Accurate Time & Frequency System

Transcription

1 Mdel AR76A 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, ) LAN IPV4 (NTP V3, Mnitr & Cntrl, DHCP) External 1PPS / Frequency input fr disciplining 12 channel 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: Up t 3 channels LAN interface SNMP Mnitr & Cntrl (Custm MIB) IEEE 1588 / PTP Grandmaster DDS - Up t 30MHz, 32 bit reslutin Supply Vltage: DC r DC&AC Graphic User Interface (GUI) Sftware fr PC Frmat: IRIG-B,NMEA,IRIG-A, NASA-36 P(Y) cde SAASM GPS receiver Descriptin The AR76A is a multi-functin GPS Disciplined Rubidium Atmic Clck, which prvides accurate time & frequency. The AR76A incrprates numerus features int a single bx, including a Rubidium Frequency Standard, an internal C/A cde 12 channels GPS receiver, 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 AR76A 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, (Time Of Day) utputs with several standard prtcl like NMEA, IRIG B etc and mre. The unit is 19 x 1U rackmuntable encasement. Nte: Have-Quick Time Cde and an ptin fr P(Y) SAASM GPS receiver are available in mdel AR77A. Cntact factry fr details. Applicatins Test Equipment Telecmmunicatin Cellular Base Statins Scientific Equipment Secure Cmmunicatin Mbile Radi Base Statins AccuBeat Ltd

2 Mdel AR76A 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/50) 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 : 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 : NMEA * 4 x 1PPS (RS-422) * 2 x 10MHz (RS-422) * 4 x 1PPS (ICD-GPS-060) * 5 x ICD-GPS-060 -Have Quick * H/W BIT (pen cllectr) Inputs BNC Cnnectr Fr Time and Frequency Disciplining: 1PPS (TTL/50 r ICD-GPS-060) 10MHz Frequency: 1MHz, 2.048MHz, 5MHz and mre : IRIG B (mre frmats are available as well) 44 pin D Type Cnnectr : NMEA LAN IPV4 NTP server V3 per RFC1305 1ms, each LAN bard can supprt up t 1100 NTP requests per secnd DHCP 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 (Custm MIB) CLI RS-232 prt (single ended r RS-422 ) remte cntrl (*) Cntact factry fr detail 10MHz GPS Antenna 1PPS Cnfigurable Outputs x 8 External 1PPS / frequency AR76A Differential 1PPS 1PPS PTTI PTTI Pwer Supply RS-422 NMEA LAN prts (1..3) RS-232 AccuBeat Ltd

3 Mdel AR76A 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 Cntact factry fr infrmatin Harmnics (*) (10MHz) -48dBc Spurius (*) (10MHz) 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. AccuBeat Ltd

4 Mdel AR76A 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 000 ma) (*) The acquisitin time refers t the GPS receiver utput. Fr frequency stabilizatin during Warm-up see abve. Envirnmental Operating Temperature -20 C t +65 C Strage Temperature Humidity Vibratin (Transprtatin) -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) < 35W Warm-up, < 20W 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 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 BIT, 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 AccuBeat Ltd

5 Mdel AR76A All specs 25 C, quiescent cnditins and sea level ambient unless therwise specified Principles f Operatin The fllwing blck diagram describes the peratin f the AR76A. The unit includes Rubidium Clck and accepts inputs frm either internal GPS receiver r external 1PPS & 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. frm Display key pad GPS Receiver 1 PPS #1 Freq. Ext.1 PPS #2 Cntrl Rubidium μp Clck #3 Reader 1 PPS 10 MHz DATA LCD Display #4 Pririty Gate 1 PPS Phase Detectr 1 PPS Generatr LAN Bards Divide by 1E7 Sync 10 MHz Out 1 PPS Out (IRIG, HQ, NMEA) LAN & Navigatin (RS232) MATRIX Outputs Other Frequencies AccuBeat Ltd

6 Mdel AR76A 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 AR76A 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 AccuBeat Ltd

