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The following combination of characteristics gives best screen picture in a primary search radar:
  • A
    Short pulse length and narrow beam.
  • B
    Long pulse length and narrow beam.
  • C
    Short pulse length and wide beam.
  • D
    Long pulse length and wide beam.

To achieve optimum range and range discrimination, some parameters must be optimized. To discriminate between objects in azimuth the beam-width has to be set. However, to discriminate in range, the transmission of the pulse length has to be set. This provides the ability to detect separate targets on the same azimuth

The antenna size governs the beam-width of the pulses. This greatly influences the abilities to discriminate between targets in azimuth. Since narrower beams can scatter the scanned area more. A wider beam may detect two objects in close proximity as one reflection of pulses.

A longer pulse has the disadvantage of discrimination along azimuth.

  • The best combination for best results is short pulse length and a narrow beam.

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