A compound detection method and system for low-altitude slow-speed small targets

Abstract

The invention discloses a low-altitude low-speed small target composite detection method. The method includes arranging N detection units in a first plane under the flight area of the target according to a preset distribution strategy, each detection unit being composed of a sound sensor and a radio doppler sensor; for each of the detection units, recording the closest point time ti of the target away from the sound sensors and the closest point time t'i, i=1, 2,...N, of the target away from the radio doppler sensors; calculating the first estimated value alpha1 of the course angle of the target in the first plane based on the ti, and calculating the second estimated value alpha2 of the course angle of the target in the first plane based on the t'i; and determining the course angle alpha of the target in the first plane based on the alpha 1 and the alpha 2. The target flies at a uniform speed, and N is an integer equal to or greater than three. The method can simply and rapidly detect the low-altitude low-speed small target, the detection cost is low, and the popularization is easy. The invention further discloses a detection system, and can achieve all of the beneficial effects of the detection method.

Description

technical field [0001] The invention relates to the field of target detection, in particular to a compound detection method and system for low-altitude slow-speed small targets. Background technique [0002] Low-altitude and slow-speed small targets are a general term for various small aircraft and floating objects in the air that fly at low or ultra-low altitudes, have slower speeds, and have a smaller effective detection area. Generally speaking, flying altitudes between 100 meters and 1,000 meters are called low altitudes, and flying altitudes below 100 meters are called ultra-low altitudes. Due to the characteristics of low flying speed, low speed, and weak scattering intensity, it is very difficult to detect low-altitude, slow-moving and small targets. Usually, it is difficult for us to use a single detection method to effectively detect and monitor it all day and all day long. [0003] In recent years, although the traditional target detection methods have been perfe...

AI Technical Summary

Problems solved by technology

However, the cost of the detection system is high and it is difficult to use it in a large area

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