Method for optimizing space between broad band phased array elements and measuring frequency and direction of frequency domain multiple targets

Abstract

The invention discloses a method for matrix element distance optimization and frequency domain multi target frequency and direction measurement of wideband phased arrays, for realizing the direction measurement of multiple targets having narrow band coherence and irrelevance of a wideband receiver, resolving the contradiction between the direction measurement resolution and unambiguous direction measurement of sparse array, and realizing more accurate target detection under a certain channel error. The method comprises the steps of: first using uneven array, using genetic algorism to optimizethe distance of array elements to satisfy the higher direction measurement resolution and high direction measurement accuracy of spatial unambiguous condition; based on the optimized array, realizingthe frequency domain multi target frequency and direction measurement algorism as a DOA evaluation algorism which processes frequency domain accumulation, frequency domain check and frequency measurement for the data of each array element channel and realizes frequency automatic match. The algorism adopts array optimization, frequency domain peak snapshot frequency and direction measurement jointalgorism. The invention can be applied for the multi narrow band target accurate frequency and direction measurement of wideband receivers in the airborne and satellite-borne electronic reconnaissance.

Description

technical field [0001] The invention relates to the technical field of electronic reconnaissance, in particular to a method for optimizing the spacing between elements of a broadband phased array and for multi-target frequency and direction finding in the frequency domain. The method can be used for precise frequency and direction finding of multiple narrowband targets in wideband receivers in airborne and spaceborne electronic reconnaissance. Background technique [0002] In modern warfare, electronic reconnaissance plays an extremely important role, and has become an important means of obtaining tactical intelligence in modern high-tech warfare. In order to effectively obtain target information in a complex electromagnetic environment, foreign countries are vigorously developing new phased array antenna technologies for electronic reconnaissance, such as the U.S. directional phased array antenna and conformal phased array antenna; Erkang" conformal phased array antenna; S...

AI Technical Summary

Problems solved by technology

First of all, it is necessary to ensure that there is no ambiguity in the direction finding, that is, there are no grating lobes in the direction diagram. The Rayleigh limit requires that the array element spacing cannot be greater than half a wavelength. However, if the array element spacing is too close, it will cause coupling between the array elements. In the case of the element, the antenna size is limited, which affects the direction finding resolution

In addition, the frequency coverage reaches hundreds of megabytes under broadband conditions, and the selection of the wavelength is related to the frequency, so the selection of the array element spacing often cannot take into account the requirements of direction finding resolution and unambiguous direction finding

[0006] 2) When there are coherent signals and partially correlated signals in the target, the traditional direction finding algorithms such as Capon and MUSIC are no longer effective, while methods such as smooth MUSIC have strict requirements on the consistency of the channel, and the simultaneous direction finding of multiple narrowband targets under broadband conditions There is a problem of focusing

[0007] These problems are difficult to achieve accurate detection of narrowband targets under the condition of wideband receivers in electronic reconnaissance

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