A pitching wide-beam radar ground and a low-altitude object classification method

Abstract

The invention discloses a pitching wide-beam radar ground and a low-altitude object classification method, which belongs to the technical field of radar detection. The method comprises the following steps of: designing a single baseline angle-measuring antenna system; assuming that the operating frequency of a system is f[c] and the operating wavelength lambda=f[c], wherein c represents the propagation speed of electromagnetic waves, the maximum pitch angle of a low-altitude object in a detection range is theta[Max], the pitch angle of the a ground object is 0 and a antenna base line length d<lambda / Sintheta[Max]; carrying out the same signal processing on a baseline receiving channel U and a baseline receiving channel D; and measuring an interference angle theta<'>[k] of the object by an interference method; and measuring an interference angle phi<'>[k] of ground clutters at the same distance from the object. When theta<'>[k]=phi<'>[k], the object belongs to the ground object, and theta<'>[k] is not equal to phi<'>[k], the object belongs to the low altitude object. The system of the invention is low in complexity degree, low in cost, simple in calculating, free from influences by object attitudes, good in stability and can simply and rapidly reject mass objects on the ground to reduce interferences to low-altitude low-speed object detection.

Description

technical field [0001] The invention belongs to the technical field of radar detection, and relates to a method for classifying ground and low-altitude targets for pitching wide-beam radars, in particular to a method for distinguishing ground targets and low-altitude targets for pitching wide-beam radars under the background of urban clutter. Background technique [0002] With the gradual opening of my country's low-altitude airspace and the rapid development of civilian drones, the detection of low-slow and small targets over cities and key areas is an urgent problem to be solved. [0003] At present, the combination of photoelectric radar is generally used to detect low, slow and small targets. Compared with photoelectric detection methods, radar has many advantages such as all-weather and all-time, long detection distance, high clutter visibility, and high search and tracking efficiency. However, there are a large number of cars and pedestrians in the city, these targets ...

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Problems solved by technology

[0010] In order to achieve the above object, the present invention provides a low-cost, fast and effective pitching wide beam radar ground and low-altitude target classification method, which solves the problem that the traditional target recognition method based on micro-motion information is sensitive to target posture and has a large amount of calculation. The current target screening method is incomplete for target screening and is easy to miss detection of flight targets in the road-following network. The high-resolution angle measurement method is complex in system and high in cost. By comparing the difference between the incoming wave direction of the target and the incoming wave direction of ground clutter Eliminate a large number of ground targets to avoid interference with the detection of low-altitude, slow and small targets

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