Abstract:

Orthogonal waveforms are used as transmitting waveforms for multiinput multioutput (MIMO) radar. Chaotic sequences can generate orthogonal chaotic phase coding waveforms of arbitrary length and arbitrary number of waveforms in short time. Using chaotic phasecoding waveforms as transmitting signals, pulse compression outputs have high range sidelobes level because of the high crosscorrelation and autocorrelation sidelobes. A method is proposed to search for the optimal complementary waveforms of the transmitted chaotic phasecoding waveforms by the genetic algorithm and the iterative algorithm, so the complementary transmitting structure can suppress these high output range sidelobes effectively. And then the target detection performance of MIMO radar is improved,  especially for the close small target. Simulations based on four frequently used chaotic sequences are compared with waveforms of concerned literatures, which show the effectiveness of the proposed method.