Operating Instructions and Installation Instructions

ComNav Vector G2 & G2B Installation & Operation Appendices
Document PN 29010078 V2.0 - 69 -
DRAFT #3 – 29 May 2009
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 12, parallel tracking
(Two x 10 channels when tracking SBAS)
Update Rate
• position: adjustable, 20 Hz max
• heading: adjustable, 20 Hz max
Horizontal Accuracy 1
• < 1 m RMS when using DGPS corrections
• < 2.5 m RMS when autonomous (no SA)
• Datum: WGS 84
Heading Accuracy 2 < 0.5° RMS
(Magnetic Variation computations are based on
the World Magnetic Model 2005)
Rate of Turn 90° per second max.
Start Up time < 60 seconds typical
Heading Fix < 20 seconds typical
Satellite Reacquisition < 1 second
Compass Safe Distance 1.25 m (standard magnetic compass)
0.80 m (steering magnetic compass)
Compass Safe Distance
(reduced)
0.75 m (standard magnetic compass)
0.50 m (steering magnetic compass)
Table 19 – GPS Receiver Specifications
1 Accuracy depends on multipath environment, number of satellites in view and
satellite geometry
2 The quality of DGPS corrections has no impact on heading performance.
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.
L 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
• 84 channels, automatic or manual
selection
Sensitivity 2.5 dBμV for 5 dB SNR @ 200 bps
Dynamic Range 100 dB
Adjacent Channel
Rejection
61 dB @ ±400 Hz offset
Compliance IEC 61108-4 Beacon Standard
Table 20 – DGPS Beacon Receiver Specifications
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