Reduced-rank STAP method for MIMO array based on estimation of subspace

As the result of the extended virtual array aperture for multiple input multiple output (MIMO) array, the MIMO array can further suppress the clutter and jammer compared with the conventional phased-array. In practice it is difficult to use because of needing more sample support and higher computational complexity. A reduced-rank MIMO space time adaptive processing (STAP) method is proposed based on jammer estimated subspace. The method utilizes the characteristics of the time-limited and band-limited of prolate spheroidal wave function (PSWF) to approximate the clutter subspace. The MIMO system space-time weight is obtained by the "zero-forcing" method, and the covariance matrix containing jammer and noise is acquired through the matched filter orthogonal to all transmitted independent signal waveforms. The simulation results demonstrate that the proposed method can effectively suppress the clutter and jammer and has lower computational complexity.