Accurate Time & Frequency System

Transcription

1 GPS-Disciplined Rubidium/OCXO Clck Key features: Frequency Accuracy : 1E-12 1PPS Accuracy: 20ns RMS Hldver: 1µs/24 hurs, 5E-11/mnth 20 utputs (10MHz, 1PPS, TOD) LAN ( NTP, Mnitr & Cntrl) External 1PPS / Frequency input fr disciplining C(A) cde GPS receiver Frnt Panel Display (Time, Date, BIT and mre) Mnitr & cntrl: RS232, UDP Supply Vltage: 90/260 VAC Delay Crrectin fr Input & Output Optins: P (Y) cde GPS receiver Up t 3 channels LAN interface SNMP Mnitr & Cntrl IEEE 1588 / PTP Grandmaster DDS - Up t 30MHz, 32 bit reslutin Supply Vltage: DC r DC&AC TOD Frmat: IRIG-B,NMEA,IRIG-A, NASA-36 External frequency and TOD distributr Graphic User Interface (GUI) Sftware fr PC Descriptin The AR77A is a multi-functin GPS Disciplined Rubidium Atmic Clck, which prvides accurate time & frequency. The AR77A incrprates numerus features int a single bx, including a Rubidium Frequency Standard, an internal C/A cde 12 channels GPS receiver (r P(Y) cde GPS receiver. The GPS receiver must be supplied by user) and an input frm external 1PPS / frequency. The varius ptins f the unit include a variety f different frequencies and several Time Cdes utputs. The Rubidium Standard functins as a lcal scillatr and is phase-lcked t the GPS r t external inputs. All utputs are derived frm the Rubidium Clck, which maintains accurate time and frequency when GPS r ther inputs are interrupted. Fr lw cst applicatins an Oven Cntrl Crystal Oscillatr (OCXO) is ffered instead f Rubidium Frequency Standard. The unit includes up t three physical LAN interfaces bards, which supprt UDP / SNMP fr management and fr NTP (Netwrk Time Prtcl). The three LAN bards can be used fr three different netwrks (with three different IP netwrk addresses), r fr tw netwrks where the 3rd LAN bard is reserved as a redundant backup. A Precisin-Time Prtcl (PTP) is available with ne f the LAN bard. The AR77A prvides multiple utputs: 10 cax utputs, tw fixed (10MHz and 1PPS) and 8 cnfigurable utputs which can be selected frm 1PPS, 10MHz, and mre. Additinal utputs are available n the D-Type cnnectr including differential RS422 utputs, TOD (Time Of Day) utputs with several standard prtcl like NMEA, IRIG B and Have Quick. The unit is 19 x 1U rackmuntable encasement. Applicatins Test Equipment Telecmmunicatin Cellular Base Statins Scientific Equipment Secure Cmmunicatin Mbile Radi Base Statins

2 All specs 25 C, quiescent cnditins and sea level ambient unless therwise specified Basic Cnfiguratin Optins (*) BNC Cnnectrs * 5 x Sine Wave (10±2 dbm) * 5 x 1PPS (TTL/50Ω) The user can set ther utputs cnfiguratins (see S/W ICD) Other cmbinatins f the fllwing signals are available upn request: Frequency: 1MHz, 5MHz, 2.048MHz (sine r square) and thers DDS frequency: 1KHz 30MHz TOD: IRIG B (additinal frmats are als available), Have Quick, NMEA Outputs 44 pins D Type Cnnectr Other cmbinatins f the fllwing signals are available upn request : Frequency: 1MHz, 5MHz, 2.048MHz (sine r square) and mre ther frequencies DDS frequency: 1KHz 30MHz TOD: NMEA, Have Quick * 4 x 1PPS (RS-422) * 2 x 10MHz (RS-422) * 4 x 1PPS (ICD-GPS-060) * 5 x TOD ICD-GPS-060 -Have Quick * H/W BIT (pen cllectr) Inputs BNC Cnnectr 44 pin D Type Cnnectr Fr Time and Frequency Disciplining: 1PPS (TTL/50Ω r ICD-GPS-060) 10MHz Crypt keys & ZEROIZE CVS Frequency: 1MHz, 2.048MHz, 5MHz and mre TOD: IRIG B (mre frmats are available as well) TOD: NMEA Frnt panel Crypt keys LAN NTP server V3 per RFC1305 1ms, each LAN bard can supprt up t 1100 NTP requests per secnd Cntrl & Mnitring (UDP) IEEE 1588 / PTP Grandmaster / slave (ne utput) Up t 3 independent LAN prts (3 NTP servers r 2 NTP servers and ne PTP) Each ne has a different IP address serving three separates netwrks SNMP V3 CLI RS-232 prt (single ended r RS-422 ) remte cntrl (*) Cntact factry fr detail 10MHz GPS Antenna Crypt Keys 1PPS Cnfigurable Outputs x 8 External 1PPS / frequency TOD AR77A Differential 1PPS 1PPS PTTI TOD PTTI Pwer Supply RS-422 NMEA LAN prts (1..3) RS-232

