Underdetermined DOA estimation method based on target space diversity

A space diversity, target technology, applied in the field of underdetermined DOA estimation based on target space diversity, can solve the problems of unfavorable popularization and application, the requirements of incident signal characteristics are often too high, and the number of signal sources is limited. The effect of flexible and optional accuracy and estimation method

Active Publication Date: 2020-08-11
NANJING UNIV OF SCI & TECH
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Problems solved by technology

Although these methods can solve the problem of underdetermined DOA estimation, the number of sources that can be estimated is still relatively limited, especially in the case of a small numb

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  • Underdetermined DOA estimation method based on target space diversity
  • Underdetermined DOA estimation method based on target space diversity
  • Underdetermined DOA estimation method based on target space diversity

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[0050] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.

[0051] The present invention considers using the common LFMCW system radar in engineering application to solve the underdetermined DOA estimation problem. The radar of the LFMCW system is relatively mature at present, and the conventional subspace-type DOA estimation algorithm is also relatively mature. Combining two mature and simple methods to solve a difficult problem is simple and ingenious, and it can be combined with engineering practice. It is conducive to engineering realization, and can realize the joint estimation of the target's angle-distance-speed, which is co...

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Abstract

The invention discloses an underdetermined DOA estimation method based on target space diversity, and aims at LFMCW system radar. The method comprises the following steps: carrying out two-dimensionalFFT on each path of array antenna receiving signal by utilizing the characteristics of an LFMCW system radar; selecting one path of signal to carry out two-dimensional constant false alarm rate CFARdetection so as to acquire distance and speed information of the target; wherein each path of signal is divided into target subspaces according to the distribution of a target in a distance-speed space; and finally, performing DOA estimation on each target subspace. By means of the characteristics of the LFMCW radar, diversity is conducted on incident target signals in the distance-speed space, more target DOAs can be estimated when the number of array elements is fixed, the overall performance of the array is improved, and distance-speed-angle joint positioning of targets can be achieved. Themethod is high in angle measurement precision, good in anti-noise performance, suitable for various array structures, simple, easy to operate and convenient for engineering practical application.

Description

technical field [0001] The invention relates to the field of array signal processing, in particular to the field of angle of arrival estimation of LFMCW array radar, in particular to an underdetermined DOA estimation method based on target space diversity. Background technique [0002] Array angle of arrival (DOA: Direction-of-arrival) has been a hot and difficult research point since it was proposed in the 1970s. It is widely used in array signal processing fields such as radar, sonar, wireless communication, and seismic sensing. The multiple signal classification algorithm (MUSIC: Multiple Signal Classification) proposed by Schmidt has greatly promoted the development of subspace-like DOA estimation algorithms. Although conventional subspace super-resolution DOA estimation techniques can break the constraints of the Rayleigh limit, most algorithms require that the number of sources is smaller than the number of antenna elements, and the number of targets that can be estima...

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Application Information

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IPC IPC(8): G01S3/72G01S3/48G01S13/58
CPCG01S3/72G01S3/48G01S13/584G01S13/588
Inventor 吴文唐辉缪晨齐世山陈春红汪敏康炜杨国王晶琦
Owner NANJING UNIV OF SCI & TECH
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