A Robust Joint Estimation Method of Transmitting and Receiving Angles for Large Array MIMO Radar Targets

Abstract

The invention provides a robust large-array MIMO target transmitting and receiving angle joint estimation method, and belongs to the field of multiple-input multiple-output radar target parameter estimation. The method provided by the invention is based on linear shrinkage and a random matrix theory. Implementation of the method comprises the steps of building a random matrix model of observed data by using echo signals, solving maximum likelihood estimation of a covariance matrix through fixed-point iteration under the non-Gaussian noise background, acquiring robust covariance matrix estimation by using a linear shrinkage technology when the number of transmitting and receiving array elements is greater than the number of snapshots, building a robust cost function by using contour integration, Stieltjes transform and a residue theorem, and performing spectrum peak search on the cost function so as to solve the target transmitting and receiving angle. The method provided by the invention has the advantages that the method has robust estimation performance under the non-Gaussian noise background, and the method is applicable to a large-array system with the number of transmitting and receiving array elements being greater than the number of snapshots at the same time.

Description

technical field The invention belongs to the field of multi-input multi-output (MIMO) radar target parameter estimation; relates to a large array MIMO radar system with the number of receiving and sending elements close to the number of snapshots; and relates to the joint estimation of target receiving and receiving angles of a bistatic MIMO radar under the background of non-Gaussian noise ; Involving the MIMO radar target receiving and receiving angle estimation when the number of transmitting and receiving array elements is greater than the number of snapshots. Background technique Radar (Radar) detects the target by emitting radio waves and determines the spatial position of the target to locate the target. As a new radar system, multiple-input multiple-output (MIMO) radar uses multiple transmitting antennas to simultaneously transmit multiple signals to detect targets, and uses multiple receiving antennas to receive target echo signals. By using a variety of distinguisha...

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Problems solved by technology

The present invention provides a robust method for jointly estimating target receiving and receiving angles of large-array MIMO radars to solve the problem of severe degradation of estimation performance, inability to effectively estimate receiving and receiving angles, and difficulty in jointly estimating target receiving and receiving angles of large-array MIMO radar systems under the background of non-Gaussian noise. The problem

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