Robust source DOA estimation method suitable for MIMO-SAR echo separation

Abstract

The application discloses a kind of suitable for MIMO-SAR echo separation robust signal source angle of arrival estimation method, it includes the following steps: S1: design MIMO-SAR short time shift orthogonal transmission waveform, and collect the echo data under the mode of multiple launch multiple reception;S2: based on multi-channel receiving data constructs pitch dimension space fast sampling signal, and selects distance sample and estimates multi-view covariance matrix;S3: based on feature decomposition determines the number of signal components in the unit to be processed;S4: according to MIMO-SAR geometry configuration and short time shift orthogonal waveform characteristics, the range of angle of arrival of signal component is determined, and over-complete base is constructed accordingly;S5: for further improve the accuracy of angle of arrival estimation, based on the multi-view covariance matrix in S2, establish sparse reconstruction model, and based on the number of signal sources in S3, the accurate estimation of signal source angle of arrival is realized.The signal source angle of arrival estimation method provided in the application helps to improve the echo separation performance of MIMO-SAR in the terrain undulating scene, and then improves its imaging quality.

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