Unmanned aerial vehicle (UAV) GPS spoofing detection method

Abstract

The invention discloses a UAV GPS spoofing detection method, and belongs to the technical field of UAV positioning. When a UAV U needs to determine whether spoofing attack occurs in a UAV formation flight state, the UAF sends a positioning request to a ground state and other group members; after receiving the request, the other UAVs upload position information data packages with time stamps to theground station, and the present position of the UAV V can be resolved if three UAVs or more in the group make response; and when the number of responded UAVs is lower than 3, the target UAV is positioned and tracked in the area in real time by a related angle and angle change rate combined method. The UAV position information is calculated actively in real time and compared with positioning information, not proved, received from a GPS receiver, so that attack of the group member the moment that the UAV system suffers GPS spoofing attack, and safe flight of the UAV is effectively ensured.

Description

technical field [0001] The invention belongs to the technical field of unmanned aerial vehicle positioning, and in particular relates to a method for detecting unmanned aerial vehicle GPS spoofing. Background technique [0002] At present, GPS spoofing is to make the GPS receiver of the attacked target receive false GPS signals by forging or replaying GPS signals, so that the GPS receiver of the target can calculate wrong position and time information. GPS spoofing can be divided into two types: generative GPS spoofing and forwarding GPS spoofing in terms of the generation of spoofing signals: (1) forwarding GPS spoofing is to record the real GPS signal through a GPS signal simulator or transponder, plus After a certain delay, it is transmitted to the target GPS receiver, so that the attacked target can calculate the wrong position and time information; (2) the generative GPS spoofing is relatively more complicated, and the attacker usually extracts the position, time, and t...

AI Technical Summary

Problems solved by technology

[0008] (1) The method of detecting GPS spoofing based on the physical layer characteristics of GPS signals can be applied to most UAV systems, but generally it can only detect relatively simple forwarding GPS spoofing. helpless

For example, by detecting the Doppler frequency shift of satellite signals, when an attacker uses multiple GPS transmitters to transmit specific satellite GPS signals, or even dynamically changes the frequency of GPS signals during the deception process, making different false satellite signals This detection method will not be able to detect whether the UAV system is under a spoofing attack when the Doppler shift of the

[0009] (2) Use cryptography to verify whether the signal received by the GPS receiver is a spoofed signal. Most methods use symmetric cryptography. Although its computational complexity is low, key management and distribution are difficult problems. question

[0016] GPS is an integral part of the navigation system of unmanned aerial vehicles. Once the GPS sensor is attacked, the UAV cannot calculate the current flight status, resulting in the UAV system not being able to fly stably according to the original trajectory, or even colliding or crashed

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