Extended SQM-based GNSS receiver baseband spoofing detection method

A spoof detection and receiver technology, applied in measuring devices, radio wave measurement systems, instruments, etc., can solve the problems of reduced detection effect and low detection effect of classic signal quality monitoring algorithms

Active Publication Date: 2019-12-31
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

At present, the classic signal quality monitoring algorithm uses the mean value of the symmetry index for hypothesis testing, and the detection effect is low. Especially when the deception si

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  • Extended SQM-based GNSS receiver baseband spoofing detection method
  • Extended SQM-based GNSS receiver baseband spoofing detection method
  • Extended SQM-based GNSS receiver baseband spoofing detection method

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Embodiment Construction

[0076] The present invention will be further described below in conjunction with the examples.

[0077] like figure 1 As shown, a GNSS receiver baseband spoofing detection method based on extended SQM, including multiplier, correlator, coherent integral operation, phase detector, spoofing detection device, loop filter, pseudo-code NCO, C / A code generation Inverter and carrier NCO, the input signal and the local copy of the carrier NCO output in-phase carrier signal through the multiplier output the branch of the sinusoidal mixed signal is called the in-phase branch, that is, the I branch, the input signal is orthogonal to the local copy of the carrier NCO output The branch of the carrier signal outputting the cosine mixed signal through the multiplier is called the quadrature branch, that is, the Q branch. The correlator outputs the correlation result i E , i P , i L , the cosine mixed signal output by the multiplier and the leading code, real-time code and lag code output...

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Abstract

The invention discloses an extended SQM-based GNSS receiver baseband spoofing detection method. A multiplier, a correlator, a coherent integration operation, a phase discriminator, a spoofing detection device, a loop filter, a pseudo code NCO, a C/A code generator and a carrier NCO are arranged. The method can ensure that the user receiver can timely convert the anti-spoofing structure or stop working in the spoofing environment, enhances the bearing capacity of the user carrier to the spoofing signal, improves the ability to resist the spoofing attack, and has important engineering significance and practical value.

Description

technical field [0001] The invention belongs to the technical field of GNSS baseband signals, and in particular relates to a baseband spoofing detection method of a GNSS receiver based on extended SQM. Background technique [0002] Since the advent of satellite navigation technology, the demand for Global Navigation Satellite System (GNSS) in various research fields has increased. Satellite navigation technology allows residents to easily know their location, but there are still shortcomings. When the receiver obtains the navigation signal, its energy is small, and if the user carrier is in a deception environment, it will be easily affected by deception, and eventually the navigation will fail. Similar to normal GNSS signals, spoofing signals are more powerful pseudo-signals that have been altered to the correct code phase by a spoofing device at a specific location. Ultimately, it will disable the user carrier from tracking the real signal, tricking the receiver into bein...

Claims

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Application Information

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IPC IPC(8): G01S19/21
CPCG01S19/215
Inventor 许睿岳帅严乾君刘建业曾庆化陈武
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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