FDA-MIMO radar incremental distance-angle two-dimensional beam forming method

Abstract

The invention discloses an FDA-MIMO radar incremental distance-angle two-dimensional beam forming method, which aims to realize accurate estimation of the distance of a target in each distance gate and improve the target detection performance. The method comprises the following steps of 1) acquiring a transmitting signal of an FDA-MIMO radar transmitting array element, 2) obtaining a receiving signal of a receiving array element after frequency mixing of a radar receiving end, 3) performing matched filtering on the transmitted waveform to obtain a sampling signal, 4) calculating a receiving signal vector after matched filtering of the radar receiving end, and 5) constructing a virtual steering vector according to the received signal vector, and finally obtaining an incremental distance-angle two-dimensional beam forming directional diagram. According to the method, the MIMO technology is adopted for the FDA array, joint beam forming is carried out at a receiving end, distance and angle decoupling is achieved, an antenna directional diagram dependent on the angle and the distance at the same time is generated, and incremental distance-angle joint detection and interference suppression of a target are achieved in a distance-angle joint domain.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to a Frequency Diverse Array-Multiple-Input and Multiple-Output FDA-MIMO (Frequency Diverse Array-Multiple-Input and Multiple-Output) radar incremental range-angle two-dimensional beamforming method, which can be used for targets Distance parameter estimation and object detection. Background technique [0002] Frequency diversity array FDA (Frequency diverse array) radar introduces a frequency step much smaller than the operating carrier frequency between the transmitting elements, so that each antenna signal can obtain a time-varying phase difference at the same time point, resulting in distance-angle- Time-3D dependent emission pattern. Since the FDA's emission pattern at a fixed time presents a distance-angle coupling characteristic, that is, the controllable degree of freedom in the distance dimension is coupled with the angle information, so the two-dimen...

AI Technical Summary

Problems solved by technology

Solve the problem that the target distance cannot be accurately estimated due to the mismatch between the actual steering vector and the ideal steering vector, effectively improving the target detection performance of FDA-MIMO radar

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