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Robust large-array MIMO target transmitting and receiving angle joint estimation method

A radar target and joint estimation technology, applied to radio wave measurement systems, instruments, etc., can solve problems such as inability to effectively estimate the receiving and receiving angle, estimation performance degradation, and difficulty in joint estimation of target receiving and receiving angles in large array MIMO radar systems

Active Publication Date: 2017-09-15
JILIN UNIV
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Problems solved by technology

[0007] 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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  • Robust large-array MIMO target transmitting and receiving angle joint estimation method
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  • Robust large-array MIMO target transmitting and receiving angle joint estimation method

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Embodiment Construction

[0099] figure 1 It is a system model of a bistatic MIMO radar. M transmitting array elements simultaneously transmit narrowband signals to illuminate K far-field targets, and at the receiving end, the echo signals are comprehensively processed by N receiving array elements. In the present invention, the transmitting array and the receiving array are All use uniform linear arrays, and the array element spacing is d t =d r =λ / 2, the transmitting angle is θ, the receiving angle is The transmit angle and receive angle of the k-th target are respectively θ k and The number of snapshots is L. figure 2 It is a flow chart of a large-array bistatic MIMO radar target receiving and receiving angle estimation method based on linear shrinkage and random matrix theory under the background of non-Gaussian noise of Student-T distribution. The specific implementation steps are as follows:

[0100] Step 1: The N receiving array elements at the receiving end of the MIMO radar collect and...

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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 [0001] The invention belongs to the field of multiple-input multiple-output (MIMO) radar target parameter estimation; it relates to a large-array MIMO radar system whose number of receiving and sending array elements is close to the number of snapshots; ; It involves the estimation of the MIMO radar target receiving and receiving angle when the number of receiving and receiving array elements is greater than the number of snapshots. Background technique [0002] Radar (Radar) detects the target by transmitting radio waves and determines the spatial position of the target, thereby locating the target. As a new type of radar, multiple-input multiple-output (MIMO) radar uses multiple transmit antennas to simultaneously transmit multiple signals to detect targets, and uses multiple receive antennas to receive target echo signals. The present invention uses quadrature signals) to introduce target observation channels with different parameters for the radar. Due ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
Inventor 姜宏姚顺优张铭航聂希柱孙晶刘畅庞帅轩李颂董思妍刘美仪
Owner JILIN UNIV
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