over the service life time. EGN-GEO-SPEC Frequency Inversion The output frequency spectrum of any transposed signal shall not be inverted with respects to the input spectrum. 14

15 EGN-GEO-SPEC EGNOS GEO Transponder Gain Variation The peak-to-peak gain variation over frequency shall be less than (TBC): Signal Gain [db p-t-p] F1 F2 a b [MHz] [MHz] E5 0.6 a F L1 0.6 a F with the centre frequency f c being respectively the E5 and L1 centre frequencies (1575,42 MHz and 1191,795 MHz) F1/2 f c a/2 a/2 F1/2 b/2 b/2 F2/2 F2/2 EGN-GEO-SPEC EGNOS GEO Transponder Phase Variation The phase linearity requirements are defined as being measured over the total transmission channel, including the reception and transmission antenna with adjacent channels switched-off. The peak-to-peak phase variation over frequency shall be less than (TBC): Signal Phase [deg p-t-p] F1 F2 a b [MHz] [MHz] E5 2 a + 2 F E1 2 a + 2 F

16 with the centre frequency f c being respectively the E5 and L1 centre frequencies (1575,42 MHz and 1191,795 MHz) EGN-GEO-SPEC AM/PM Conversion The AM/PM conversion coefficient for any transponder channel with single carrier RF drive levels up to power amplifier saturation shall not exceed 3,5 /db for any modulating frequency up to 50 MHz. EGN-GEO-SPEC Phase Noise Spectral Density The single side band phase noise spectral density induced on a carrier by the payload shall not exceed the following values for the appropriate frequency range (fm): 5Hz 100Hz: 100Hz 25 khz: Beyond 25 khz: log 10 (fm) dbc/hz log 10 (fm) dbc/hz -99 dbc/hz EGN-GEO-SPEC Group Delay Stability The absolute group delay stability shall be better than 10 ns over 24 hours. EGN-GEO-SPEC Antenna Gain Variation The variation of the Tx antenna gain from any location within the global coverage shall not exceed 1.0 db. EGN-GEO-SPEC Transmit Antenna Axial Ratio The axial ratio shall not be greater than 1.2 db within the coverage area of the full operational bandwidth. EGN-GEO-SPEC L1 In-Band Spurious Outputs The total EIRP towards any point within the defined coverage area, resulting from the sum of all spurious signals shall be lower than the following values in any 4 khz slot within the frequency range: MHz to MHz: o 20 dbw for spurious signals independent of the EIRP level of the carriers o 40 dbc for spurious signals which are dependent on the EIRP level of the carriers (with 0 dbc corresponding to the carrier level) EGN-GEO-SPEC E5 In-Band Spurious Outputs The total EIRP towards any point within the satellite antenna coverage area, resulting from the sum of all spurious signals shall be lower than the following values in any 4 khz slot within the frequency range: MHz to MHz: o 20 dbw for spurious signals independent of the EIRP level of the carriers o 40 dbc for spurious signals which are dependent on the EIRP level of the carriers (with 0 dbc corresponding to the carrier level) 16

17 EGN-GEO-SPEC Out of Band Emissions The total EIPR towards any point within the satellite antenna coverage area resulting from the sum of all spurious signals shall be compliant with the table below. Frequency Band EIRP Allocation Spectral Density (dbw/khz) MHz -9.6 GPS MHz GLONASS MHz -80 Radio-Astronomy MHz -92 Radio-Astronomy MHz TBD SAR-Galileo Downlink MHz -48 Cospas-Sarsat MHz Cospas-Sarsat (MSG) MHz -48 Cospas-Sarsat MHz TBD MSS MHz TBC MSS MHz GLONASS MHz -67 Radio-Astronomy MHz -88 Radio-Astronomy MHz -84 Radio-Astronomy MHz -84 Radio-Astronomy MHz -84 Radio-Astronomy MHz -78 Radio-Astronomy MHz -78 Radio-Astronomy MHz -78 Radio-Astronomy MHz -78 Radio-Astronomy MHz -78 Radio-Astronomy MHz -77 Radio-Astronomy 10 MHz Except And And GHz MHz MHz MHz Figure 3 Maximum EIRP spectral density limitations -70 General For the bands MHz and MHz all definitions of Figure 3 above apply with priority. Where the figure does not provide a limitation, the following additional conditions apply: Emissions outside the transmit bandwidth E5 but within the band MHz shall in total not exceed 1% of the transmitted power of the E5 transponder. Emissions outside the L1 bandwidth but within the band shall in total not exceed 1% of the transmitted power over the E1 navigation signal EGNOS Payload Reliability Requirements EGN-GEO-SPEC Overall Satellite Reliability The reliability of the Signal In Space provision (platform + payload) shall be greater than: - 0,99 (TBC) for a mission duration of 3 years - 0,97 (TBC) for a mission duration of 5 years - 0,93 (TBC) for a mission duration of 10 years 17

