Detection method of location spoofing attack in FM signal indoor positioning system

Abstract

The invention discloses a detection method for a position deception attack of an indoor positioning system based on a frequency modulation signal, which mainly solves the problem in the prior art that the position deception attack cannot be detected in an indoor positioning system based on a frequency modulation signal. The method steps are initializing, determining a threshold, receiving undetected signals, calculating frequency domain correlation, and detecting location deception attacks. The invention fully combines the frequency domain characteristics of normal frequency modulation signals, carrier signals and natural noise signals, and converts time domain signals into frequency domain for processing, avoiding the characteristics of irregular amplitude changes of time domain signals in location deception attacks; using frequency spectrum The cross-correlation represents the signal characteristics, which ensures the efficient judgment of the attacked signal; the upper and lower thresholds are used for double judgment, which improves the detection accuracy.

Description

technical field [0001] The invention relates to the technical field of communication, and further relates to the indoor positioning technology of frequency modulation signals. According to the characteristics of normal frequency modulation signal, carrier signal and natural noise signal, the present invention can perform two-level detection on undetected signals by combining the cross-correlation of signal frequency domain and adopting the method of upper and lower thresholds, and further judge the true signal type of undetected signals, Therefore, a judgment can be made on whether the positioning system is attacked, making the method more efficient and flexible in detecting location spoofing attacks. Background technique [0002] In recent years, because GPS signals cannot be transmitted indoors, underground and in tunnels, and are easily blocked by large trees, mountains, and tall buildings in cities, and have multipath effects, it is difficult to apply them to indoor envi...

AI Technical Summary

Problems solved by technology

[0003] A location spoofing attack refers to an attacker tampering with the location information of a normal user's location, so that the normal user obtains the location information tampered with by the attacker when the normal user needs to obtain the location information, resulting in an error in obtaining the location information

The position spoofing attack of the FM signal indoor positioning system is based on the signal strength of the target position and the false position, combined with the characteristics of the FM signal frequency changing within a certain range of the center frequency, and constructs an attack signal that is the same as the carrier frequency of the FM signal but opposite, so that the attack signal and The normal FM signal is fused in the transmission medium to achieve a change in the strength of the normal FM signal, resulting in an error in the position determination of the positioning system

Images