7 Mdel AR76A All specs 25 C, quiescent cnditins and sea level ambient unless therwise specified Perfrmance (with OCXO as lcal scillatr instead f Rubidium) Mde f wrk Disciplined t GPS r t external 1PPS Free running OCXO 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) Shrt Term Stability (ADEV) Temperature Stability 1s ±200 ppb ver -20 C t +70 C Standard Imprved (ptin) Frequency Phase Nise (10MHz) (*) 1Hz 10Hz 100Hz 1KHz 10KHz 100KHz 1Hz 10Hz 100Hz 1KHz 10KHz 100KHz Harmnics (10MHz) (*) -48dBc Spurius (10MHz) (*) Warm-up time 1E-11 within < 24 hrs (*) The abve figures are given fr the J17 utput. Sme degradatin may ccur fr ther utputs. AR76A GUI Time reprt screen BIT Reprt screen AccuBeat Ltd

8 Mdel AR76A All specs 25 C, quiescent cnditins and sea level ambient unless therwise specified Electrical ICD Cnnectr Descriptin Standard Cnfiguratin J1 Pwer supply AC, Standard Inlet (IEC320) J2 GPS antenna TNC, Female J3 J5 LAN RJ-45 J6 CLI D9, Female J7 Additinal I/O D type, 44 pin, Female J8 J17 Cax utputs BNC, Female J18 - J19 Inputs BNC, Female 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: 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), (Time f Day) in NMEA r IRIG B (DC) r ther frmats, 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 ptin. 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 #1 (TTL / 100khm) 5 GND 27 #2 (TTL / 100khm) 6 X_PPS_RS422+ utput (#1) 28 #3 (TTL / 100khm) 7 X_PPS _RS422- utput (#1) 29 #4 (TTL / 100khm) 8 Y_PPS _RS422+ utput (#2) 30 #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 AUX Frequency RS422 OUT - (#1) 39 Default: 10MHz FACTORY USE 18 AUX Frequency RS422 OUT + (#2) Default: 10MHz AUX Frequency RS422 OUT - (#2) 41 AccuBeat Ltd

9 Mdel AR76A Pin # Functin Pin # Functin Default: 10MHz 20 GND NMEA_RxD_RS NMEA_TxD_RS Mechanical ICD Frnt panel Rear panel AccuBeat Ltd

10 Mdel AR76A HOW TO ORDER: AR76 X1 X2 X3 - X4 X5 X6 X7 X8 X9 Optins Oscillatr Type R Rubidium (standard) X - OCXO Pwer Supply A AC (standard) B - +28VDC C (-48)VDC D (-48)VDC x 2 0 N ther ptins (standard) 1 LAN UDP (ASCII frmat, similar t AR73A-16) 2 - Rubidium imprved phase nise 3 10PPS Outputs 4 Reserved 5 OCXO imprved phase nise 6 AR73A-16 RTR (CLI) as default A TNC cnnectrs (n ther pt) B TNC cn + AR73A-16 RTR (CLI) def. PTP 0 N PTP (standard) P PTP Grand master 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) AUX Time Cdes 0 N AUX time prtcl (standard) N NMEA A Almanac & Ephemeris Time Cdes Caxial utputs cnfiguratins (J8 J17) (*) A 10MHz sine x 5, 1PPS x 5 B 10MHz sine x 1+ 1PPS x MHz x 8 C - Reserved D - 10MHz sine, 1PPS, 10PPS, IRIG B E - 10MHz sine x 5, 1PPS x 2, 1PPM x 2, IRIG B (AM) x 1 F - 10MHz, 1PPS, IRIG B (AM) x 4, IRIG B (DC) x 4 G 10MHz sine x 4, 1PPS x 5, IRIG B (AM) x 1 S - Custmized special cnfiguratin & frequency (the final part number will be define befre PO) (*) The user can cnfigure the utputs by using a CLI cmmand. Cntact factry. (**) Special frequencies like 120MHz are als available per request. Cntact factry 0 N time cde (standard) H Have Quick (GPS ICD GPS 060) I IRIG B (AM) A Have Quick and IRIG B (AM) B IRIG B (AM & DC) AUX utputs cnfiguratins (44 pins D Type cnnectr ) 0 N AUX utputs n this cnnectr (standard) A 4 x 1PPS (pins # 32 35) B AUX with fast UART fr TIC measurement C 4 x 1PPS RS422 utputs D - 4 x 1PPS RS x 1PPS PTTI utputs E 4 x 1PPM utputs (RS422) F 4 x 10PPS utputs (RS422) Nte: P(Y) SAASM GPS receiver are available in mdel AR77A. Cntact factry fr details. AccuBeat Ltd