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...

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