Monostatic expansion co-prime array MIMO radar DOA estimation method based on MUSIC algorithm

Abstract

The invention provides a monostatic expansion co-prime array MIMO radar DOA estimation method based on a MUSIC algorithm. Firstly, a traditional co-prime array is expanded according to two opposite directions to obtain an expanded co-prime array; the expanded co-prime array is respectively used as a transmitting array and a receiving array of the MIMO radar to transmit and receive signals; the whole receiving array is used as a whole, DOA estimation is carried out by using the receiving data of all receiving array elements, and the self-information and mutual information of the array are simultaneously utilized, so that the degree of freedom and the DOA estimation precision are greatly improved compared with those of a traditional co-prime array DOA method. A traditional co-prime array DOAestimation algorithm usually cannot strictly eliminate the phase ambiguity problem, and due to the fact that MIMO radar is introduced into the algorithm, the condition for generating phase ambiguityis extremely strict, and the algorithm is strict and free of phase ambiguity.

Description

technical field [0001] The invention belongs to the field of array signal processing, and is mainly aimed at the application scene of a radar direction finding system, and the main application is high-precision direction finding of the incoming wave direction in the radar direction finding system, that is, direction of arrival estimation. Specifically, it relates to the DOA estimation algorithm for monostatic expansion coprime array MIMO radar based on the MUSIC algorithm. Background technique [0002] Direction of Arrival (DOA) estimation is an important part of array signal processing, and has important applications in wireless communication, radar, medical images, sonar, etc. Multiple Input Multiple Output (MIMO) radar is a new system radar, which was first proposed by Bliss and Forsythe of Lincoln Laboratory in the United States in 2003. Using MIMO antenna technology, the transmitter is equipped with multiple antennas to transmit orthogonal signals. Similarly, multiple ...

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Problems solved by technology

[0004] Aiming at the decrease in the degree of freedom of the traditional coprime array DOA estimation algorithm, insufficient performance under low signal-to-noise ratio, and the existence of phase ambiguity problems, the present invention combines the expanded coprime array with MIMO radar for the first time, and proposes an expanded coprime array based on the MUSIC algorithm The Unfolded Coprime MIMO Radar DOA based on MUSIC (UCM-MUSIC) estimation method (Unfolded Coprime MIMO Radar DOA based on MUSIC, UCM-MUSIC) obtains the expan

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