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Signal two-dimensional DOA and frequency joint estimation method applied to L-type array

A technology of joint estimation and DOA, applied in frequency measurement devices, direction finders using radio waves, radio wave direction/deviation determination systems, etc., can solve high complexity problems, achieve small calculation, low capacity requirements, and easy Achieved effect

Pending Publication Date: 2019-01-04
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

This process is generally complex, especially when the signal receiving array is large or the number of signal samples is large

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  • Signal two-dimensional DOA and frequency joint estimation method applied to L-type array
  • Signal two-dimensional DOA and frequency joint estimation method applied to L-type array
  • Signal two-dimensional DOA and frequency joint estimation method applied to L-type array

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Embodiment Construction

[0044] The invention proposes a method for jointly estimating two-dimensional DOA and frequency for non-coherent signals received by an L-shaped array. In this method, in order to estimate the frequency of the received signal, the signal is received with multi-level time delay, and the multi-level time-delay output signal is constructed as a parallel factor trilinear model. In order to reduce the complexity of decomposing the model, the algorithm combines the theory of compressed sensing to compress the model in blocks, and then uses the trilinear alternating least squares algorithm to decompose the model to obtain the estimation of the signal parameter matrix, and The two-dimensional DOA and frequency estimation of the signal are obtained from the obtained parameter matrix. The algorithm can be applied to uniform L-matrix and non-uniform L-matrix at the same time, and during the decomposition process, the parameter matrix has the same column ambiguity, so the angle and freque...

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Abstract

The invention discloses a signal two-dimensional DOA and frequency joint estimation method applied to an L-type array. The method comprises the following steps of (1) constructing a signal received bythe L-type array to a parallel factor trilinear model; (2) carrying out elementary row transformation on the model and carrying out block compression according to a compressed sensing theory; (3) using a trilinear alternating least square algorithm to carry out cyclic iterative decomposition on the compressed model until convergence so as to obtain the estimation of a parameter matrix; and (4) constructing the complete dictionary of frequency and angle estimations, and successively using a sparse recovery method to obtain the frequency and two-dimensional DOA estimations of a signal. The method has advantages that (1) the method is suitable for a uniform L array and a non-uniform L array, and the array is easy to realize during an actual application; (2) the calculated amount of an algorithm in the invention is small and simultaneously a capacity requirement to data storage is low; and (3) in the algorithm of the invention, by means of the parallel factor model, paired angle and frequency estimations can be acquired, and extra pairing does not need to be performed.

Description

technical field [0001] The invention relates to the technical field of array signal processing multi-parameter joint estimation, in particular to a signal two-dimensional DOA and frequency joint estimation method applied to an L-shaped array. Background technique [0002] In recent years, array signal processing has developed rapidly in many fields such as radar, sonar, and wireless communication. As an important research direction in array signal processing, multi-parameter joint estimation of received signals has also been widely recognized by relevant scholars. focus on. Array received signals usually contain information such as DOA and Doppler frequency. How to accurately obtain the joint estimation of these parameters from received signals has become a hot spot in the research of array signal processing algorithms. [0003] In recent years, scholars at home and abroad have proposed many algorithms for joint estimation of received signal DOA and frequency. These includ...

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Application Information

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IPC IPC(8): G01S3/14G01R23/02
CPCG01R23/02G01S3/14
Inventor 徐乐张小飞施展时娜
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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