3 All specs 25 C, quiescent cnditins and sea level ambient unless therwise specified Perfrmance (with Rubidium Frequency Standard as the lcal scillatr) Mde f wrk Disciplined t GPS r t external 1PPS Free running Rubidium Time (1PPS) 20ns RMS relative input 1 µs/ 24 hurs (typical) After 24 hurs f disciplining Lng Term Stability 1E-12 5E-11 / mnth Shrt Term Stability (ADEV) Standard 1s 100s Imprved (ptin) Cntact factry fr infrmatin Temperature Stability ±3E-10 ver -20 C t +65 C Standard (typical) Imprved (ptin) Frequency Phase Nise (*) (@ 10MHz) 1Hz 10Hz 100Hz 1KHz 10KHz 10Hz 100Hz 1KHz 10KHz Harmnics (*) (10MHz) -48dBc Standard (typical) Imprved (ptin) Spurius (*) (10MHz) -110dBc@±100KHz Warm-up time Rubidium Lck < 4 minutes 5E-11 within < 60 minutes 1E-11 within < 4 hrs 1E-12 within < 24 hrs (*) The abve figures are given fr the J17 utput. Sme degradatin may ccur fr ther utputs. Fr the lw phase nise ptin, the unit distributes the lw phase nise signal fr tw utputs and will maintain the perfrmance under 1g@5-200Hz sine wave vibratins. The spurius level under 1g@5-200Hz sine wave vibratins can degrade t -58dBc fr the vibratin frequency nly.

4 All specs 25 C, quiescent cnditins and sea level ambient unless therwise specified GPS C(A) Cde Receiver GPS Tracking Ephemeris & Almanac L1 frequency 1575 MHz C/A cde (SPS), 12 parallel tracking channels Available n 44 pin D Type cnnectr (ptin) Psitin Accuracy Latitude, Lngitude: < 6m (CEP 50%), Altitude: < 11m (CEP 50%) Acquisitin Time (Typical) (*) GPS Antenna DC Vltage Warm start 45 secnd, Cld start 50 secnd (wrst case) 5VDC (up t 100 ma) (*) The acquisitin time refers t the GPS receiver utput. Fr frequency stabilizatin during Warm-up see abve. GPS P(Y) Cde Receiver GB-GRAM (ptin) The GPS receiver must be supplied by user GPS Tracking Psitin Accuracy Acquisitin Time (Typical) (*) GPS Antenna DC Vltage L1/L2 frequency P(Y) cde SAASM 12 parallel tracking channels PPS: <12m CEP Cld start < 12.5 min Warm Start <1 min 5VDC (up t 100 ma) Envirnmental Operating Temperature -20 C t +65 C Strage Temperature Humidity Vibratin -20 C t +70 C Up t 95% at 35 C, nn-cndensing 2.5g RMS Safety Safety Standard CE (safety) Pwer Supply Pwer Supply Pwer Cnsumptin Pwer Supply Redundancy (ptin) VAC 47/63 Hz (Optin: DC pwer supply 28VDC± 4V, -48VDC) < 37W Warm-up, < 25W Steady state Optins fr pwer supply redundancy: 1. Tw pwer supply inputs ne fr AC and the ther fr DC 2. Tw DC pwer supply inputs

