Time service receiver hardware delay calibration method and system based on clock correction compensation

A technology of hardware delay and calibration method, applied in the field of global navigation satellite system, can solve problems such as insufficient accuracy of hardware delay calibration, and achieve the effect of avoiding the influence of atmospheric errors, high-precision clock error, and improving calibration accuracy

Active Publication Date: 2020-06-05
WUHAN UNIV
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Problems solved by technology

[0005] Aiming at the problem of insufficient accuracy of the traditional hardware delay calibration method, the present invention provides a hardware delay calibration m...

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  • Time service receiver hardware delay calibration method and system based on clock correction compensation
  • Time service receiver hardware delay calibration method and system based on clock correction compensation
  • Time service receiver hardware delay calibration method and system based on clock correction compensation

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Embodiment Construction

[0046] One, at first introduce the method principle of the present invention in conjunction with accompanying drawing.

[0047] Such as figure 1 , for a timing receiver whose observation value extraction time is synchronized with 1PPS, a typical signal processing process: the satellite navigation signal 106 is first down-converted, filtered and sampled by the RF front-end 107 to obtain a digital intermediate frequency signal 104, and then the baseband processing module 101 performs a digital intermediate frequency signal 104 The signal is captured and tracked, and the observation value and ephemeris 102 are output. After the clock difference estimation module 103 is positioned and solved, the clock difference 105 of the timing receiver is obtained. The local clock 109 is adjusted according to the clock difference, and the local clock is fed back 108 to the satellite navigation signal. The receiving part forms a closed loop to keep the clock difference of the timing receiver at...

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Abstract

The invention discloses a time service receiver hardware delay calibration method and system based on clock correction compensation. The method is suitable for a time service receiver of which the observed value extraction time and the 1PPS are kept synchronous. Based on a signal processing process of the time service receiver, the invention provides a time service delay division method for emphasizing that satellite signals with different frequencies generate different hardware delays; on the basis, the invention further discloses a hardware delay measurement improvement scheme based on clockcorrection compensation; a common clock test system for a time service receiver and a satellite navigation signal simulator is built, a high-sampling-rate high-precision oscilloscope is used for measuring simulator delay of the satellite navigation simulator, a carrier phase smoothing pseudo-distance is used for distinguishing and receiving satellite signal frequency, clock difference is calculated, and therefore hardware delay calibration precision of the time service receiver is improved.

Description

technical field [0001] The invention belongs to the technical field of global navigation satellite systems (Global Navigation Satellite System, GNSS), in particular to a hardware delay calibration method of a GNSS timing receiver based on clock error compensation. Background technique [0002] Many infrastructures in the fields of communication, electric power, finance, and national defense are based on time synchronization. Now more and more high-tech applications require higher and higher time synchronization accuracy. Time comparison using satellite navigation system (GNSS) can achieve nanosecond-level time synchronization accuracy, but usually only time comparison between two nodes can be performed, and the comparison results are lagging. This type of technology is mainly used by time-frequency The laboratory is used for time transfer, not suitable for large-scale use. Time synchronization through GNSS timing has the advantages of low cost, real-time, unlimited number o...

Claims

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Application Information

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IPC IPC(8): G01S19/23
CPCG01S19/235
Inventor 郭文飞朱萌萌谭俊雄雷阳牛小骥赵齐乐
Owner WUHAN UNIV
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