AR51A-09
GPS-Disciplined Rubidium Clock
Accurate Time & Frequency System for Military Applica ons
AR51A-09
Features
• GPS disciplined Rubidium clock
• Frequency Accuracy : 1E-12
• 1PPS Accuracy: 30ns (RMS)
• Mul ple outputs: 10MHz, 1PPS, TOD (Time of Day)
• TOD protocols: Have Quick, CLI
• Inputs: GPS antenna, 1PPS, TOD
• Holdover (no GPS): 1μs/24 hrs (typ.), 5E-11/month
• Monitor & Control: RS232 / RS422
• C/A code GPS receiver
• MIL-STD qualifica on for airborne applica ons
• Compact: 175 mm (d) x 132 mm (w) x 56 mm (h)
Op ons:
• P(Y) code GPS (SAASM) receiver
• TOD: NMEA, NTP/PTP, IRIG B
• Monitor & Control: LAN (UDP, SNMP)
Application
• Fighter Aircra
• Helicopters
• UAV’s
• Ship Borne
• Submarine
• Mobile Land Pla orms
Description
The AR51A-09 unit is a compact GPS-Disciplined Rubidium Clock, which offers an excellent stability and accuracy. The unit includes a
Rubidium-Atomic-Standard, which is phase-locked to the disciplining source (like GPS or other external inputs).
All outputs are derived from the Rubidium-Atomic-Standard and maintain highly accurate me and frequency even when GPS recep on
interrupted.
The AR51A-09 includes Time of Day (TOD) inputs and outputs. The standard unit include several Have Quick (ICD-GPS-060) Time Code
outputs, followed by several (more than 20) 1PPS outputs (PTTI ICD-GPS-060, TTL and RS-422 formats) for accurate ming which is essen al
for secure radio communica on applica ons. The standard unit includes also Have Quick (ICD-GPS-060) Time Code input for ini al me
loading followed by 1PPS input for the 1PPS ming synchroniza on, when the GPS signal is not available. The communica on with the unit is
the CLI (Command Line Interface) by RS-232 or RS-422. The CLI outputs provides Time, Naviga on and status data. The unit can be configured
by CLI input channel.
Other Time of Day formats are available as an op on like NMEA, IRIG B, NTP or PTP.
The AR51A-09 can be synchronized from 3 independent inputs: internal GPS, external GPS and other external independent accurate ming
systems. The input synchroniza on source is selected manually by user or automa cally.
Standard op on of the unit is LAN interface, which include NTP (Network Time Protocol), and Monitor & Control by UDP or by SNMP.
Page 1 of 8
Vectron Interna onal • 267 Lowell Road, Suite 102, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • h p://www.vectron.com
Rev 1.0 Oct 2014
Performance Specifica ons
All specifica ons are at room temperature, quiescent condi ons, sea level ambient unless otherwise specified
Input & Outputs
10MHz, Sine wave (8±3) dBm / 50Ω (x 1)
1PPS TTL/50Ω (x 2)
1PPS RS-422 (x 5)
Outputs(*)
1PPS PTTI (ICD-GPS-060)/ 50Ω (x 17)
TOD Have Quick (ICD-GPS-060) / TTL 100KΩ (x 4)
H/W BIT (open collector) (x 1)
TOD Have Quick (ICD-GPS-060) / TTL 100K
Ω
(x 1)
Input
1PPS TTL/50Ω or PTTI, ICD-GPS-060/ 50Ω (x 1)
1PPS RS-422 (x 1)
GPS Antenna
CLI
Communica on
MIL-GPS Keys
CLI – Command Line Interface, RS232 or RS422 for status monitoring and control
for unit configura on
Baud rate: 19,200, Control: 1, N, 8
Op ons: LAN – UDP & SNMP, MIL- STD-1553RT (Mux-Bus)
Op on: P (Y) code GPS receiver crypto keys
Op ons: NMEA, IEEE 1588 (PTP) – Slave, IRIG B
Op ons: NMEA, NTP server V3 per RFC1305
≤
1ms, IEEE 1588 (PTP) –
Grandmaster, IRIG B
(*) For other outputs contact factory
AUX COM
(RS-422)
MuxBus/LAN/IRIG B
(op on)
GPS Ant.
(TNC)
J3
(SMA)
(SMA)
J5
J4
10MHz OUT
1PPS OUT (TTL)
x17
x1
1PPS IN#1, ICD-GPS-060
1PPS IN#2, RS-422
J1 / J2
J1 / J2
1PPS OUT, ICD-GPS-060
1PPS OUT, TTL
1PPS OUT, RS-422
TOD (HQ) OUT, ICD-GPS-060
Discrete outputs BIT Indica ons
Open collector/Ground
AR51A-09
TOD (HQ) IN, ICD-GPS-060
P(Y) Code GPS keys
x6
x5
x4
Power Supply
Discrete Over All BIT
Rb Test point (factory use)
CLI
(RS-422)
CLI
(RS-232)
Electrical Interface
Page 2 of 8
Vectron Interna onal • 267 Lowell Road, Suite 102, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • h p://www.vectron.com
Rev 1.0 Oct 2014
Performance Specifica ons
Performance
Time (1PPS)
Long Term Accuracy
Long Term Stability
Short Term Stability (ADEV)
Temperature Stability
Disciplined to GPS or to an external synchroniza on source
Time dri without GPS (Hold-Over)
Disciplined to GPS or to external 1PPS
Frequency dri without GPS (Hold-Over / Aging)
≤
3E-11 @ 1s
≤
±3E-10 over -25°C to +65°C (rela ve to +25°C)
(-40°C to +71°C available as an op on)
Offset frequency [Hz]
Phase Noise
Frequency
(10MHz)
Harmonics
Spurious
Warm-up
(accuracy vs. me)
Retrace
(without GPS or other
discipling input)
10Hz
100Hz
1KHz
10KHz
≤-45
dBc (-58 dBc typ.)
