A GPS Clock Compensation Method Based on Generalized Weighted Least Squares Method
A technology of least square method and GPS clock, which is applied in the direction of radio-controlled timer, synchronization error correction, time division multiplexing system, etc., and can solve the problem of low precision of clock output
Active Publication Date: 2021-04-16
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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[0004] The purpose of the present invention is to propose a GPS receiver based on the generalized weighted least squares method for the problem that the clock output accuracy of the GPS receiver is not high after the GPS receiver is clock compensated by the ordinary least squares method in the prior art. The clock compensation method further improves the accuracy of the clock output of the GPS receiver, which can provide accurate time scales for applications such as wide-area measurement and fault location, and meet the online wide-area timing requirements of the power grid monitoring system
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Embodiment 1
[0052] Use a company's time synchronization device to collect 1PPS (generated by decoding satellite signals, there are random errors) and the PPS output after compensation by the method of the present invention, use an oscilloscope to observe, and conduct a 1h simulation experiment. At the beginning of the experiment, adjust the reference axis of the oscilloscope to coincide with the rising edge of the compensated PPS, such as figure 2 As shown in (a); the comparison waveform of 1PPS and PPS at 30min of the experiment is as follows figure 2 Shown in (b); the comparison waveform at 60min of the experiment is as follows figure 2 (c) shown. From figure 2 It can be seen that relative to the reference axis, the error of the PPS generated by this method is less than the random error of 1PPS, and it can still maintain a high time accuracy for a long time in the case of random errors in GPS, indicating that this method can improve the time accuracy. The accuracy of the output t...
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A GPS clock compensation method based on the generalized weighted least squares method, the method is to receive the GPS second pulse 1PPS sent by the GPS receiver and the crystal oscillator second pulse PPS generated based on the local high-precision crystal oscillator through the time difference measurement module, and measure 1PPS and PPS and send the measured time difference to the MCU in the error compensation module; the MCU receives the time difference between 1PPS and PPS, and establishes a clock compensation model based on the generalized weighted least squares method to calculate the random error of 1PPS and the PPS Accumulate error, compensate for 1PPS and PPS. The present invention considers the accumulated error of the second pulse of the crystal oscillator and the random error of the second pulse of the GPS, utilizes the complementary characteristics of the two, and establishes the method to output the precise second pulse. The method can improve the precision of the output time of the time synchronization device.
Description
technical field [0001] The invention relates to the technical field of power system automation, in particular to a GPS clock compensation method based on a generalized weighted least square method. Background technique [0002] For any communication device, a clock is required to provide its operating frequency, so the clock performance is an important aspect that affects the performance of the device. In the power automation system, the high-precision synchronous clock plays a vital role in the wide-area measurement and remote control of the power system. For the WAMS wide-area measurement and control system, it depends on the high consistency of time. Even a time deviation of 0.12ms, which is converted into a power angle difference of 2.16°, will lead to wrong control decisions. [0003] GPS receiver is a common equipment in power system satellite timing system. However, GPS receiver has second pulse error. Traditionally, the least square method is often used to compensat...
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IPC IPC(8): H04J3/06G04R20/02H04L7/00
CPCG04R20/02H04J3/0638H04L7/0016
Inventor 钱斌蔡梓文肖勇杨劲峰周密郑楷洪
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD