Research On GNSS Multi Spoofing Strategy Based On Software Defined Receiver

With the development of unmanned aerial vehicle(UAV)technology,the uncontrolled "black flight" of UAV has brought great security risks to the personnel and property in the airspace environment.As GNSS spoofing can effectively control the target receiver,it plays an important role in UAV management and regional protection for guided weapons.Hence,this paper focuses on the research of spoofing attack.With GPS L1 as an example,this study aims at deceiving the target receiver to preset position.The spoofing strategy is studied based on performance of the GNSS receiver.Based on the repeater spoofing system,this paper studies,this paper studies the principle and characteristics of spoofing.According to the current research,the location of the target receiver deviates from the authentic location and the preset spoofing location under spoofing attack.The reasons for the deviation of target receiver are investigated.Based on this,complete and incomplete spoofing attack is proposed innovatively.On the basis of incomplete spoofing,the received signal model under spoofing attack is analyzed and improved.Then,the process of acquisition and tracking is studied,and the factors that influence the spoofing effect are proposed.Finally,though separating and reconstructing each satellite signal,the implement of spoofing platform is realized in this paper.Aiming at the analysis of complete and incomplete spoofing attack on the target receiver,the preset spoofing signal power,signal delay,carrier phase and Doppler and the selection of spoofed satellite are studied respectively in this paper.The analysis results show that the increase of spoofing signal power can improve the stability of the tracking loop.When ?>2,the effect of carrier phase difference can be offset.The preset spoofing code delay ?sp*introduces the estimated error of the code loop and further affect the estimation of pseudorange.When ?sp*<1+d,the pseudorange estimated error is smaller than the preset value.The preset carrier phase and carrier Doppler affect the stability of carrier loop.When the preset carrier phase and carrier Doppler become closer to the authentic ones,the carrier loop is more stable.The selection of spoofed satellites determines the preset spoofing position and is one of the key factors to achieve spoofing attack.Aiming at the influence of preset spoofing code delay rate,carrier Doppler,signal power and the selection of spoofed satellite on the target receiver,GNSS multi spoofing strategy has been studied.For general target receivers,the maximum spoofing code delay rate can be endured as 5.4,/s.With 17>1,spoofing attack can be realized.Based on the minimum control power of spoofing attack,thepseudorange control error is controlled within ?sp*·10%.Based on the location principle,theoretically,the location of the target receiver can be deceived to the preset one with more than four spoofed satelliteFinally,the GNSS multi spoofing strategy,which aims at repeater spoofing system,jam and spoof(JAS)system,and lift-off-aligned(LOA)system,is simulated and validated based on the spoofing platform.The results show that spoofing attack can be effectively realized based on the multi spoofing strategy proposed in this paper.GNSS multi spoofing strategy provides a reference for the design of spoofing attack.