5 All specs 25 C, quiescent cnditins and sea level ambient unless therwise specified Frnt panel display & indicatins and GUI Display LED Indicatins The LCD frnt panel display and buttns enable the user t view and cnfigure mst parameters. The displayed infrmatin includes the Time, Date, BIT, GPS parameters (antenna current, satellite status) and mre. Cnfigured parameters include time synchrnizatins surce, 1PPS delay, utputs cnfiguratin and mre. Fr details see user manual r cntact factry. Flrescent display is available as an ptin (instead f the LCD display). 4 LEDs n the frnt panel: Pwer, Overall BOT, TOD Surce, 1PPS / FREQ Surce Graphic User Interface (GUI) ptin (The GUI is sftware fr PC used fr maintenance and as a starter kit) Time / date display Satellites in view Navigatin data frm GPS and BIT (Built In Test) Time surce & Time zne Leap secnds (frm UTC t GPS) IP address cnfiguratin Antenna cable delay External input and 1PPS utput delay Matrix cnfiguratin Time setting GPS / UTC Additinal parameters Principles f Operatin The fllwing blck diagram describes the peratin f the AR77A. The unit includes Rubidium Clck and accepts inputs frm either internal GPS receiver r external 1PPS & TOD surces. All utputs are derived frm the internal Rubidium Clck, which is phase-lcked via a digital PLL t the internal GPS receiver r t ne f the external inputs. This way, the Rubidium Clck fllws the GPS lng term accuracy and cleans the jitter and the nise n the shrt and medium terms. When the GPS receptin is lst, fr shrt r lng perids f time, the Rubidium cntinues t maintain accurate time and frequency.

6 All specs 25 C, quiescent cnditins and sea level ambient unless therwise specified Precisin Time Prtcl PTP (ptin) IEEE V2 PTP Grandmaster/Slave Multicast / Unicast mdes f peratin UDP/IPv4 (L2 r L3) Design t handle up t 200 slaves simultaneusly. Accuracy: 1µs (netwrk dependency) In the fllwing figure, tw AR77A units are intercnnected via a netwrk (ne as a master and ne as a slave). The time interval between the tw 1PPS utputs was measured ver time and the results are shwn in the plt belw. Time accuracy < 50ns RMS

7 All specs 25 C, quiescent cnditins and sea level ambient unless therwise specified Perfrmance (with OCXO as lcal scillatr instead f Rubidium) (ptin) Mde f wrk Disciplined t GPS r t external 1PPS Free running Rubidium Time (1PPS) 100ns RMS relative 25 C 1 ms/ 24 hurs (typical) After 24 hurs f disciplining. Accuracy 1E-11 2E-8 / mnth (after 30 days f peratin) Frequency Shrt Term Stability (ADEV) Temperature Stability Phase Nise (10MHz) (*) Harmnics (10MHz) (*) Spurius (10MHz) (*) Warm-up time 1s ±200 ppb ver -20 C t +70 C 1Hz 10Hz 100Hz 1KHz -48dBc 1E-11 within < 24 hrs (*) The abve figures are given fr the J17 utput. Sme degradatin may ccur fr ther utputs.

8 External distributr (ptin) The AR77A can be cnnected t an external distributr (AccuBeat's mdel: AD12A-03) cmprising f tw redundant inputs and 12 utputs. The signal frm the first input is distributed t all the utputs and in case f failure frm the first input the unit autmatically switches t the secnd input. Fr mre details cntact factry. External distributr - mechanical ICD Frnt Panel Rear Panel Side view Tp View

9 AR77A GUI Time reprt screen BIT Reprt screen

10 All specs 25 C, quiescent cnditins and sea level ambient unless therwise specified Electrical ICD Cnnectr Descriptin Standard Type Optins J1 Pwer supply AC, Standard Inlet (IEC320) 28VDC / -48VDC J2 GPS antenna TNC, Female --- J3 J5 LAN RJ J6 CLI D9, Female --- J7 Additinal I/O D type, 44 pin, Female --- J8 J17 Cax utputs BNC, Female TNC, Female J18 - J19 Inputs BNC, Female TNC, Female Frnt panel Crypt keys TBD --- J6 RS-232 cmmunicatin t PC - 9 pin D type cnnectr signals: Pin Number Functin 2 CLI-Tx (t PC) 3 CLI-Rx (frm PC) 5 GND 1, 4, 6, 7, 8, 9 Nt used RS-232, 19,200 baud rate, 1,8,1 n parity (default) J7 Auxiliary Time, Frequency, cmmunicatin and miscellaneus - 44 pin D type cnnectr signals (Standard cnfiguratin): With this cnnectr the custmer can get additinal utputs such as: 1PPS, 10PPS (and mre, TTL r RS-422), additinal square-wave frequencies (TTL r RS-422), TOD (Time f Day) in NMEA / IRIG B (DC) / Have-Quick, CLI cmmunicatin in RS-422 and Overall BIT indicatin. Please nte that in the table belw, utputs f pins 6 13, 16 19, and are ffered as an ptin.

