Multi-target location method of bistatic common-address multi-input-multi-output radar

Abstract

The invention provides a multi-target location method of a bistatic common-address multi-input-multi-output radar. The method comprises the following steps of: transmitting mutual orthogonal phase coded signals by M transmitting array elements; receiving the phase coded signals by N receiving array elements; performing matching filtering on the received phase coded signals by a matching filter ofeach receiver which is used for receiving the array elements; reconfiguring covariance matrix of signal data subjected to matching filtering; performing unitary transformation on the reconfigured covariance matrix to obtain the covariance matrix of a real number field; performing singular value decomposition on the covariance matrix of the real number field; estimating emission angles and acceptance angles of a plurality of objects by utilizing actual value combination spinning invariant factor; and realizing multi-target location according to a cross point of the two angles to obtain the position of a space object. According to the method, the combination spinning invariant factor is adopted to reconfigure the receiving data so as to improve the estimation performance of an object; and the covariance matrix of the real number field is obtained through unitary transformation, and characteristic decomposition is performed on the covariance matrix of the real number field so as to be favorable for real-time processing and realization on hardware.

Description

technical field [0001] The invention relates to a radar target positioning technology, in particular to a multi-target 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 the traditional MIMO radar, MIMO radar transmits mutually orthogonal waveforms at the transmitting end, and can form a large virtual array aperture through matched filtering at the receiving end, which improves the spatial resolution of detecting targets. MIMO radar can use the widely distributed arrangement of array elements to obtain space diversity characteristics and suppress the shortcomings of target scintillation. At present, MIMO radar is mainly divided into the following two types. One is co-site MIMO radar. The array elemen...

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Problems solved by technology

Since most of the above need to apply the MUSIC algorithm or ESPRIT algorithm principle to the transmitter and receiver at the same time to estimate the target’s launch angle and rece

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