1.

What type of waveform must be transmitted to reduce Doppler shit errors?(a) Square(b) Triangular(c) Sine(d) Cosine

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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