Global navigation satellite system (GNSS) signal receiver spoofing signal parameter estimating method

A technology of signal parameters and receivers, applied in satellite radio beacon positioning systems, measuring devices, instruments, etc., can solve the problem of less spoofing signal parameters, improve anti-jamming and anti-spoofing capabilities, improve utilization, and improve The effect of stability and precision

Active Publication Date: 2019-01-11
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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  • Global navigation satellite system (GNSS) signal receiver spoofing signal parameter estimating method
  • Global navigation satellite system (GNSS) signal receiver spoofing signal parameter estimating method
  • Global navigation satellite system (GNSS) signal receiver spoofing signal parameter estimating method

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Embodiment Construction

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

[0061] Such as figure 2 As shown, the fitting curve of the receiver tracking correlation results for the signal with an interference-to-signal ratio of 6.02dB (the power of the spoofing signal is twice that of the GNSS signal). ) 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, but in order to make the results of E and L the same, the receiver is successfully deceived.

[0062] Such as figure 1 A kind of GNSS receiver interference-to-signal ratio shown is 6.02dB spoofing signal parameter estimation method, comprises step (1) the phase difference that the digital intermediate frequency signal from GNSS receiver antenna and the Doppler frequency that local output according to carrier NCO produces Two channels of sine / cosine signals with 90 degrees are ...

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Abstract

The invention provides a global navigation satellite system (GNSS) receiver spoofing signal parameter estimating method. The GNSS receiver spoofing signal parameter estimating method comprises the steps that (1) a digital intermediate-frequency signal from a GNSS receiver antenna and two paths of sinusoidal / cosine signals, with the 90-degree phase difference, locally generated according to the Doppler frequency output by a carrier wave NCO are input into frequency mixers; and (2) output results of the two branch frequency mixers and C / A codes of locally generated different code phases are input into a multichannel correlator to be subjected to correlation operation, and output signals operated by the multichannel correlator become real baseband signals only containing navigation data information. According to the GNSS receiver spoofing signal parameter estimating method, by extending iterative state estimation of a Kalman filter, signal energy of GNSS signals and spoofing signals, thecode interval between the GNSS signals and a final spoofing position as well as the code interval between the spoofing signals and the final spoofing position are calculated in real time, and thus theanti-jamming ability and anti-spoofing ability of a GNSS receiver are improved.

Description

technical field [0001] The invention relates to a method for estimating parameters of deception signals of a GNSS receiver. Background technique [0002] Whether it is 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 humans cheap and accurate space Location information positioning, but it also has some problems. Satellite signals are very weak when they reach the ground, which makes GNSS receivers particularly vulnerable to jamming or spoofing, resulting in incorrect positioning. The spoofing signal means that the spoofing device transmits a signal carrying spoofing information similar to the satellite signal but with different power, which makes the GNSS receiver get wrong positioning information, thereby inducing the receiver carrier to deviate from the expected trajectory. Errors in location i...

Claims

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Application Information

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