18 - 0,88 (TBC) for a mission duration of 15 years EGNOS Payload Operational Requirements EGN-GEO-SPEC ALC / FGM Mode The EGNOS GEO Transponder shall provide a ALC and FGM mode. EGN-GEO-SPEC GEO Transponder Path Control The transponder channels shall have adjustments and command functions for power amplifier switch ON/OFF, channel gain and level control setting. The gain shall be adjustable in steps of 1 db. EGN-GEO-SPEC Cessation of Emission It shall be possible to turn each individual transmission channel on or off by ground command. This operation shall be independent of gain settings. EGN-GEO-SPEC Doppler Shift Impact on Operations The Doppler shift, as perceived by a stationary user, on the signal broadcast by the satellite shall be less than ±40 meters per second (210 Hz at L1) in the worst case (at the end of life of the GEO satellite) NLES Hosting Sites and Operations This section describes the generic requirements that shall apply for the procurement and Operations of the NLES Hosting Site (including RF station). The generic hosting requirements are described in the NLES Hosting Site IRD document [AD 3] and shall be used as the basis for the definition of a proper NLES Hosting ICD. EGN-GEO-SPEC NLES Primary RF Characteristic The RF performances parameters of the NLES shall be defined such that the following constraints are satisfied: Parameter Transmitted EIRP in C1/C5 (Ku1/Ku5) Value Shall be such that the user C/No is not degraded by more than 0,2 db compared to the downlink C/No as defined in the table of EGN-GEO-SPEC NLES Minimim G/T in reception for the L1 signal Shall ensure that the C/No received at the NLES in L1 is > 70 dbhz (TBC) NLES Minimum G/T in reception for the E5 signal Shall ensure that the C/No received at the NLES in E5 is > 70 dbhz (TBC) Figure 4 Constraints on NLES Primary RF Characteristics Dimensioning 18

19 Hosting Sites Requirements EGN-GEO-SPEC Number of NLES Sites The Contractor shall propose 2 NLES site locations per EGNOS GEO Transponder Service. EGN-GEO-SPEC NLES Site Location Requirements The NLES sites shall be located in Europe (EU 27 + Switzerland and Norway) and shall be distant by 50 km minimum. EGN-GEO-SPEC NLES Hosting Site Requirements The NLES Hosting Site shall meet the generic requirements expressed in [AD 2]. EGN-GEO-SPEC NLES Hosting Site Security Requirements The Contractor shall be able to demonstrate that the Hosting Sites satisfies to minimum security requirements expressed in [AD 2], Section 9. EGN-GEO-SPEC NLES Hosting Site RF Interface The NLES Hosting Site RF interface shall be compliant with the requirements expressed in Annex A of the Hosting Site IRD [AD 3][AD 4] NLES RF Services Performances Requirements EGN-GEO-SPEC NLES RF Station Availability The NLES RF Station availability should be better than 99.95%, meeting the specified performances. The NLES RF Station availability shall ensure the overall EGNOS GEO Transponder Service availability expressed in EGN-GEO-SPEC EGN-GEO-SPEC NLES RF Station Mean Time Between Failures The NLES RF station Mean Time Between Failure (MTBF) shall not be less than 5000 hours. EGN-GEO-SPEC NLES RF Uplink Frequency Band The NLES RF uplink frequency shall be either C-band or Ku-band. EGN-GEO-SPEC NLES RF Uplink Frequency Tunability The NLES RF Uplink transmitting equipment shall accommodate the full range of uplink Doppler shift for up to ±5 of orbital inclination, with an additional ±1 KHz allowance for frequency translation errors. EGN-GEO-SPEC NLES Receive L1-Band Requirements The NLES L-Band receive capabilities include reception of the navigation message signal carrier formats described in the L1 SBAS specifications. The L1 receive pass-band (0,5 db points) shall be MHz. EGN-GEO-SPEC NLES Receive E5-Band Requirements The NLES L-Band receive capabilities include reception of the navigation message signal carrier formats described in the E5 SBAS specifications. The E5 receive pass-band (0,5 db points) shall be MHz. 19

