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GNSS carrier loop circuit tracking method based on stochastic resonance algorithm

A stochastic resonance and carrier loop technology, applied in the field of global satellite navigation systems, can solve the problems of difficult to receive signal tracking, and achieve the effects of reliable and stable tracking, simple hardware implementation, and stable signal tracking.

Inactive Publication Date: 2015-11-25
PEKING UNIV
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  • Claims
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AI Technical Summary

Problems solved by technology

[0006] For receiving signals with high dynamics and low carrier-to-noise ratio, traditional phase-locked loops, frequency-locked loops, or frequency-locked loop-assisted phase-locked loop technologies are difficult to accurately and closely track the received signals

Method used

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  • GNSS carrier loop circuit tracking method based on stochastic resonance algorithm
  • GNSS carrier loop circuit tracking method based on stochastic resonance algorithm
  • GNSS carrier loop circuit tracking method based on stochastic resonance algorithm

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Embodiment Construction

[0028] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in combination with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are exemplary only, and are not intended to limit the scope of the present invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the present invention.

[0029] figure 1 It shows a structural block diagram of the GNSS carrier loop tracking system of the present invention.

[0030] Such as figure 1 As shown, the intermediate frequency signal after down-conversion by the receiver is used as the input signal of the loop; the carrier is removed through conjugate complex multiplication, and the baseband signal I(n) and Q(n) with residual frequency are obtained; then the stoch...

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Abstract

The invention discloses a GNSS carrier loop circuit tracking method based on a stochastic resonance algorithm. According to the invention, the signal to noise ratio of receiving signals is increased by integral accumulation and multiplication feedback treatment on input signals; rough tracking of frequency of the receiving signals is performed by utilizing a second-order frequency locking loop; and precise tracking is performed on the signals subjected to rough tracking by adopting a third-order phase locking loop. Therefore, precise carrier loop circuit tracking on the GNSS signals is realized in a low carrier-to-noise ratio. According to the invention, an advantage of the stochastic resonance algorithm in an aspect of improving the signal to noise ratio and an advantage of anti-interference and robustness of the cooperation of the second order frequency locking loop and the third-order phase locking loopare integrated effectively. The method is simple in hardware implementation and stable in signal tracking, and can realize stable and reliable tracking of highly dynamic satellite signals by a receiver in a severe environment.

Description

technical field [0001] The invention belongs to the field of global satellite navigation systems, and in particular relates to a GNSS carrier loop tracking method based on a stochastic resonance algorithm. Background technique [0002] In the GNSS system, due to the relative motion between the satellite and the receiver, the frequency drift of the satellite clock and the receiver crystal oscillator and other factors, the received satellite signal will have a certain Doppler frequency offset, which is unpredictable . [0003] The noise temperature of the entire signal receiving system of the GNSS receiving system will be affected by sky background noise, antenna noise, line loss, ambient temperature and RF front-end noise, etc., making the signal-to-noise ratio of the received signal low. Moreover, when the receiver is working normally, the signal power that can be received indoors is 10-30dBW lower than that outdoors, which will lead to extremely low signal-to-noise ratio o...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/29
CPCG01S19/29
Inventor 陶林孟凡琛刘哲林俊华朱柏承李仁先
Owner PEKING UNIV
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