Frequency diverse array MIMO radar target positioning method based on fuzzy function

Abstract

The invention provides a frequency diverse array MIMO radar target positioning method based on a fuzzy function. The positioning method comprises the steps of building a frequency diverse array MIMO according to a frequency control transmission array of an antenna, a phased array receiving array, the equal interval of a frequency control array transmission array element, the equal interval of a phased array receiving array element and a moving target at a far field; building a signal matrix received by a frequency diverse array MIMO receiving array according to the frequency diverse array MIMO; and then solving angle dimension and distance dimension information of a radar target by using the fuzzy function and a multi-signal classification algorithm, and thus completing the positioning ofthe radar target. According to the positioning method provided by the invention, the fuzzy matrix is used for replacing the related matrix to solve a noise sub-space and a signal sub-space via featurevalue decomposition, and then the two-dimensional search is performed at the time-frequency spectrum to acquire the angle and distance dimension information of the target; by using the target positioning method, the far field target positioning performance can be greatly improved, and the problem that the frequency diverse array MIMO cannot accurately estimate the target information under the condition of relatively low signal to noise ratio is solved.

Description

technical field [0001] The invention belongs to the technical field of frequency-controlled array radar, and in particular relates to a target positioning method for frequency-controlled array MIMO radar based on fuzzy functions. Background technique [0002] Due to its unique distance-angle dependence, frequency control array radar has a very wide range of applications in the fields of radar systems, wireless communications, radar imaging, target estimation and tracking, jamming and anti-jamming. Compared with the phased array, the uniform linear frequency-steered array can form an angle-distance dependent transmit beam, and can estimate the angle and distance dimensions of far-field targets. The traditional target estimation method MUSIC algorithm has a large error in estimating the angle and distance of moving targets in the case of low signal-to-noise ratio, and cannot effectively estimate the angle and distance of multiple targets when they are close. At present, the s...

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Problems solved by technology

[0003] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a target positioning method based on ambiguity function for frequency control array MIMO radar, which solves the problem that frequency control array MIMO cannot accurately estimate target information under the condition of low signal-to-noise ratio

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