1.4 These standards cover the basic requirements of position-fixing for navigation purposes only and does not cover other computational facilities which may be in the equipment.
2 GLONASS RECEIVER EQUIPMENT
2.1 The words "GLONASS receiver equipment" as used in these performance standards include all the components and units necessary for the system to properly perform its intended functions. The equipment should include the following minimum facilities:
.1 antenna capable of receiving GLONASS signals;
.2 GLONASS receiver and processor;
.3 means of accessing the computed latitude/longitude position;
.4 data control and interface; and
.5 position display and, if required, other forms of output.
2.2 The antenna design should be suitable for fitting at a position on the ship which
ensures a clear view of the satellite constellation.
3 PERFORMANCE STANDARDS FOR GLONASS RECEIVER EQUIPMENT
3.1 The GLONASS receiver equipment should:
.1 be capable of receiving and processing the Standard Positioning Service (SPS) signals of the GLONASS system and provide position information in latitude and longitude SGS-90 co-ordinates in degrees, minutes and thousandths of minutes and time of solution referenced to UTC (SU). Means should be provided to transform the computed position based upon SGS-90 into WGS 84 or into data compatible with the datum of the navigational chart in use. Where this facility exists, the display should indicate that the co-ordinate conversion is being performed and should identify the co-ordinate system in which the position is expressed;
.2 operate on the SPS (on lettered L1 frequencies and C 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 SGS-90 or 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 position (HDOP) ≦ 4 (PDOP ≦ 6);
.5 have dynamic accuracy such that the position of the antenna is determined to within 100 m (95%) with HDOP) ≦ 4 (PDOP ≦ 6) under the conditions or sea states and ship's motion likely to be experienced in ships;*
*Rerer to resolution A.694(17) and IEC Publications 721-3-6. 945 and 1108-2.
