A method of spoofing signal parameter estimation for gnss signal receiver

A technology of signal parameters and receivers, which is applied in satellite radio beacon positioning systems, instruments, measuring devices, etc., can solve the problem of few parameters of spoofing signals, and achieve the goal of improving anti-spoofing ability, improving utilization rate, and strong anti-spoofing ability Effect

Active Publication Date: 2022-07-08
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0005] At present, the existing narrow-range multi-correlator utilization and anti-spoofing technology, in the GNSS pseudo-random code phase tracking loop, there are relatively few related researches on real-time estimation of the spoofing signal parameters received by the GNSS receiver

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  • A method of spoofing signal parameter estimation for gnss signal receiver
  • A method of spoofing signal parameter estimation for gnss signal receiver
  • A method of spoofing signal parameter estimation for gnss signal receiver

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Embodiment Construction

[0060] The present invention will be described in detail below with reference to the accompanying drawings.

[0061] like figure 2 As shown in the figure, the fitting curve of the receiver to the signal with an interference-to-signal ratio of 6.02dB (the power of the spoofing signal is twice that of the GNSS signal) is the fitting curve of the correlation result. ) fitting results. It can be seen that the traditional loop fitting result represented by the A curve not only does not reflect the existence of the spoofing signal, on the contrary, in order to make the results of E and L the same, the receiver is successfully deceived.

[0062] like figure 1 A method for estimating spoofing signal parameters with a GNSS receiver interference-to-signal ratio of 6.02 dB is shown, including step (1) comparing the digital intermediate frequency signal from the GNSS receiver antenna and the local phase difference generated according to the Doppler frequency output by the carrier NCO ...

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Abstract

The invention provides a method for estimating spoofing signal parameters of a GNSS receiver, comprising the steps of: (1) comparing a digital intermediate frequency signal from a GNSS receiver antenna and a local Doppler frequency output according to a carrier NCO to two channels with a phase difference of 90 degrees. The sine / cosine signals are input into the mixer; (2) the output results of the two mixers and the locally generated C / A codes with different code phases are input into the multi-channel correlator for correlation operation, and the multi-channel After the correlator operation, the output signal becomes a real baseband signal containing only navigation data information. By extending the iterative state estimation of the Kalman filter, the present invention calculates in real time the respective signal energy of the GNSS signal and the spoofing signal and the code interval between the final spoofing position, thereby improving the anti-jamming capability and anti-spoofing capability of the GNSS receiver. .

Description

technical field [0001] The present invention relates to a method for estimating spoofing signal parameters of a GNSS receiver. Background technique [0002] Whether in people's daily activities or in military, aviation, aerospace applications, etc., people's demand for Global Navigation Satellite System (GNSS, Global Navigation Satellite System) is getting higher and higher, which can bring people cheap and accurate space Location information positioning, but there are some problems in itself. Satellite signals arrive at the ground with very little energy, which makes GNSS receivers particularly vulnerable to jamming or spoofing, resulting in positioning errors. The spoofing signal means that the spoofing device transmits a signal similar to the satellite signal but with different power carrying spoofing information, which makes the GNSS receiver obtain wrong positioning information, thereby inducing the receiver carrier to deviate from the desired trajectory. The wrong lo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/21
CPCG01S19/215
Inventor 岳帅许睿刘建业曾庆化孟骞熊智
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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