Technical Specifications - Nexcom nROK 7251 Series User Manual

Appendix C: GPS with Dead Reckoning Feature

Technical Specifications

Parameter Specification
Receiver type 72-channel u-blox M8 engine
GPS L1C/A, SBAS L1C/A, QZSS L1C/A
GLONASS L1OF, BeiDou B1, Galileo E1B/C
GNSS
Time-To-First-Fix
3 Cold start
Hot start
Aided starts
Sensitivity
6 Tracking &
Navigation
Reacquisition -159 dBm
Cold start
Hot start
Navigation
Horizontal Position Autonomous 2.5 m
accuracy
8
SBAS
Velocity accuracy
9
Heading accuracy
9
ADR position error 10 Gyro + speed pulse +
accelerometer
Frequency of time
pulse signal
Maximum navigation
rate
(High Rate output)
11
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2
GPS & GPS &
GPS
GLONASS BeiDou
27 s 28 s 30 s
1.5 s 1.5 s 1.5 s
4 s 6 s 3 s
4 5
-160 dBm -160 dBm -160 dBm
7
-159 dBm -159 dBm
-147 dBm -147 dBm -147 dBm
-156 dBm -156 dBm -156 dBm
GPS & GPS &
GPS
GLONASS BeiDou
2.5 m 2.5 m
2.0 m 2.0 m 2.0 m
0.05 m/s 0.05 m/s 0.05 m/s
0.3 degree 0.3 degree 0.3 degree
typ. 3 % of distance
travelled without GNSS
0.25 Hz ... 10 MHz
20 Hz
Navigation
Maximum navigation
rate
(Measurement rate)
Navigation latency
12
Maximum sensor
measurement
message output rate
Sensor measurement
message output
bandwidth
13
Accuracy of time
pulse signal
RMS 99%
Operational limits
Dynamics
Altitude
Velocity
2 Ready to support Galileo E1B/C when available with a flash firmware update
All signals at - 130 dBm
3
4 Dependent on aiding data connection speed and latency
5 BeiDou assisted acquisition is not available
Demonstrated with a good external LNA
6
7 Optimized for best navigation performance with dead-reckoning
8 GNSS fix available, CEP, 50%, 24 hours static, -130dBm, > 6 SVs
GNSS fix available, 50% @ 30 m/s
9
Typical road and vehicle conditions
10
11 For update rates > 2 Hz, extrapolation techniques are applied.
Dependent on signal conditions but measurements are delivered with time-stamp corresponding
12
to measurement time
Higher bandwidths are used for navigation
13
14 Assuming Airborne < 4 g platform
68
GPS & GPS &
GPS
GLONASS BeiDou
2 Hz
300 ms nominal
10 Hz
nominal 50% of output
rate
30 ns 30 ns 30 ns
60 ns 60 ns 60 ns
≤ 4G
50,000m
500 m/s
nROK 7251 Series User Manual