Abstract:

The orthogonal code division waveform (OCDW) set, due to the same carries transmitted from each arrays, is more suitable for multiple-inputmultiple-output (MIMO) radar, compared with the orthogonal frequency division waveform (OFDW) set. However, the OCDW sets’ correlation property are far from being good. To address this, a method of coding orthogonal phase-code is proposed. This method achieves orthogonality by forcing the value of cross-correlation function cyclical located equidistantly on the unit circle. Further, the influence of Doppler frequency on the proposed waveform’s orthogonality is studied and the channel-ambiguity and narrowing of no-folding in Doppler domain are analyzed. To eliminate the undesired effect caused by Doppler shift, Doppler-compensation and rangeDoppler (RD) mapping are suggested, according to the characteristic of backscattered wave. Simulation results show that the proposed waveform set enjoys good orthogonality, and the proposed processing approach would eliminate the undesired effect caused by Doppler shift.