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Multi-target positioning method of bistatic multi-input multi-output radar

A multi-target positioning and multi-input technology, applied in the direction of radio wave reflection/re-radiation, utilization of re-radiation, measurement devices, etc., can solve unfavorable real-time processing and hardware implementation, high computational complexity, and convergence of low-beat sampling conditions Slow and other problems, to achieve the effect of facilitating real-time processing, speeding up calculation, avoiding spatial spectrum search and eigenvalue or singular value decomposition

Inactive Publication Date: 2011-07-27
HARBIN ENG UNIV
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Problems solved by technology

Since MIMO radar can form a very long virtual array, a high-dimensional covariance matrix of received data is obtained. The above algorithms perform eigenvalue decomposition on the covariance matrix with very high computational complexity, and converge under low-beat sampling conditions. Slow, high computational complexity, not conducive to real-time processing and hardware implementation

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Embodiment Construction

[0086] The present invention will be described in more detail below in conjunction with target positioning flow chart and multi-stage Wiener filtering signal processing flow chart

[0087] Step 1: Perform matched filtering on the echo signal of the target

[0088] 1. MIMO radar receives echo signal

[0089] Suppose the MIMO radar has M transmitting elements and N receiving elements, d t and d r are the transmitting and receiving array element distances, respectively. Each transmitting array element transmits the same-frequency and orthogonal periodic phase-encoded signals at the same time. Then the echo signal received by the MIMO radar is

[0090]

[0091] In the formula output vector for receive array; (.) T Represents the transpose of a vector or matrix; θ t and θ r are the emission angle and reception angle, respectively; is the receiving steering vector. λ is the wavelength of the carrier; diag(α) represents the vector Constituted pλp diagonal matrix, whe...

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Abstract

The invention provides a multi-target positioning method of a bistatic multi-input multi-output radar, comprising the following steps of: (1) transmitting mutually orthogonal phase-coded signals by M transmitting array elements, and receiving the phase-coded signals by N receiving array elements, wherein the distances of the M transmitting array elements and the N receiving array elements are all of half wavelengths; (2) carrying out matched filtering on the received phase-coded signals by a matched filter of a receiver of each receiving array element; (3) carrying out multistage Wiener filtering on a matched signal data covariance matrix space, and carrying out forward recursion to obtain a signal subspace; (4) carrying out high-resolution DOA (Direction of Arrival) estimation by using an ESPRIT algorithm, wherein a pairing algorithm is used for carrying out the automatic pairing on two-dimensional parameters; and (5) realizing multi-target positioning according to cross points at two angles so as to obtain the positions of space targets. The multi-target positioning method provided by the invention has the advantages of low computation complexity, high computation speed, high estimation accuracy and can be used for positioning the sea-surface or low-altitude targets during tracking and guidance.

Description

technical field [0001] The invention relates to a radar positioning method, in particular to the application of a multiple-input multiple-output type system, specifically a multi-target rapid positioning method for a multiple-input multiple-output co-location MIMO radar system. Background technique [0002] Multiple-input multiple-output (MIMO) radar is a new system radar with high detection performance and survivability based on the multiple-input multiple-output technology in the communication field. Compared with traditional radar, MIMO radar uses signal diversity technology to form a large virtual array aperture, which improves the spatial resolution of the detection target; uses space diversity technology to suppress the scintillation characteristics of the target. And carrier suppression has great advantages. At present, MIMO radars are mainly divided into two categories, one is statistical MIMO radars, the space diversity information of the target RCS can be obtained...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/06G01S7/02
Inventor 王伟王咸鹏李欣郝燕玲徐定杰马跃华
Owner HARBIN ENG UNIV
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