<-75 dBc @ ± 100KHz from carrier
Rb Lock (< 1E-9 ) < 5 min
±5E-10 within < 7 min
±5E-11 within < 60 min
±1E-11 within < 4hrs
±1E-12 within < 24 hrs
± 5E-11
Phase noise [dBc/Hz]
≤-114/Hz
≤-140/Hz
≤-146/Hz
≤-150/Hz
50ns RMS @ 25°C (Typical: 30ns RMS)
< ±1μs/24hr (typical)
< ±1E-12 (24 hours average)
±5E-11 / month
GPS Receiver
GPS Type
GPS Tracking
Ephemeris & Almanac
Posi on Accuracy
C (A) Code GPS Receiver
L1 frequency 1575 MHz C/A code (SPS)
12 parallel tracking channels.
Available (Option)
La tude, Longitude: < 6m (CEP 50%)
Al tude: < 11m (CEP 50%)
P (Y) Code GPS Receiver (op on)
L1/L2 frequency P(Y) code SAASM
12 parallel tracking channels
-
PPS: < 12 m CEP
Warm start
≤
1 min (worst case)
Cold start
≤
12.5 minutes (worst case)
≤
30 seconds when receiving the same satellites
constella on (warm or cold start)
Keeping Ephemeris & Almanac. The receiver uses
the ba ery for saving the data for non-opera ng
accumula ve dura on of about 2 years.
5VDC (up to 100 mA)
Acquisi on Time (Typical) (*)
Warm start
≤
45 second
Cold start
≤
50 second (worst case)
Internal backup ba ery
GPS Antenna DC Voltage
N/A
The P (Y) code GPS receiver must be supplied by user.
Power Supply
Input Voltage
Power Consump on
22-32 VDC (28 VDC Typ.) per MIL-STD-704D
< 30 W @ 28 VDC (warm-up)
< 16 W @ 28 VDC @ 25°C (steady-state)
< 20 W @ 28 VDC @ -25°C (steady-state)
Dimensions & Weight
Dimensions
Weight
175 mm (d) x 132 mm (w) x 56 mm (h)
C / A code GPS receiver
C / A code GPS receiver and LAN / 1553 board:
P / Y code GPS receiver, back up battery and LAN / 1553 board
≤
1.2 Kg
≤
1.3 Kg
≤
1.5 Kg
Page 3 of 8
Vectron Interna onal • 267 Lowell Road, Suite 102, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • h p://www.vectron.com
Rev 1.0 Oct 2014
Performance Specifica ons
(con
Environmental
Temperature
Temperature Al tude
Humidity
2.45gRMS as per the following profile:
nued)
Opera ng: -25°C to +65°C (op on for -40°C to +65°C)
Emergency: +71°C for 30 minutes
Storage: -40°C to +85°C
0 to 50,000
95% non condensing
Random Vibra on
Mechanical Shock - Opera on
Mechanical Shock - crash
Bench Handling Shock
Rain
Dust
Salt Atmosphere
Bonding
EMI / RFI
MIL-STD-810C/E, Method 516.2, Proc. 1 (30g / Half sine / 3 axis / 6 shocks per axis)
X-40G, Y-15G, Z-20G, 11ms, Half Sine, Total 12 shocks
MIL-STD-810F, Method 516.5, Procedure VI
MIL-STD-810E Method 506.3 procedure I
MIL-STD-810E Method 510.3
MIL-STD-810E, Method 509.3, Procedure I
≤2.5
mΩ
MIL-STD-461B/C Part: 5 (CE01, CE03, CE07, RE02, CS01, CS02, CS06, RS02, RS03)
Reliability, Maintainability, Testability
MTBF
MTTR – O Level
BIT (Built In Test)
> 16,000 hours @ 30°C, ARW, MIL-HBK-217F (for C/A GPS receiver)
> 3,700 hours @ 30°C, ARW, MIL-HBK-217F (for P/Y GB-GRAM)
12 minutes to replace failed unit (including warm-up time)
On-line BIT – Automa c, Covers > 90% of all failures
Principles of Opera on
The following block diagrams depict the opera on of the AR51A-09. The unit includes Rubidium Standard and accepts Input from internal
GPS receiver, external 1PPS or external TOD (H.Q). All outputs are derived from the internal Rubidium Clock, which is phase locked by a
digital PLL to the selected input. Thus, the Rubidium Clock - frequency and me - follows the GPS on the long term average. If GPS recep on
is lost for short or long periods of me the Rubidium Clock shall maintain accurate me and frequency with no phase interrup on.
Data
fl
ow & Inputs Selec on
Rubidium-GPS DPLL and Inputs
Page 4 of 8
Vectron Interna onal • 267 Lowell Road, Suite 102, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • h p://www.vectron.com
Rev 1.0 Oct 2014
Performance Specifica ons
(con
Typical Performance Plots
nued)
Typical me error
fl
uctua ons when disciplined to GPS
Typical me error in Holdover (without GPS)
Graphic User Interface (GUI) So ware for PC (Op on)
GUI for PC is available: parameters se ngs (like: me, date, unit configura on etc’), monitoring (like: BIT status) and data presenta on (like:
me, date, posi on etc’)
Page 5 of 8
Vectron Interna onal • 267 Lowell Road, Suite 102, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • h p://www.vectron.com
Rev 1.0 Oct 2014
DSP 与 ARM 处理器
