Obstacle avoidance radar method and device based on ultra-wideband cognitive CPPM signal

Abstract

According to the invention, an obstacle avoidance radar based on an ultra-wideband cognitive CPPM signal generates a number of wide band CPPM signals which are orthogonal to each other. The signals pass through a transmitting beamforming module to form radar transmitting signals, and the signals are transmitted by a rectangular electron scanning array antenna of a receiving/ transmitting switch module. If another flight target carries out reflection, an echo signal is received by an electronic scanning array antenna to form a received signal, and the signal is collected by a signal acquisition module. A receiver matches a filter module to acquire the distance-doppler information of the target. The echo amplitude, the azimuth and the height information of the target are acquired through a two-dimensional multiple signal classification module. The information enters a Dirichlet process hybrid model clustering module for gather classification, and then different targets are distinguished through a generalized likelihood ratio detection module. The individual target information is sent into a variable point detection module to detect a mutational point in a target movement trajectory. According to the mutational point, the amplitude and the pulse width of the CPPM signals are redesigned, and the movement trajectory of an unmanned aerial vehicle is corrected to avoid collision with other flight targets.

Description

technical field [0001] The present invention relates to UAV obstacle avoidance radar, specifically an obstacle avoidance radar based on ultra-wideband cognitive chaotic pulse position modulation (CPPM) signal, which is used to help UAV detect and distinguish other aircraft Or obstacles, estimate the sudden change point in the flight trajectory of the drone, and avoid collisions. Background technique [0002] Unmanned aerial vehicle (UAV) refers to an aviation vehicle that is driven by power, unmanned on board, can carry multiple mission equipment, perform multiple tasks and can be reused. It is an unmanned aircraft operated by radio remote control equipment or its own program control device aircraft. UAVs have the characteristics of light weight, small size, high maneuverability, good concealment, strong adaptability, and no need to risk their lives. They have received extensive attention in military and civilian fields. For military use, UAVs are used for reconnaissance a...

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Problems solved by technology

However, the ultrasonic detection beam angle is too large, coupled with the influence of ambient temperature and humi

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