Antenna Scan Rate

• Affects probability of detection and data rate

• Number of returns = Beamwidth x PRF / Scan Rate

• EXAMPLE: PRF =280 pulses / second

Beam Width =3.4 degrees

Scan Rate =6 RPM (Long Range)

=1 revolution in 10 sec

=36 degrees / second

Beam Width x PRF = Total Pulses

Scan Rate

3.4 degrees x 280 pulses / second = 26 pulses

36 degrees / second

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Does the operator understand what happens when the scan rate is changed? Higher scan rate gives better short range detection at the expense of long range detection.