Research On Low Altitude Small Target Detection Algorithm Based On Mobile Communication System

The existence of low-altitude equipment such as unmanned aerial vehicles makes lowaltitude airspace management planning of great significance,but low-altitude environments have complex environments,low-altitude targets have a "low-slow-small" feature,and existing detection techniques are complex,resulting the detection and location of lowaltitude small targets are more difficult than in high-altitude environments.This article aims to use the mobile communication system to detect and locate low-altitude small targets.Because the mobile communication system uses the single-receiving channel mode of signal reception,the continuity of the mobile communication signal increases the difficulty of the fusion of the communication system and the detection system.Therefore,this paper focuses on how to combine mobile communication as a low-altitude small target detection system on the above issues,and to detect and locate low-altitude small targets.Since the direct wave and other interference signals will affect the detection of low-altitude small targets,the suppression and elimination of interference signals such as direct waves has great significance for the detection of low-altitude small targets.Receiving signals in the single-reception channel mode of mobile communication will cause the direct wave reference signal in the reference receiving channel in the traditional interference cancellation algorithm to be unable to be extracted.Therefore,this paper proposes an algorithm for reconstruction and suppression of interfering signals under a single receive channel.First,the mobile communication system is used to perceive the signal transmission environment in the detection area,and the direct wave signal is reconstructed according to the result of the perceived environment and the known local sequence,and the reconstructed direct wave signal is used as the reference signal of the interference suppression algorithm,it also suppresses and eliminates interference signals such as direct waves in the receiving channel.Finally,the simulation verifies the effectiveness and practicability of the algorithm.Compared with the existing algorithm,it can effectively combine the mobile communication single receiving channel mode and complete the suppression and elimination of interference signals.The weakness of low-level small target echo signals and the complexity of the propagation environment are another difficulty in low-level detection.For the weak performance of lowaltitude small target echo signals,according to the frame structure characteristics of mobile communication signals and the structure of the OFDM symbol,the signal energy of the lowaltitude small target echo signal is accumulated.The detection system obtains the signal structure by combining the direct wave signal and accumulates the signal according to the mobile communication signal structure,and uses the high information transmission rate of the mobile communication signal to effectively accumulate the low-altitude small target echo signal.In addition,considering the complexity of the low-altitude environment where the low-altitude small target echo signal is located,the detection system calculates the decision threshold of the current detection unit based on the environmental information provided by the local signals around the current detection unit,therefore,it can effectively deal with the influence of clutter and noise and other signals in the detection process of lowaltitude small targets.Finally,the simulation results verify that the detection system can effectively and accurately extract and detect the low-altitude small target echo signal.Finally,the system performance of the low-altitude small target detection system under mobile communication is analyzed.The simulation results show the positioning error of the detection system under different distribution modes of the detection node to the low-altitude small target,and the location effect map of the low-altitude small target is displayed.The low-altitude small target detection system under mobile communication is validated for the low-altitude small target detection and positioning.