Deception jamming detection method before GNSS (Global Navigation Satellite System) array receiver signal despreading
A technology of spoofing interference and detection method, which is applied in the field of satellite navigation, can solve the problems of GNSS array receiver spoofing interference detection, etc., and achieve the effect of convenient implementation, simple realization, and small amount of calculation
Active Publication Date: 2018-09-14
NAT UNIV OF DEFENSE TECH
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[0004] In order to effectively solve the problem of spoofing interference detection in GNSS array receivers, the present invention provides a method for detecting spoofing interference before signal despreading
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[0026] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0027] figure 1 It is a flow chart of the method for detecting spoofing interference of a GNSS array receiver provided by the present invention.
[0028] The first step is to estimate the array signal power, by sampling the array baseband signal r(nT s ) is obtained by multiplying and accumulating conjugate signals of different array elements and the reference array element signal.
[0029] The second step is to estimate when there is no spoofing interference with the probability distribution of
[0030] Because of the presence of spoofing interference and the absence of spoofing interference, with There are different probability distributions, so that the detection of spoofing interference can be carried out. It is usually difficult for the receiver to obtain satellite distribution and signal power before signal despreading, and its own po...
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The invention belongs to the technical field of satellite navigation, and particularly relates to a satellite navigation signal deception jamming detection method. The method mainly comprises the following steps: (S1) signal power estimation is carried out to obtain a power estimation result of array element receiving signals; (S2) the probability distribution of real and imaginary parts of a power estimation result when deception jamming does not exist is estimated; (S3) a false alarm probability is given, and a detection threshold is calculated; and (S4) the signal power estimation result and the detection threshold are compared to realize detection on deception jamming. The detection performance is good, the realization is simple, the received satellite signals do not need to be captured and tracked, the computation amount is small, the execution is convenient, and the method can be directly used for deception jamming detection on GNSS array receiver baseband sampling signals.
Description
technical field [0001] The invention belongs to the technical field of satellite navigation, and in particular relates to a method for detecting spoofing interference of satellite navigation signals. Background technique [0002] Global Navigation Satellite System (GNSS) spoofing jamming is highly concealed, which poses a serious security threat to the application of GNSS. The spoofing interference signal has the same signal structure as the real signal, and the power is relatively small. Usually, the corresponding characteristics of the signal, such as signal power, carrier Doppler, and carrier phase, need to be obtained after signal despreading for detection. Signal despreading needs to capture and track all received signals, including real signals and spoofed signals, which requires changing the receiver's capture and tracking strategy, increasing the number of signal tracking channels, and high computational complexity and hardware complexity. [0003] The spoofing inte...
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IPC IPC(8): G01S19/21
CPCG01S19/215
Inventor 李峥嵘耿正霖聂俊伟王飞雪陈飞强李柏渝张可陈雷孙鹏跃李彩华
Owner NAT UNIV OF DEFENSE TECH