Abstract
As a structural interference, spoofing is difficult to detect by the target receiver while the advent of a repeater makes the implementation of spoofing much easier. Most existing anti-spoofing methods are merely capable of detecting the spoofing, i.e., they cannot effectively remove counterfeit signals. Therefore, based on the similarities between multipath and spoofing, the feasibility of applying multipath mitigation methods to anti-spoofing is first analyzed in this paper. We then propose a novel algorithm based on maximum likelihood (ML) estimation to resolve this problem. The tracking channels with multi-correlators are constructed and a set of corresponding steps of detecting and removing the counterfeit signals is designed to ensure that the receiver locks the authentic signals in the presence of spoofing. Finally, the spoofing is successfully executed with a software receiver and the saved intermediate frequency (IF) signals, on this basis, the effectiveness of the proposed algorithm is verified by experiments.
Highlights
GPS is susceptible to a variety of interferences due to the low signal power
On the other hand, spoofing is a structural interference, the counterfeit signals rebroadcasted by spoofers are very similar to the authentic signals from satellites and can gradually induce the positioning results of the target receiver to a false location [1,2,3,4]
GPS tracked signals with samplingreceiver, rate of 38.192MHz is read. These loaded signals amplified by 1.2and times such that output isreceiver, denoted as the counterfeit signal
Summary
GPS is susceptible to a variety of interferences due to the low signal power. For GPS receivers, there are two major types of interferences at present: jamming and spoofing. On the whole, most of the current anti-spoofing techniques are merely able to detect the spoofing This means that the target receiver can ensure that the positioning results are not affected by closing the corresponding channels after detecting the spoofing only when the number of the authentic signals spoofed with the counterfeit signals is small. If the carrier frequency of the counterfeit signal is consistent with that of its corresponding authentic signal, the correlation peak of the composite signal of spoofing will be similar to that of multipath, which is the most difficult situation to detect and handle. The distance between the correlation peaks of these two kinds of signals may be either far or close It means that not all multipath mitigation methods can be generalized to anti-spoofing.
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