Broadband signal arriving direction estimation method based on iteration spectral reconfiguration

Abstract

The invention discloses a broadband signal arriving direction estimation method based on iteration spectral reconfiguration. The realizing process comprises the steps of transforming array antenna receiving data into a frequency domain through windowing Fourier transform, conducting multi-sub-band frequency domain segmentation to the data in the frequency domain, initializing each covariance matrix of each sub-band, obtaining an initialized power matrix of a frequency point according to a covariance matrix of one frequency point in the sub-bands, updating the covariance matrix of a signal at the position of the frequency point according to the initialized power matrix, obtaining corresponding optimum weight of a search angle space by the adoption of the least-squares method, updating the power of each corresponding angle according to the optimum weight on each search angle to obtain the initialized power matrix of a next frequency point and conducting iteration process, and estimating the signal arriving direction through a power spectral peak of the search angle space. The broadband signal arriving direction estimation method based on the iteration spectral reconfiguration can estimate the signal arriving direction of an incidence signal source under the conditions of weak signals and short data, is high in precision, and has the advantage of decorrelation.

Description

technical field [0001] The invention belongs to the technical field of target recognition and positioning methods, and relates to a direction-of-arrival (DOA) estimation technology of a spatial broadband incident signal. The direction of arrival of broadband sources is located with high precision under the conditions of data, coherent sources and incoherent sources. Background technique [0002] Estimating the direction of arrival of signals from the receiving array antenna is the basis for target recognition and location. At present, the direction of arrival estimation technology for narrowband signals is relatively mature. With the needs of practical applications, direction of arrival estimation for wideband signals has become a research hotspot at home and abroad. The broadband signal has the characteristics of strong anti-interference ability, high resolution, large amount of target information, and weak correlation with background noise, which is conducive to target de...

AI Technical Summary

Problems solved by technology

The CSSM method and the RSS, TCT and other algorithms developed on the basis of it all need to pre-estimate the angle and pre-select the focus frequency point. The pre-estimation deviation will affect the effect of the focus. When the deviation is large, the algorithm may be completely invalid.

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