Direction of Arrival Estimation Method Based on Inverse Fast Fourier Transform of Received Signals of Multi-sampled Snapshot Coprime Array

Abstract

The invention discloses a DOA (direction of arrival) estimation method based on fast inverse Fourier transform of a multi-sampling snapshot received signal of a co-prime array, and mainly solves a problem of lower resolution caused by a condition that a conventional array aperture based on a uniform linear array method is limited. The method comprises the implementation steps: constructing a co-prime array at a receiving end; receiving an incident signal through the co-prime array, and carrying out the modeling; constructing the multi-sampling snapshot received signal of the co-prime array; carrying out the zero filling of the multi-sampling snapshot received signal of the co-prime array; carrying out the fast inverse Fourier transform of multi-sampling snapshot received signal of co-primearray after zero filling, and constructing a spatial spectrum; and carrying out the DOA estimation according to the constructed spatial spectrum. The method improves the resolution of the DOA estimation of a signal under the condition that a physical array element is certain, and effectively reduces the computing complexity.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to the direction of arrival estimation of radar signals, acoustic signals and electromagnetic signals, in particular to a direction of arrival estimation based on fast Fourier inverse transform of signals received by a multi-sampling snapshot coprime array The method can be used for passive localization and target detection. Background technique [0002] Direction-of-Arrival (DOA) estimation is a basic problem in the field of array signal processing. It refers to using a sensor array to receive signals and performing statistical processing on the received signals through a series of signal processing methods, so as to obtain the The contained direction of arrival information has a wide range of applications in radar, sonar, voice, wireless communication and other fields. [0003] The resolution of the direction of arrival estimation method refers to its abilit...

AI Technical Summary

Problems solved by technology

Most current DOA estimation methods are based on a uniform linear array structure, and the improvement of its resolution performance is mainly achieved by adding more physical array elements to obtain a larger array aperture, and more physical array elements also introduce higher System hardware and software complexity

[0004] Coprime arrays, as a sparse array with a systematic structure, have received extensive attention from the academic community in recent years. Most of the existing DOA estimation methods based on coprime arrays are compared on the basis of second-order equivalent virtual signals of coprime arrays Complex calculations, including complex matrix operations such as inversion and eigenvalue decomposition, as well as the design and solution of convex optimization problems, etc. These calculation processes lead to high computational complexity. Faced with certain challenges, and the hardware implementation in the actual system is more difficult

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