Research On Communication Mechanism Of Unmanned Aerial Vehicle Based On CPFSK-FH System In Ground Air Link

UAV has been widely used in both military and civilian fields,and has become the object of extensive research at home and abroad.The communication link is the main component of the UAV system,which mainly realizes the communication function between the ground station and the UAV.Ground-to-air Datalink of UAV belongs to the microwave communications process,which is easy to be affected by outside interference,however,data link communication system based on frequency hopping system has a very high anti interference,high reliability and strong imperceptibility.Therefore based on frequency hopping systems,the research for Ground-to-air Datalink and anti-jamming performance of UAV has a great theoretical and practical significance.First of all,the research of data link communication mechanism is carried out,including the research work of data link communication system components principle,data link communication system,classification of data link and the application of data link in UAV,and the method of data link network organization.On this basis,making the research for communication mechanism of Ground-to-air Datalink Based on CPFSK-FH,the mechanism focuses on Ground-to-air Datalink CPFSK modulation signal,synchronization acquisition,tracking and synchronization information demodulation and other key technologies in-depth analysis,aiming at the shortcoming of the high probability of collision probability of the frequency hopping sequence generated by RS(63,2)encoding,an improved frequency hopping sequence generation method is proposed.In order to meet the demand of ground station control multi-UAV remotely,on the base of in-depth analyze the communication process of one ground station to one UAV Communication Link,carrying out the research for a single ground station and multi-UAV networking communication,and the NHZ hopping sequence construction algorithm is improved,the simulation results show that the improved algorithm sequence Hamming crosscorrelation value decreased significantly,frequency gap increases obviously.Under software environment,according to the condition of different networking modes and different users such as the number of parameters of the system,bit error rate of system is analyzed and when based on quasisynchronous network to Ground-to-air Datalink in collision free area within the access network,the system is verified that can significantly improve the ability of anti multiple access interference(MAI).At the same time,aim to the typical jamming signals which exist in the communication system of Ground-to-air Datalink,researching the anti-interference performance of Ground-to-air Datalink.Finally based on FPGA platform,completed the design of signal generation unit and synchronized unit of Ground-to-air Datalink,and verify the correct of signal generation unit and synchronized unit,under the ModelsimSE6.5b and secure CRT environment.