Research Of Spoofing Detection Methods Based On BeiDou Navigation Satellite System Signal

With the further development of science and technology,internet of things,artificial intelligence and so on are gradually rising nowadays.Therefore,the application of satellite navigation and positioning is more in-depth in people's daily life.However,the production and construction costs of spoofing sources are also gradually reduced,which further increases the potential damage for people.Based on such background and the existed research achievements,the corresponding compound spoofing detection algorithm is proposed.In addition,the practicability of the spoofing detection algorithm is verified through an engineering experiment system.The proposed spoofing detection algorithm next is composed of several detection methods.The first one is the energy detection based on the signal power threshold and the CNR(Carrier Noise Ratio).The second is the FWHM(Full Width of Half Maximum)detection obtained by fitting the correlation peak with Gaussian curve.The last one is the CPFE(Correlation Peak Fitting Error)detection,through calculating the fitting curve and the ideal state correlation peak error.When the receiver obtains an unknown navigation signal,it will first test the number of correlation peak.If there are two correlation peaks,it means that there must be spoofing.Otherwise,we must test it with the energy detection method,then the FWHM detection and the CPFE detection method.Only all three methods tell its truth,the conclusion can be decided,while it must be spoofing.In this paper,not only the theoretical analysis and simulation,but also the actual experiment is carried out on the compound detection algorithm.The experiment system is introduced in details,including the design of the scheme,the parameters of the equipment and the test procedures.What's more,a number of indicators are proposed to analyze and verify the effect of the experiment,such as CNR,detection probability and CPFE.It can be found that the compound spoofing detection algorithm can be applied to a variety of spoofing cases.Through the protection of this algorithm,error detection will not happen.This is another difference between the proposed algorithm and existed algorithms now.That is,the algorithm has been verified by the engineering experiment,which proves the engineering practicability of the algorithm.