11 Pin # Functin Pin # Functin 1 CLI_IN RS GND 2 CLI _IN RS FACTORY USE (Lck signal) 3 CLI _OUT RS GND 4 CLI _OUT RS TOD #1 (TTL / 100khm) 5 GND 27 TOD #2 (TTL / 100khm) 6 X_PPS_RS422+ utput (#1) 28 TOD #3 (TTL / 100khm) 7 X_PPS _RS422- utput (#1) 29 TOD #4 (TTL / 100khm) 8 Y_PPS _RS422+ utput (#2) 30 TOD #5 (TTL / 100khm) 9 Y_PPS _RS422- utput (#2) 31 GND 10 Z_PPS _RS422+ utput (#3) 32 1PPS #1 (TTL / 50hm) utput 11 Z_PPS _RS422- utput (#3) 33 1PPS #2 (TTL / 50hm) utput 12 W_PPS _RS422+ utput (#4) 34 1PPS #3 (TTL / 50hm) utput 13 W_PPS _RS422- utput (#4) 35 1PPS #4 (TTL / 50hm) utput 14 GND 36 Over all BIT (pen cllectr), < 100mA Lw = OK, High impedance = fail V (internal 300Ω series resistr) 37 GND 16 AUX Frequency RS422 OUT+ (#1) Default: 10MHz 38 KYK-13/KOI-18 CLOCK AUX Frequency RS422 OUT - (#1) KYK-13/KOI-18 DATA Default: 10MHz MIL AUX Frequency RS422 OUT + (#2) KYK-13/KOI-18 CTS GPS Default: 10MHz Crypt AUX Frequency RS422 OUT - (#2) Keys KYK-13/KOI-18 SENSE Default: 10MHz 20 GND 42 KYK-13/KOI-18 LOGIC REF 21 NMEA_RxD_RS KEY_LOAD_EN_FALSE 22 NMEA_TxD_RS ZEROIZE_CVS AR77 - Mechanical ICD Dimensins: 19 (482.6 mm), 1U (43.7mm) Frnt panel Rear panel DC pwer input cnfiguratin Rear panel AC pwer input cnfiguratin

12 Weight: 5 kg

13 HOW TO ORDER: AR77 X1 X2 X3 - X4 X5 X6 X7 X8 X9 X10 Optins Oscillatr Type R Rubidium (standard) X - OCXO GPS Receiver Type C C (A) cde (standard) P P (Y) cde 0 N ther ptins (standard) 1 LAN UDP (ASCII frmat, similar t AR73A-16) 2 COM in AR73A-15 frmat 3 10PPS Outputs 4 External distributer (AD12A) 5 10MHz Imprved P.N & Spurius PTP 0 N PTP (standard) P PTP Grand master Pwer Supply A AC (standard) B - +28VDC C (-48)VDC D (-48)VDC x 2 AUX Time Cdes 0 N AUX time prtcl (standard) N NMEA A Almanac & Ephemeris LAN Interfaces 0 N LAN 1 1 x LAN interface (NTP, UDP) (standard) 2 2 x LAN interface (NTP, UDP) 3 3 x LAN interface (NTP, UDP) Time Cdes 0 N time cde (standard) H Have Quick (GPS ICD GPS 060) I IRIG B (AM) A Have Quick and IRIG B (AM) Caxial utputs cnfiguratins (J8 J17) A 10MHz sine, 1PPS (*) B 1 x 10MHz sine + 1 x 1PPS + 8 x 2.048MHz C - 1 x H.Q.(PTTI), 4 x 1PPS (TTL), 5 x 10MHz (Sine) D 1 x 10MHz sine Imprved P.N & Spurius, 7 x IRIG B S - Custmized special cnfiguratin & frequency (the final part number will be define befre PO) AUX utputs cnfiguratins (44 pins D Type cnnectr ) 0 N AUX utputs n this cnnectr (standard) A 4 x 1PPS (pins # 32 35) B 6 x H.Q Outs (PTTI), 6 x 1PPS Outs (PTTI) (*) The user can cnfigure the utputs by using a CLI cmmand. Cntact factry. (**) Special frequencies like 120MHz are als available per request. Cntact factry Nte: the P (Y) cde GPS receiver must be supplied by user