Annex 3 to Appendix 1 "Auto Tracking"Sensor Errors
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Statutory Documents - IMO Publications and Documents - Resolutions - Maritime Safety Committee - Resolution MSC.64(67) - Adoption of New and Amended Performance Standards - (Adopted on 4 December 1996) - Annex 4 - Recommendation on Performance Standards for Radar Equipment. LR Note: See also MSC.192(79) - Appendix 1 Performance standards for "Auto Tracking" - Annex 3 to Appendix 1 "Auto Tracking"Sensor Errors

Annex 3 to Appendix 1 "Auto Tracking"Sensor Errors

 The accuracy figures quoted in paragraph 3.7 of the Appendix are based upon the following sensor errors and are appropriate to equipment complying with the performance standards for shipborne navigational equipment.

Note δ means "standard deviation".

Parent topic: Appendix 1 Performance standards for "Auto Tracking"

Radar

 Target glint (scintillation) (for 200 m length target)

Along length of target δ = 30 m (normal distribution)

Across beam of target δ = 1 m (normal distribution)

Roll-pitch bearing. The bearing error will peak in each of the four quadrants around own ship for targets on relative bearings of 045°, 135°, 225° and 315° and will be zero at relative bearings of 000°, 090°, 180° and 270°.

This error has a sinusoidal variation at twice the roll frequency.

For a 10° roll the mean error is 0.22° with a 0.22° peak sine wave superimposed.

Beam shape - assumed normal distribution giving bearing error with δ = 0.05°

Pulse shape - assumed normal distribution giving range error δ = 20 m

Antenna backlash - assumed rectangular distribution giving bearing error ± 0.05° maximum

Quantization

 Bearing - rectangular distribution ± 0.1° maximum

Range - rectangular distribution ± 0.01 nautical miles maximum

Bearing encoded assumed to be running from a remote synchro giving bearing errors with a normal distribution δ = 0.03°.

Gyro-compass

 Calibration error 0.5°

Normal distribution about this with δ = 0.12°

Log

 Calibration error 0.5°

Normal distribution about this, 3δ = 0.2 knots.
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