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

A DOA, single-base technology, applied to direction finders using radio waves, radio wave direction/deviation determination systems, instruments, etc., can solve problems such as insufficient performance, decreased degrees of freedom, phase ambiguity, etc., to achieve degrees of freedom and DOA Effect of improved estimation accuracy and excellent DOA estimation performance

Pending Publication Date: 2020-03-27
CHONGQING UNIV OF POSTS & TELECOMM
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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 expanded coprime array by expanding the coprime array into two opposite directions, so that the array aperture is improved, and then the The unfolded coprime array is used as the transmitting array and the receiving array respectively, which fully utilizes the advantages of the unfolded coprime array and MIMO radar. The proposed algorithm obtains better DOA estimation performance, and the degree of freedom is improved, and the phase ambiguity is completely eliminated. problem, and no additional operations are required for defuzzification

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

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[0047] In order to enable those skilled in the art to better understand the purpose, technical solutions and advantages of the present invention, a complete description will be given below in conjunction with specific implementation steps and accompanying drawings.

[0048] as attached figure 1 , this figure is a schematic diagram of the geometric structure of the array antenna proposed by the present invention. The single-base expansion coprime MIMO radar includes a transmitting array and a receiving array. The transmitting array and the receiving array each include two sparse uniform linear arrays, subarray 1 and subarray 2. , the sub-arrays are arranged in the opposite direction, and the last array element of sub-array 1 coincides with the first array element of sub-array 2. Set the number of sub-array elements as M and N respectively, without loss of generality, let M<N, the interval between the elements of sub-array 1 is Nλ / 2, and the interval between elements of sub-arra...

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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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Application Information

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IPC IPC(8): G01S3/14G01S7/41
CPCG01S3/14G01S7/418
Inventor 周围王强唐俊张维潘英杰
Owner CHONGQING UNIV OF POSTS & TELECOMM
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