Research On UAV Uplink Communication Technology Based On Chaotic Frequency Hopping

With the wide application of UAV in the military and civilian fields,the security of information transmission between UAV and ground stations has received more and more attention.Especially the drone uplink,which mainly transmits allegation information of ground stations,requires high real-time and high security,which is a very important link in drone communication.Compared with the direct sequence spread spectrum data link,the frequency hopping data link is more resistant to interference and interception.A good frequency hopping sequence makes the drone frequency points evenly distributed in the frequency band,which can ensure the safety of the drone communication link,achieve the purpose of not being easily intercepted,and enhance the security and anti-interference of the drone data link.At the same time,it also has better spectrum utilization efficiency.Therefore,it is of great theoretical and practical significance to conduct research on UAS uplink communication technology based on chaotic frequency hopping.This article first studies the composition of UAV data link,commonly used UAV data link,DSSS signal modulation technology.Focusing on the shortcomings of the existing m-sequences,Gold sequences,and the shortcomings of the number of code users,combined with the excellent characteristics of chaotic sequences,a method for constructing cascade variable-parameter chaotic frequency hopping sequences was proposed.Variable parameter chaotic frequency hopping sequences have excellent performance.The mechanism of the uplink data link information transceiver of the UAV is further studied,including the baseband information modulation mechanism,the synchronization tracking acquisition mechanism,and the Rice channel model.In the MATLAB simulation environment,the signal generation,reception,and channel interference of the UAS uplink communication system based on chaotic frequency hopping were simulated,and the correctness and reliability of the system's transmission and reception were verified.Finally,the anti-interference performance of the system under different interference conditions is simulated,and the error rate curve of the system is analyzed.