20 EGN-GEO-SPEC NLES Transmitted EIRP Density in Antenna Sidelobes (Ref. ITU-R Rec ) The NLES EIRP density in any direction within 3 degrees of the geostationary satellite orbital arc, at the indicated off-axis angle, shall not exceed: Off-Axis Angle Degrees EIRP dbw per 4 khz 2.5 < θ < log 10 θ 7 < θ < < θ < log 10 θ 48 < θ < EGN-GEO-SPEC NLES Transmit Phase Noise The total phase noise induced on an unmodulated test carrier (C or Ku-band) transmitted by the NLES shall have a single sided power density spectrum in which each sideband, above and below the carrier, shall not exceed the following limits: Hz from f c : log 10 f m dbc/hz Hz from f c : log 10 f m dbc/hz Hz from f c : log 10 f m dbc/hz - > 1000 Hz from f c : -85 dbc/hz Where f c is the carrier frequency and f m is the separation between f c and the measurement frequency. If any discrete phase noise components are present, at a level which exceeds the mask, the sum of the discrete phase noise components and continuous spectral component integrated over a bandwidth of ±10 Hz on either side of the discrete component shall not exceed the phase noise mask. Phase noise very close to the carrier will be tracked and therefore compensated for by the NLES closed loop timing process, to ensure compliance with the total phase tracking error requirement of the SBAS signal specification. EGN-GEO-SPEC NLES C1 (Ku1) Transmit Channel Characteristics The NLES transmitting channel, between the signal modulator IF interface and the RF transmit antenna feed, shall meet the following requirements: (a) AM/PM Conversion The total AM/PM conversion shall not exceed 2.5 /db at the operational output power of the NLES (b) Phase Linearity ±TBD rad over 20 MHz centred at the nominal operating frequency (c) Gain Flatness ±TBD db over 20 MHz centred at the nominal operating frequency 20

21 NLES Operations Requirements EGN-GEO-SPEC NLES C5 (Ku5) Transmit Channel Characteristics The NLES transmitting channel, between the signal modulator IF interface and the RF transmit antenna feed, shall meet the following requirements: (d) AM/PM Conversion The total AM/PM conversion shall not exceed 2.5 /db at the operational output power of the NLES (e) Phase Linearity ±TBD rad over MHz centred at the nominal operating frequency (f) Gain Flatness ±TBD db over MHz centred at the nominal operating frequency NLES Operations Requirements EGN-GEO-SPEC NLES Antenna Steerability and Tracking The antenna shall be capable of tracking a satellite in nominal geostationary orbit. The maximum expected deviation by the satellite from its nominal position will be ±0.1 in longitude and 3 (TBC) in inclination. The antenna shall be capable of being pointed to any location on the geostationary arc visible to the NLES and be capable of tracking the satellite movements with accuracy such that the EIRP stability is better than (TBD). 21

22 5. EGNOS GEO TRANSPONDER SERVICE PERFORMANCES INDICATORS The following table contains the EGNOS GEO Transponder Service Specifications that shall trigger the Underperformance Regime for the operational phase as defined in the Statement of Work [RD 1]. The EGNOS GEO Transponder Service availability EGN-GEO-SPEC will be the main requirement against which the Underperformance Regime will be assessed. The EGNOS GEO Transponder Service is defined as available when the following minimum requirements are met EGN-GEO-SPEC Antenna Transmit Coverage EGN-GEO-SPEC Baseline L1 Downlink Signals and Transponder Performances EGN-GEO-SPEC E5 Downlink Signals and Transponder Performances EGN-GEO-SPEC EGNOS GEO Transponder EIRP Stability The unavailability events are counted after a continuous unavailability of 5 minutes. 22