Performance Standards of RADAR:

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  1. Vertical Beam Width: Radar should function without any deterioration in performance when the vessel is rolling or pitching up to 土 10 deg. In commercial marine RADAR sets VBW is between 15 - 30 deg.
  2. Horizontal Beam Width: When vessels are at same range, but slightly different bearing, they should appear as 2 distinct targets on PPI. HBW is between 0.6 - 2.0 deg.
  3. Range Discrimination: Two smaller similar objects on the same bearing separated by 40 mtr in range, should be separately indicated when using a range scale of 1.5M or less when they lie between 50% and 100% of the range scale in use.
  4. Bearing Discrimination:  Two targets should be separately visible when the lie on the same range by 2.5 deg.
  5. Minimum Range: The Minimum detection scale, with a scanner 15 mtr high, shall not exceed 40 mtr. Targets between 40 mtr and 1M should be displayed without resetting any control other than range selection.
  6. Range Accuracy: The error in a range of an object, obtained using range rings or the VRM, should not exceed 1% of the maximum range scale in use or 30 mtr whichever is greater.
  7. Bearing Accuracy: The RADAR bearing of an object, whose echo appears on the edge of the display, should be capable of being measured with an accuracy equal to or better than 土1 deg.
  8. Scanner: The scanner must rotate at a constant RPM of not less than 20 (Start and Stop) in relative wind speed up to 100 kts.
  9. Range Selector: The Range Scales should be available are 0.25M, 0.5M, 0.75M, 1.5M, 3M, 6M, 12M & 24M.
  10. Performance Monitor: The RADAR set must have a means of ascertaining its overall performance.
  11. Table depicting Detection Range scales of various targets by 3cm and 10cm RADAR.


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