CN-115856947-B - Spoofing traction code generation method resisting TOA detection and power detection

Abstract

The invention relates to a method for generating a deception traction code for TOA detection and power detection, which comprises the following steps of S1, determining traction rate S2, estimating the expected traction code phase S3, calculating required S4, calculating each The traction code sequence . The invention correlates the local code with the real signal and the deception signal respectively, and the local code is followed by traction correlation peak at the moment Correlation peak actually received by receiver along with traction phase shift Is always in the shape of an ideal correlation peak, on the basis of which the code phase will be stably based on the true code phase The power of the baseband signal received by the spoofed party is constant, so the baseband signal will not have a power jump.

Inventors

• JI NING
• RAO YONGNAN
• CHEN XIAOFEI

Assignees

• 中国科学院国家授时中心

Dates

Publication Date

20260512

Application Date

20221116

Claims (1)

1. 1. A method for generating a deception traction code for TOA detection and power detection is characterized in that a special deception traction code is generated to replace a pseudo code in an original signal system, and the traction code is obtained by the following steps: S1, determining the traction rate ; S2, calculating expected traction code phase ; S3, required by calculation ; S4, calculating each Is a traction code sequence of (2) ; Specifically, the correlation result of the real PRN and the local PRN is defined as The true or false signal is correlated with the local PRN at the same time under the condition of incomplete spoofing, and the correlation result is defined as When noise is ignored, the correlation function has Since the total correlation peak received by the receiver is Desirably, it Is the ideal shape of the correlation peak, and only the traction receiver needs to shift the code phase Wherein the method comprises the steps of Is the code phase pulling rate and, Is an ideal correlation peak; From what is desired And the correlation theorem of fourier transform, the calculation formula of the traction code sequence can be deduced: 。

Description

Spoofing traction code generation method resisting TOA detection and power detection Technical Field The invention belongs to the technical field of satellite navigation interference and interference resistance, and particularly relates to a spoofing traction code generation method for resisting TOA detection and power detection. Background In the anti-spoofing field, there are many possible defenses for the receiver. The research of the cheating interference detection by the scholars at home and abroad mainly surrounds 5 aspects of satellite signal power detection, satellite signal angle of arrival detection, satellite signal arrival time detection, consistency check detection and satellite signal encryption authentication detection. The principle design of the deception traction process directly determines the success or failure of deception and the concealment of deception, and the deception means are required to be continuously upgraded in the face of increasingly upgraded defending means. Based on the defect that the traditional traction method is easy to detect by TOA detection and power detection, the special spoofing traction code generating method is provided, is another traction thought different from the traditional traction, and can bypass TOA detection and power detection of a receiver. Disclosure of Invention The present application is directed to a method for generating a spoofed traction code for resisting TOA detection and power detection, which improves the conventional spoofed traction process and enables spoofed signals to bypass the TOA detection and power detection of a receiver. In order to achieve the above purpose, the invention provides the following technical scheme that the method for generating the deception traction code for resisting TOA detection and power detection comprises the following steps: S1, determining the traction rate ; S2, calculating expected traction code phase; S3, required by calculation; S4, calculating eachIs a traction code sequence of (2); Specifically, the correlation result of the real PRN and the local PRN is defined asThe true or false signal is correlated with the local PRN at the same time under the condition of incomplete spoofing, and the correlation result is defined asWhen noise is ignored, the correlation function has Since the total correlation peak received by the receiver isDesirably, itIs the ideal shape of the correlation peak, and only the traction receiver needs to shift the code phase Wherein the method comprises the steps ofIs the code phase pulling rate and,Is an ideal correlation peak; From what is desired And the correlation theorem of fourier transform, the calculation formula of the traction code sequence can be deduced: 。 Compared with the prior art, the invention has the beneficial effects that: the invention correlates the local code with the real signal and the deception signal respectively, and the local code is followed by traction correlation peak at the moment Correlation peak actually received by receiver along with traction phase shiftIs always in the shape of an ideal correlation peak, on the basis of which the code phase will be stably based on the true code phaseSo there will be no observed abrupt changes and correlation peak distortions, bypassing TOA detection at the receiver. At the same time due to correlation peaksDifferent from the distortion correlation peak obtained by superposition of the correlation peak of the traditional traction, the method suppresses part of real navigation signal power by utilizing the special traction code, ensures the constant power of the baseband signal received by the deception party, so the baseband signal has no power mutation and can bypass the power detection of the receiver. Drawings In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only for more clearly illustrating the embodiments of the present invention or the technical solutions in the prior art, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art. Fig. 1 is a base band signal power jump demonstration result; FIG. 2 is a classification of satellite signal arrival time detection; fig. 3 is a carrier doppler jump demonstration result; FIG. 4 is a graph showing the result of conventional traction-related peak distortion; FIG. 5 is a flowchart of the spoofed traction code acquisition step of the present invention; FIG. 6 is a schematic diagram showing the pseudo code sequence morphology change of the transceiver end of the present invention; FIG. 7 is a diagram showing the variation of the autocorrelation function of the traction code according to the present invention; FIG. 8 is a schematic diagram of a spoof pull correlation peak (time 1) of the