Continuous wave interference detection and identification method based on phase-amplitude locking loop

A technology of locking loop and identification method, which is applied in the field of GNSS receiver anti-jamming, and can solve the problems of increased positioning error, inability to locate, and increased noise in the receiver tracking loop.

Active Publication Date: 2019-12-10
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0003] Suppressive jamming is one of the worst intentional electromagnetic jamming, which can block satellite signals, causing receiver tracking loop noise to increase, which in turn leads to increased positioning errors, or even inability to locate

Method used

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  • Continuous wave interference detection and identification method based on phase-amplitude locking loop

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Embodiment Construction

[0071] Below in conjunction with embodiment the present invention will be further described.

[0072] The suppressive interference detection and identification method based on the phase-amplitude locked loop disclosed by the present invention can be completed through software algorithms, mainly including a mixer, an integrator, a phase detector, a second-order low-pass filter, and a differentiator , numerically controlled oscillator (numerical controlled oscillator, NCO), estimator and other program modules.

[0073] A continuous wave interference detection and identification method based on a phase-amplitude locked loop, the mixed signal r of the continuous wave interference and GNSS signal IF (n) input to the mixer, mixed signal r IF (n) respectively with the in-phase local carrier signal and quadrature-phase local carrier signal frequency mixing, where the mixed signal r IF (n) with the in-phase local carrier signal Mixing to get the in-phase mixing result i r (n),...

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Abstract

The invention discloses a continuous wave interference detection and identification method based on a phase-amplitude locking loop. According to the method, a time domain front-end interference detection and identification technology is adopted to carry out detection and feature identification on common continuous wave interference. The method comprises the following steps: firstly, improving a traditional phase locked loop (PLL), and improving the tolerance of the PLL to dynamic stress by adopting a differential-auxiliary (DA) PLL; secondly, estimating the frequency of continuous wave interference through PLL assisted by a differentiator; on the basis of estimation parameters of PLL assisted by a differentiator, the amplitude of continuous wave interference is estimated through an amplitude locked loop (ALL), detection and identification of the continuous wave interference are achieved according to the estimated frequency and amplitude, and a basis is provided for research of a continuous wave interference suppression method.

Description

technical field [0001] The invention belongs to the technical field of GNSS receiver anti-jamming, and particularly relates to a continuous wave interference detection and identification method based on a phase-amplitude locked loop, which detects common continuous wave interference and identifies its characteristics and types, so as to serve as a follow-up anti-continuous The study of wave interference algorithm provides the necessary reference information. Background technique [0002] Global Navigation Satellite System (GNSS) provides all-day, all-weather high-precision position, speed and time information for users in various fields of sea, land, air and space, and has gradually become one of the most important contemporary infrastructures. However, due to the loss of satellite signals after long-distance propagation, the power when reaching the ground is only about -160dBW, which is easily affected by unintentional or intentional electromagnetic interference, threatenin...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/21
CPCG01S19/21
Inventor 许睿严乾君岳帅曾庆化刘建业陈武
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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