A stationary CW radar operating at 5 GHz. What is the Doppler frequency shift, if the target is moving at 108 km/hr speed?

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ISRO VSSC Technical Assistant Electronics 2018 Official Paper
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  1. 3.6 kHz
  2. 1000 Hz
  3. 500 Hz
  4. 1800 Hz

Answer (Detailed Solution Below)

Option 2 : 1000 Hz
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Detailed Solution

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Doppler Effect:

The Doppler Effect is the change in the observed frequency of a wave when the source or the detector moves relative to the transmitting medium.

The following equation can be used to calculate the Doppler frequency shift (D):

Calculation:

Given:

v = 108 km/hr = 30 m/sec

fcarrier = 5 GHz = 5 × 109 Hz

Also, c = 3 × 108 m/s

The Doppler frequency shift will be:

D = 1000 Hz

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