Angle estimating method for bistatic MIMO radar non-circular target under mutual coupling conditions

Abstract

The invention provides an angle estimating method for a bistatic MIMO radar non-circular target under mutual coupling conditions. The method includes the following steps: a receiving array element receives mutually orthogonal non-circular signals emitted by an emitting array element, wherein, both the receiving array element and the emitting array element are uniform linear arrays with half wavelength; matched filtering is performed on the received non-circular signals through a matched filter of a receiving array element receiver; decoupling operation is performed on matched signal data, andthe decoupling operation is performed in a tensor domain; augmented tensor is constructed by utilizing a non-circular and multidimensional structure of the decoupled signal data in the tensor domain;high-order singular value decomposition is performed on the augmented tensor so that signal subspace can be obtained; and according to the obtained signal subspace, estimation is performed on the emitting angle and receiving angle of a target by combining a rotation invariant matrix, so that the angle estimation of the target can be obtained.

Description

technical field [0001] The invention relates to the field of radar technology, in particular to a method for estimating the angle of a bistatic MIMO radar non-circular target under the condition of mutual coupling. Background technique [0002] In recent years, the concept of multiple-input multiple-output radar has attracted great attention of scholars in the field of radar research. Since MIMO (Multiple-Input Multiple-Output) radar transmits orthogonal waveforms and has different transmit and receive array arrangements, MIMO radar can simultaneously obtain space diversity and waveform diversity. For angle estimation, MIMO radar has better parameter estimation performance than traditional phased array radar, especially for joint direction (DOD, Direction Of Departure) and direction of arrival (DOA, Direction Of Arrival) estimation. Generally speaking, the research on MIMO radar is mainly divided into two categories, one of which is statistical MIMO radar, which can obtain ...

AI Technical Summary

Problems solved by technology

This method constructs a special augmented tensor to capture the non-circular characteristics and multi-dimensional structure of non-circular signals, which improves the performance of angle estimation; meanwhile, it eliminates the influence of mutual coupling in the tensor domain, and solves the problem of array in practical applications. There is a problem of mutual coupling between elements, which is conducive to the real-time positioning of the target and the realization of practical applications

Images