Range accuracy and Bearing accuracy, Factors that affect

Range accuracy and Bearing accuracy, Factors that affect

Range accuracy and Bearing accuracy
Range and bearing accuracy requirements:
Range – within 30 m or 1% of the range scale in use, whichever is greater;
Bearing – within 1°.

Factors that affect range accuracy are:
Height of scanner.
Range scale.
Pulse length.
PPI curvature.

Factors that affect bearing accuracy are:
Correct alignment between the heading marker and the scanner.
Correct alignment between the heading marker and the bearing scale.
Gyro error, if any when the display is Gyro-stabilised.
Beamwidth distortion.