ComNav G2 - Appendix 1: Specifications; GPS Receiver; DGPS Beacon Receiver (G2 B only)

ComNav G2 & G2B Installation & Operation Appendices
Document PN 29010093 V1.5 - 60 - 16 December 2016
Appendices
Appendix 1
Specifications
GPS Receiver
Parameter Specification
Receiver Type
• Twin receivers, 0.5m antenna separation
• L1, C/A code, with carrier phase smoothing
• 1.575 GHz carrier frequency
Channels Two x 32 parallel tracking GPS, GLONASS,
SBAS
Update Rate
• position: adjustable, 20 Hz max
• heading: adjustable, 20 Hz max
Horizontal Accuracy 1
• < 0.3m 95% confidence when using DGPS
corrections
• < 2.5 m 95% confidence when autonomous
(no SA)
• Datum: WGS 84
Heading Accuracy 2 < 0.25° rms
(Magnetic Variation computations are based on
the World Magnetic Model 2005)
Heave accuracy
○
3
< 30 cm rms
Normal operation: GPS
Coasting (no GPS): Gyro
Pitch accuracy ○
3
< 1° rms
Roll accuracy ○
3
< 1° rms
Rate of Turn 45° per second max.
Start Up time < 60 seconds typical
Heading Fix < 10 seconds typical
Satellite Reacquisition < 1 second
Compass Safe Distance 25cm
Table 13 – GNSS Receiver Specifications
1 Accuracy depends on multipath environment, number of satellites in view and
satellite geometry
2 T he quality of DGPS corrections has no impact on heading performance.
○
3
Based on a 40 second time constant
Note: the performance figures above are based on a minimum of four
visible satellites, HDOP less than 4, PDOP less than 6, high-quality
DGPS corrections and otherwise normal conditions.
Excessive multipath, GPS signal obstructions and/or
interference may reduce the performance.
DGPS Beacon Receiver (G2B only)
Parameter Specification
Channels 2, parallel tracking
Frequency Range 283.5 to 325.0 KHz
Operating Modes Automatic (signal strength or range) and manual
Sensitivity 2.5 dB µ V for 5 dB SNR @ 200 bps
Dynamic Range 100 dB