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

Abstract

The invention discloses a combined detection method for detecting the flight speed of a low-altitude, slow-speed and small target. The method includes the following steps that: N detection units are arranged at a first plane under the flight region of the target according to a preset distribution strategy, wherein each detection unit is composed of a sound sensor and a radio Doppler sensor; as for each detection unit, a time point ti when the target is closest to the sound sensor and a time point t'i when the target is closest to the radio Doppler sensor are recorded, wherein i is equal to 1,2, ...N; the first estimated value v1 of the flight speed of the target is calculated according to ti, and the second estimated value v2 of the flight speed of the target is calculated according to t'i; and the flight speed v of the target is determined according to v1 and v2. According to the method, the target flies at a uniform speed, and the flight trajectory of the target is parallel to the first plane; and N is an integer equal to or greater than 3. With the method adopted, the flight speed of the low-altitude, slow-speed and small target can be detected easily and quickly. The detection method has the advantages of low detection cost and easiness in popularization. The invention also discloses a detection system which can realize all the advantages 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 target flight speed. 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 hav...

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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