Array element defect MIMO radar angle estimation method based on signal subspace reconstruction

Abstract

The invention provides an array element defect MIMO radar angle estimation method based on signal subspace reconstruction, which comprises the following steps: step 1, performing characteristic decomposition on a covariance matrix of an array element defect bistatic MIMO radar to obtain a signal subspace matrix, so as to reduce the dimension of the data matrix to be recovered, every M rows of dataform each signal subspace block matrix from top to bottom in the signal subspace matrix, and N signal subspace block matrices are formed in total, wherein M and N are the number of transmitting arrayelements and the number of receiving array elements respectively; step 2, according to the correlation among the signal subspace block matrixes, forming a low-rank block Hankel matrix from all the signal subspace block matrixes, and reconstructing the low-rank block Hankel matrix through an indefinite augmented Lagrangian multiplier method to recover the missing data in the block Hankel matrix, so as to obtain a complete signal subspace matrix; step 3, estimating the target angle by using an ESPRIT algorithm according to the complete signal subspace matrix.

Description

technical field [0001] The invention belongs to the technical field of radar, and in particular relates to a method for estimating the angle of an array element defect MIMO radar based on signal subspace reconstruction. Background technique [0002] Multiple-Input Multiple-Output (MIMO) radar is a new radar system developed on the basis of digital array radar, multistatic radar and modern communication technology. Compared with traditional phased array radar and multistatic radar, MIMO radar has significant technical advantages and great development potential, and has become a research hotspot in the radar field. MIMO radar uses multiple transmitting antennas to simultaneously transmit mutually orthogonal signals to illuminate the target, and then uses multiple receiving antennas to receive the echo signals reflected by the target. Since multiple orthogonal transmitting signals can maintain their independence in space, MIMO radar can use virtual array element technology to ...

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Problems solved by technology

[0010] Aiming at the deficiencies of the above-mentioned prior art, the object of the present invention is to provide a method for estimating the angle of MIMO radar with array element defect based on signal subspace reconstruction, which overcomes the problem of partial receiving array element defect in bistatic MIMO radar. The problem of performance deterioration or even failure of target angle estimation method for space-based algorithms

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