GPS Spoofing Detection Based On RSSI

Since the advent of R & D in the last century,the GPS system has been widely used in various fields of society by virtue of its ultra-high coverage,accurate positioning,and allweather work.It has solved the previous problems in sea transportation,mining,surveying and mapping,etc.Positioning problems.At the same time,in the military field,the important and critical role of GPS is self-evident.For example,the precise strike of various guided missiles and cruise missiles.The precise strike of these military weapons cannot be separated from the powerful GPS positioning system.However,at the same time,the widespread use of GPS has also triggered a series of black industries.Many criminals continue to abuse GPS technology,resulting in many GPS spoofing events,which have brought many negative effects and economic losses to the stable operation of society..Therefore,protecting the GPS positioning system from abuse by criminals is an important guarantee for maintaining social stability.This article first introduced the GPS system briefly,followed by a brief analysis of the GPS working method,and discussed the vulnerability of the GPS signal.Then this paper analyzes and discusses the deception principles of the existing forwarding GPS deception,generative GPS deception,and the two deception methods,and studies the existing deception defense work,and analyzes the theoretical details and specific technologies of each defense scheme.Due to the limitations of the application of existing defense schemes and the problems of low accuracy,on the basis of summarizing previous work,this paper proposes a GPS deception positioning detection method based on RSSI,which is divided into GPS deception detection and GPS deception There are two stages of positioning,that is,this method can not only determine whether the aircraft is deceived,but also further locate key GPS deception points.In the GPS spoofing detection stage,we obtain an RSSI information sequence of an aircraft based on the GPS information of the aircraft itself,and at the same time calculate an RSSI-infer sequence based on the flight trajectory of the aircraft and the transmission attenuation characteristics of RSSI with distance.The similarity is high.Therefore,when acquiring the above two sequences,we perform noise reduction processing such as filtering and linear fitting on the two sequences.By performing DTW(Dynamic Time Warping)calculation analysis on the similarity of the two sequences,we can judge Whether the aircraft was deceived by GPS.Further,in the GPS spoofing and positioning stage,when we determine that the current aircraft is spoofed by GPS,a GPS spoofing positioning method based on change point detection is proposed.This method obtains the Euclidean distance of the sliding window from the above two sequences,uses the variable point detection method to extract the key points of GPS spoofing,and then uses k-means clustering to locate the key nodes where GPS spoofing occurs,providing technology for combating GPS spoofing stand by.The methods in this article include but are not limited to the following highlights:1.Compared with the existing method,the new method requires no hardware upgrade and has a wide range of applications;2.The new method is based on key RSSI data for fraud detection and location.The variables are not complicated and easy to popularize and implement;3.The new method introduces DTW algorithm and other technologies in the direction of speech recognition.Compared with the existing methods,the new method has fewer limitations,higher accuracy and more stability;4.The new method further proposes a spoofing positioning algorithm,that is,when determining that the current aircraft has been spoofed,using change point detection can locate the start and end of GPS spoofing.