Colocated MIMO radar sidelobe suppression using random space-time coding

For colocated multiple-input multiple-output (MIMO) radar transmitting orthogonal polyphase coded waveform, a low range, angular and Doppler sidelobe is desirable. In this paper, we propose a MIMO radar sidelobe suppression method based on random space-time coding (STC) method. In detail, at each pulse repetition period, a random STC matrix, composed of a diagonal random phase matrix multiplied by a random permutation matrix, is modulated to waveforms before transmission. Such a kind of STC matrix can keep the constant modulus property of transmitting waveforms and can decrease range, angular and Doppler sidelobe significantly.