Bistatic expansion co-prime array MIMO radar DOD and DOA dimension reduction estimation method

Abstract

The invention relates to the technical field of radars, and in particular relates to a bistatic expansion co-prime array MIMO radar DOD and DOA dimension reduction estimation method. The method is based on a bistatic expansion co-prime array MIMO radar array structure. A bistatic expansion co-prime array MIMO radar departure angle and arrival angle joint estimation method based on a dimension reduction multi-signal classification algorithm is provided. According to the method, by adding constraints and constructing a cost function, a two-dimensional spectral peak search maximum value in a two-dimensional MUSIC algorithm is converted into a one-dimensional optimal value with constraints, DOA and DOD are obtained in sequence, and the DOD and the DOA are automatically paired. The introductionof the dimensionality reduction idea enables the algorithm to be free of two-dimensional search, so that the complexity is significantly reduced; due to the larger array aperture of the expansion co-prime array and the virtual array formed with the MIMO radar, the performance of the method is excellent in all aspects. In addition, the problem of phase ambiguity possibly caused by the fact that the array element distance is larger than half wavelength is solved through co-prime of the number of sub-arrays.

Description

technical field [0001] The invention relates to the technical field of radar, in particular to a DOD and DOA dimension reduction estimation method for a bistatic expansion coprime array MIMO radar. Background technique [0002] The application of MIMO technology in communication significantly improves the channel capacity and reliability under fading channels, and is one of the core technologies in the field of wireless communication. Inspired by MIMO technology, researchers began to think about whether MIMO technology can be applied to radar systems. In 2003, Bliss and Forsythe of Lincoln Laboratory in the United States first proposed MIMO radar. The characteristic of MIMO radar technology is that the transmit array and the receive array are equipped with multiple antennas for orthogonal signal transmission and far-field signal echo reception, and are divided into transceiver co-location single base and transceiver single base according to whether the transceiver array is a...

AI Technical Summary

Problems solved by technology

Although traditional subspace algorithms such as MUSIC and ESPRTT algorithms can be applied to the angle estimation of bistatic MIMO radar, they have the problem of low estimation accuracy under low signal-to-noise ratio, and the ESPRTT algorithm uses the characteristic of rotation invariant factor, which is only applicable to equidistant line array

The traditional method of performing a two-dimensional search on the accumulated receiver matched filter output signal to determine the DOD and DOA by finding the peak has the problems of large calculation and low positioning accuracy, which seriously limits its application in actual radar systems

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