GPS Performance Standards
The GPS receiver equipment should:
.1 be capable of receiving and processing the Standard Positioning Service (SPS) signals as modified by Selective Availability (SA) and provide position information in latitude and longitude World Geodetic System (WGS) 84 co-ordinates in degrees, minutes and thousandths of minutes and time of solution referenced to UTC. Means may be provided for transforming the computed position based upon WGS 84 into data compatible with the datum of the navigational chart in use. Where this facility exists, the display should indicate that co-ordinate conversion is being performed, and should identify the co-ordinate system in which the position is expressed.
.2 operate on the L1 signal and C/A code.
.3 be provided with at least one output from which position information can be supplied to other equipment. The output of position information based upon WGS 84 should be in accordance with IEC Publication 1162.
.4 have static accuracy such that the position of the antenna is determined to within 100 m (95%) with horizontal dilution of precision (HDOP) ≤ 4 (or PDOP ≤ 6).
.5 have dynamic accuracy such that the position of the ship is determined to within 100 m (95%) with HDOP ≤ 4 (or PDOP ≤ 6) under the conditions of sea states and ship’s motion likely to be experienced in ships.
.6 be capable of selecting automatically the appropriate satellite-transmitted signals for determining the ship’s position with the required accuracy and update rate.
.7 be capable of acquiring satellite signals with input signals having carrier levels in the range of -130 dBm to -120 dBm. Once the satellite signals have been acquired, the equipment should continue to operate satisfactorily with satellite signals having carrier levels down to -133 dBm.
.8 be capable of acquiring position to the required accuracy within 30 min when there is no valid almanac data.
.9 be capable of acquiring position to the required accuracy within 5 min when there is valid almanac data.
.10 be capable of re-acquiring position to the required accuracy within 5 min when the GPS signals are interrupted for a period of at least 24 h but there is no loss of power.
.11 be capable of re-acquiring position to the required accuracy within 2 min when subjected to a power interruption of 60 s.
.12 generate and output a new position solution at least once every 2 s.
.13 the minimum resolution of position, i.e. latitude and longitude, should be 0.001 minutes.
.14 have the facilities to process differential GPS (DGPS) data fed to it in accordance with the standards of Recommendation ITU-R M.823 and the appropriate RTCM standard. When a GPS receiver is equipped with a differential receiver, performance standards for static and dynamic accuracies (3.4 and 3.5 above) should be 10 m (95%).
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