Parallel linear array single snapshot two-dimensional direction finding method

Abstract

The invention belongs to the technical field of electronic countermeasure, and particularly relates to a parallel linear array single snapshot two-dimensional direction finding method. According to the technical scheme, a double-parallel linear array is divided into three sub-arrays; smoothing processing is carried out on each sub-array by utilizing a space smoothing technology to obtain three data matrixes respectively; a large matrix is constructed according to the autocorrelation and cross-correlation information of the three data matrixes; singular value decomposition is carried out on thematrix to obtain signal subspace estimation after dimension reduction; a rotation invariant subspace method (ESPRIT) is used to calculate a rotation factor in a two-dimensional direction; and finallya pairing matrix is constructed to carry out characteristic value pairing on the rotation factor so as to realize two-dimensional direction estimation. With the method provided by the invention adopted, the problem of single snapshot two-dimensional direction finding of the parallel linear array is solved.

Description

technical field [0001] The invention belongs to the technical field of electronic countermeasures, and in particular relates to a two-dimensional direction finding method of a parallel linear array single snapshot. Background technique [0002] In electronic warfare, mastering the azimuth information of the target radiation source can help one side gain the advantage of battlefield information, so direction finding of the target signal is an important research direction. [0003] Parallel line array is a common array structure in direction finding system. It is composed of two parallel uniform line arrays in space. By using the autocorrelation information of the line array and the cross-correlation information between the two parallel line arrays Obtaining the direction information of the incident signal has the advantages of a relatively simple structure and strong applicability to most direction finding algorithms. The most important thing is that compared with the unifor...

AI Technical Summary

Problems solved by technology

However, in some cases, such as the short duration of the signal, the jump speed is too fast, or in the military field, the signal is difficult to capture, or the system has high real-time requirements, etc., the array receiving data is difficult to be sufficient, and even the effective data volume When there is only a single snapshot, the rank of the covariance matrix of the received data is smaller than the number of sources. At this time, the subspace algorithm cannot accurately separate the signal subspace, resulting in the inability to complete the estimation of the direction of arrival of the incident signal, so it cannot be directly used How fast to take the direction finding method

At present, there are very few researches on direction finding of single-snapshot signals in public reports, and the method of direction finding based on simple uniform linear array MUSIC is generally used. Therefore, how to apply the method of direction finding of single-snapshot to more complex array structures, And it can be combined with more subspace algorithms is a direction worthy of research

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