Nonlinear complementary waveform sets for clutter suppression

In this chapter we show how waveforms can be constructed which have true complementary behavior when non-linear singnal processing is used at the receiver. We call such waveforms square-complementary, since they have the property that the sum of the squares of their autocorrelations are zero at non-zero lags. In addition, by moving from square-complemtary pairs to square-complemtary quads the complementary behavior can be can be made Doppler tolerant over the range of Doppler shifts normally encountered in radar systems. The remainder of this chapter introduces complementary, square-complementary and mutually orthogonal code sets. Waveform construction via pulse code modulation is discussed, and multiplexing in time and frequency is examined. Applications of complementary coded signals to communications and radar are considered