Range‑Angle Decoupling Beamforming Method for Frequency Diversity MIMO Radar

Abstract

The invention discloses a frequency diversity MIMO radar distance-angle decoupling beam forming method, and mainly solves problems of impossibility of forming distance-angle decoupling self-adaptive responses of an existing frequency diversity array. The realization steps are that 1, the frequency of emission signals of the frequency diversity array is designed; 2, the emission signals and receiving end echo signals of the frequency diversity array are obtained; 3, vector outputting is carried out on the receiving end echo signals to obtain snapshot vectors of the echo signals; and 4, self-adaptive beam forming is carried out on the snapshot vectors to obtain a distance-angle two-dimensional beam forming directional diagram. According to the invention, the degree of freedom of emission of the frequency diversity array is fully utilized to form a controllable degree of freedom in a dimension of distances and angles on the basis of a frequency diversity MIMO radar system, and two-dimensional beam forming of distances and angles is realized through self-adaptive beam forming technology. The frequency diversity MIMO radar distance-angle decoupling beam forming method can be used for combined detection of distances and angles, and suppress interference signals related to the distances.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to a frequency diversity MIMO radar range-angle decoupling beamforming method, which can be used to detect targets and suppress distance-related interference. Background technique [0002] Compared with the traditional phased array radar, multiple-input multiple-output MIMO radar can effectively use the transmit degree of freedom, realize transmit-receive joint processing, improve adaptive ability, and improve radar parameter estimation performance. However, the traditional multiple-input multiple-output MIMO radar only has the degree of freedom in the angle dimension, without the degree of freedom in the distance dimension, and it is difficult to achieve distance-related interference suppression. [0003] The concept of frequency diversity array was proposed by Paul Antonik et al. at the International Radar Conference in 2006. It has flexible beam steering cap...

AI Technical Summary

Problems solved by technology

However, the distance-angle two-dimensional dependence of the frequency diversity array pattern is determined by the frequency increment, and it cannot adaptively form zero points and depressions, and its ability to suppress complex environments and interference is poor. In these cases, it will cause serious target detection performance. Therefore, it is necessary to adaptively form a beam pattern that matches the environment, and enhance the adaptability of the frequency diversity array pattern in complex environments

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