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MIMO radar broadband DOA calculation method based on sparse array in clutter environment

A technology of sparse array and calculation method, applied in the field of signal processing, which can solve problems such as large performance impact

Active Publication Date: 2019-12-17
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, CSSM needs to estimate the target DOA, and the performance is greatly affected by the prediction accuracy.

Method used

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  • MIMO radar broadband DOA calculation method based on sparse array in clutter environment
  • MIMO radar broadband DOA calculation method based on sparse array in clutter environment

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Embodiment Construction

[0050] For the convenience of description, first define the following:

[0051] Bold uppercase letters indicate matrices, bold lowercase letters indicate vectors, ( ) * is the conjugate, (·) T For the transpose, ( ) H is the conjugate transpose, ||x|| 0 and ||x|| 1 denote the l of the vector x respectively 0 Norm and l 1 Norm, ||W|| 0 Represents the number of non-zero rows of matrix W, Diag{} represents a block diagonal matrix, diag r {} represents the diagonal matrix after removing zero rows, Indicates the expectation relative to θ, I N is a unit matrix of order N, 1 is a vector of all 1s, and the symbol ⊙ represents the Hadamard product.

[0052] Consider a co-located MIMO radar system where both the transmit and receive antennas are placed on the abscissa of a two-dimensional Cartesian coordinate system. Suppose there are M transmitting antennas, and the position on the horizontal axis is known, which is d t,m (m=1,...,M). Assume that the feasible region for pl...

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Abstract

The invention discloses an MIMO radar broadband DOA calculation method based on a sparse array in a clutter environment. The MIMO radar broadband DOA calculation method belongs to the field of singleprocessing, and specifically refers to WCSAB. According to the MIMO radar broadband DOA calculation method, clutter interference is suppressed by means of Capon beam forming, and then a target DOA isestimated by jointly using a CS method through utilizing different narrowband signal information. Considering that DOA estimation performance is not only related to a beamforming weight value, but also relates to a sparse array structure, the invention proposes a joint optimization problem of the beamforming weight value and the sparse array, and provides a simple algorithm to solve the optimization problem. According to the MIMO radar broadband DOA calculation method provided by the invention, the estimation performance including high resolution and low sidelobe of the target DOA in the clutter environment can be improved, the sparse array reduces the system cost and complexity, a Bayesian mean square error estimated by means of the target DOA is used as a performance evaluation index, and the sparse array structure designed by adopting the algorithm is similar to the optimal sparse array obtained through an exhaustion method in performance and is superior to a nested array and a co-prime array in performance.

Description

technical field [0001] The invention belongs to the field of signal processing, and particularly relates to the estimation problem of wideband DOA of MIMO radar based on sparse array in clutter environment. Background technique [0002] MIMO (Multiple Input Multiple Output) radar is a new type of radar system that uses multiple transmitting antennas to transmit signals synchronously, and simultaneously uses multiple receiving antennas to receive echo signals and process them centrally. Compared with traditional phased array radar, MIMO radar has obvious advantages, such as higher resolution, better target detection, positioning and tracking performance, and better target parameter estimation and identification capabilities. The research on DOA estimation is an important part of array signal processing, and its application involves radar, communication, sonar, radio astronomy, survey, earthquake and biomedicine and other fields. There are many classic DOA estimation methods,...

Claims

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Application Information

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IPC IPC(8): G01S3/14G01S7/02G01S7/41
CPCG01S3/143G01S7/023G01S7/414G01S2013/0254
Inventor 何茜任刚强
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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