Research On GPS Spoofing Jamming Technology For Civil UAV

With the opening of low-altitude airspace in various countries and the informationization and intelligent development of civilian drones,the use of civilian drones has become more widespread,which has caused difficulties in the supervision of drones.In view of the various hazards caused by the "black fly" of the drone,while improving the airworthiness laws and regulations of the drone,the anti-UAV technology should also be studied.The application scenario of anti-UAV destruction technology is very limited,and the suppression technology is not suitable for all weather opening,and due to the vulnerability of the GPS system itself,this paper mainly studies the GPS spoofing jamming technology of civil UAVs.The main research content is signal parameter synchronization.and spoofing intrusion.Firstly,the deception system model is established according to the intermediate deception scenario.The deception system model divides the deception process into: signal parameter synchronization and spoofing intrusion.Aiming at the problem of signal parameter synchronization,the schemes of power estimation,code phase delay compensation and carrier Doppler compensation are proposed respectively.The feasibility of navigation message prediction and the difficulty of implementing carrier phase estimation are analyzed.The influence of the spoofing signal on the tracking loop of the target receiver is studied theoretically when the code phase and carrier frequency synchronization error exist in the spoofing system,and the simulation is verified.And the effects of different power spoofing signals on the capture loop are analyzed.Secondly,in view of the assumption that the spoofing signal is substantially aligned with the real signal,a scheme for synchronously pulling the code phase is proposed.That is,on the basis of the basic alignment of the code phase,the spoofing signal is gradually advanced beyond the code phase of the real GPS signal,and finally the target receiver tracking loop is stably controlled by increasing the pseudo code rate.And in the traction process,it is necessary to maintain the relative advantage of deceiving power.Then,because the synchronous traction scheme has higher requirements on the synchronization technology,a more widely used asynchronous traction scheme is proposed,which generates a higher power deception delay correlation peak,then increases the pseudo code rate,and gradually aligns until the real signal is advanced.Finally,stable control of the tracking loop is reached.According to the principle of the identification phase of the code loop,the theoretical feasibility of the scheme is analyzed,and the asynchronous traction scheme is simulated and verified.At the same time,it is verified that the asynchronous traction scheme can complete the traction of the carrier phase.Finally,a generated navigation signal source is built by the combination of software and hardware.The signal source can simulate the transmission of multichannel GPS signals and can control the transmit power of the signal and the number of visible stars.For the primary spoofing scenario,the actual measurement of singlepoint location spoofing and dynamic path traction is completed.