AR81 GNSS 

Ground Segment Unit for GNSS programs

AR81-Front-and-back

Proven connection from
deep space to gound consols

AR-81 is a 1U, 19” rack-mount ultra-high stability and ultra-low phase noise Rubidium Frequency Standard specifically designed for ground segments of GNSS systems. AccuBeat’s AR81 was developed specifically for Europe’s GALILEO GNSS program and is currently deployed and operational in more than 50 locations. The unit includestwo hot redundant power supplies for high MTBF (>500,000 Hrs @25°C). BIT status showed by the front panel LEDs and via RS-232 communication port. Frequency calibration available via RS-232.

Product Highlights

5E-11/monthly
Frequency Stability

 <-120dBc/Hz @10KHz
Phase Noise

<-40 dBc
Harmonics

Performance

Performance
SpecificationMeasured performance
Long Term Stability<5E-11 / monthly
<5E-10 / yearly
Short Term Stability<3E-11 @ 1sec
<1E-11 @ 10sec
<3E-12 @ 100sec
<2.5E-12 @ 1000sec
<2E-12 @ 10000sec
9E-12@1Sec
4E-12@10sec
2.2E-12@100Sec
8.3E-13@1,000Sec
1.2E-12@10,000Sec
Temperature
Stability
< 3E-10 / 0°C to +50°C
FrequencyPhase Noise<-94 dBc/Hz @ 1Hz
<-126 dBc/Hz @ 10Hz
<-144 dBc/Hz @ 100Hz
<-150 dBc/Hz @ 1KHz
<-150 dBc/Hz @ 10KHz
-100 dBc/Hz @ 1Hz
-130 dBc/Hz @ 10Hz
-149 dBc/Hz @ 100Hz
-156 dBc/Hz @ 1KHz
-156 dBc/Hz @ 10KHz
Harmonics< -40 dBc-44dBc
Spurious @ 100kHz< - 60 dBc-100dBc
Warm-upTime to lock : < 5 min3.2 min
Time to <1E-9: < 8 min5 min
Level1Vrms (11-14 dBm)
Retrace±5E-11
Accuracy
@ shipment
< ±5E-11
Maximum clock drift±10E-9 Sec / Sec
Magnetic FieldDC (±2 gauss)
Magnetic Sensitivity< 4E-11 / gauss

Additional product specifications, outline drawings and block diagrams and test data are available on request.

Key Features

  • Ultra high stability: 2E-12@10,000 Sec
  • Ultra low phase noise: -94dBc@1Hz, - 150dBc@1kHz
  • Aging: 5E-11/month
  • 6 outputs of 10MHz sine wave
  • High MTBF: > 500,000 Hrs @ 25°C
  • Supply Voltage: 90-260 VAC

Key Applications

  • Ground segments of GNSS systems
Operator's seat for ground mobile radar control

Customized configurations are available, contact us to learn more.

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