Layout and method for improving angular resolutions of radars based on MIMO mechanism

Abstract

The invention discloses a layout and method for improving angular resolutions of radars based on the MIMO mechanism, in which the resolution of a radar system for a target is remarkably improved through antenna layouts of distributed and compact MIMO radars and the imaging algorithm. Two different compact MIMO radars with 3-transmit 4-receive antenna layouts are firstly independently designed, andeach radar has a corresponding angular resolution; the two compact MIMO radars are then spaced by a certain distance to form distributed MIMO radars; a two-way delay of each pixel point in a certainspace area relative to the positions of antennas is calculated through a fast algorithm, and an echo index is determined based on the corresponding delay, so that an imaging diagram of a correspondingecho in the set space area is obtained; and the two radars respectively carry out imaging, and an intersection point is a target position. The layout and method disclosed by the invention has the advantages that a new fast imaging algorithm application field is provided, and the purpose of improving the angular resolution of the target position is achieved.

Description

technical field [0001] The invention discloses a layout and a method for improving radar angle resolution based on MIMO system, and relates to the technical field of traffic radar antennas. Background technique [0002] For the design requirements of radar, the resolution of various indicators has always been one of the important goals pursued by radar development, so the derived technologies are also diverse. Radar resolution refers to the minimum actual distance at which the echoes generated by two targets on the radar fluorescent screen can be distinguished, that is, the minimum actual distance between two targets that the radar can distinguish on the screen, and the angular resolution is It refers to the minimum angular difference between two targets that can be distinguished in angular orientation. If there are two equidistant targets (or target and interference) in the same beam, only one compound target can be detected by conventional radar processing, and it is ofte...

AI Technical Summary

Problems solved by technology

If there are two equidistant targets (or target and interference) in the same beam, only one compound target can be detected by conventional radar processing, and it is often difficult for the radar to distinguish each target, so it is necessary to improve the radar azimuth angle resolution

[0003] Traditional MIMO radar signal processing uses various algorithmic techniques to improve the resolution through the echoes inside the compact MIMO radar, such as digital beamforming (DBF) and direction of arrival (DOA) technology, etc., but its improved resolution To a limited extent, it is difficult to achieve high resolution

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