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What type of waveform must be transmitted to reduce Doppler shit errors?

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What type of waveform must be transmitted to reduce Doppler shit errors?

(a) Square

(b) Triangular

(c) Sine

(d) Cosine

The question was asked in homework.

Asked question is from Radar Altimeter topic in portion Celestial Navigation, Doppler and Altimeter Radars of Avionics

1 Answer

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Best answer
The correct choice is (b) Triangular

Best explanation: To reduce the errors due to the Doppler shift of the return, a triangular waveform is usually used to modulate the transmitter. Thus a positive Doppler shift will produce a negative frequency error on the rising modulation slope. By averaging the frequency count the error can be minimized.

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