Coprime MIMO radar arrival direction estimation method based on multi-sample snapshots and set array signal discrete Fourier transform

Abstract

The invention discloses a coprime MIMO radar arrival direction estimation method based on multi-sample snapshots and set array signal discrete Fourier transform. The method mainly solves the problem that the calculation complexity of an existing method is high. The method comprises the steps that a homogeneous MIMO radar structure is established; reflected signals are received through a radar receiving sub-array, and modeling is carried out on radar output signals; the coprimey MIMO radar multi-sample snapshots and set array receiving signals are constructed; zero padding is carried out on themulti-sample snapshots and the set array receiving signals; the multi-sample snapshots and the set array receiving signals obtained after zero padding are subjected to sidelobe suppression; the multi-sample snapshots and the set array receiving signals obtained after filtering are subjected to discrete Fourier transform to construct a spatial spectrum; arrival direction estimation is conducted according to the obtained spatial spectrum. A larger array aperture is obtained under the condition that the number of physical array elements is certain, and the calculation complexity of arrival direction estimation is reduced.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to statistical signal processing of radar signals, acoustic signals and electromagnetic signals, in particular to a mutual prime MIMO radar direction of arrival based on multi-sampling snapshots and discrete Fourier transform of array signals Estimation method that can be used for active localization and object detection. Background technique [0002] As one of the basic problems in the field of array signal processing, direction-of-arrival (DOA) estimation uses sensor arrays to receive signals, and through statistical processing of the received signals, the direction-of-arrival information contained in the signals is extracted from them. , It is widely used in radar, sonar, voice, wireless communication and other fields. Among them, DOA estimation using Multiple-input Multiple-output (MIMO) radar is an important branch. [0003] MIMO radar utilizes multiple ...

AI Technical Summary

Problems solved by technology

[0004] Most of the existing DOA estimation methods based on coprime MIMO radar perform a series of complex operations on the second-order equivalent virtual signal corresponding to the constructed virtual array, mainly including complex matrix operations such as inversion and eigenvalue decomposition, and convex optimization problems The complex process of design and solution, the hardware implementation in the actual system is relatively complex, and it faces certain challenges in application scenarios with high real-time requirements

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