Experimental study on sensitivity time control for chirp transmission

STC processing for chirp transmission was achieved by installing an additional filter and changing the frequency function of the chirp signal. There is a restriction on the frequency response of the LPF, which can be realized with a small number of inductors and capacitors, so the frequency function f ðtÞ is determined in accordance with the response of the predesigned LPF. As a result, the frequency function becomes a nonlinear function of t. The pulse compression technique based on a quadrature detector [4] cannot be applied to a nonlinear chirp signal, so the cross-correlation must be used for the pulse compression. The calculation cost of the cross-correlation is higher than that of the technique using the quadrature detector, but a state-ofthe-art signal processing device will relieve this problem.