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A Clean-Based Sparse Array Direction of Arrival Doa Estimation Method

A sparse array, direction of arrival technology, used in radio wave measurement systems, instruments, etc.

Active Publication Date: 2017-02-01
CNGC INST NO 206 OF CHINA ARMS IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to avoid the deficiencies of the prior art, the present invention proposes a sparse array DOA estimation method based on CLEAN, which solves the problem of strong targets corresponding to false targets generated by the interaction of high side lobes of the sparse array when strong and weak targets coexist. Problems with Responses Larger than Weak Target Responses

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  • A Clean-Based Sparse Array Direction of Arrival Doa Estimation Method

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Embodiment Construction

[0039] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0040] In the content of the present invention, a one-dimensional array is taken as an example for description.

[0041] For a one-dimensional linear array antenna composed of N array elements, a sparse array can be obtained by randomly removing some array elements. For the convenience of description, a one-dimensional array A containing N elements is used rr Represents a sparse array, where the elements corresponding to the removed array elements are 0, and the elements corresponding to the retained array elements are 1. Assume that the array element spacing is d, there are p incident targets, and the directions are θ i (i=1,...p), the noise received by each array element is Gaussian white noise with zero mean value. Then the received signal can be expressed as:

[0042] X=(AS+N)·A rr (1) In the formula, X is the sampling data, S is the target vector, N is...

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Abstract

The invention relates to a sparse array DOA estimation method based on CLEAN. The sparse array DOA estimation method based on CLEAN comprises the following steps that the number of targets is calculated according to the MDL rule; an amplitude square accumulation result of wave beams formed by all snapshot data is calculated; the calculation result is searched for the number of the wave beam corresponding to the maximum value; an accurate number of the wave beam is calculated through an equisignal angle measurement method; a target angle is calculated; whether all signals are detected or not is judged; detected target responses are removed through the CLEAN concept, and then iteration is conducted. By the adoption of the sparse array DOA estimation method based on CLEAN, the influence of action of a strong target and a high sidelobe on weak target angle estimation is well restrained, and a high angular accuracy is achieved; in addition, the consumed time is short, and time consumption is not sensitive to the number of array elements.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and in particular relates to a CLEAN-based sparse array DOA estimation method. Background technique [0002] Array antennas are used extensively in radar and communication systems. Evenly spaced antennas are by far one of the simplest and most widely used array antennas. However, evenly spaced antenna arrays may have grating lobes. In order to avoid the occurrence of grating lobes, it is usually required that the spacing of the antenna arrays is not greater than half of the wavelength. Therefore, if a higher angle resolution is desired, a lot of array elements are required, which will not only increase the cost of the antenna, but also increase the burden on the digital signal processing system due to the large amount of data generated. [0003] Sparse processing is performed on uniformly distributed arrays, that is, some array elements are randomly removed from the uniform arra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/41
CPCG01S7/2813G01S7/41
Inventor 杨刚袁子乔付学斌王亚军赵博
Owner CNGC INST NO 206 OF CHINA ARMS IND GRP