Detection method of real-time GPS (Global Position System) carrier phase cycle slip for frequency taming

Abstract

The invention discloses a detection method of real-time GPS (Global Position System) carrier phase cycle slip for frequency taming. The detection method comprises the following steps: S1, calculating an observed value of an MW (Melbourne-Wubbena) wide lane combination, S2, estimating ambiguity of an MW wide lane, S3, calculating a cycle slip decision item, S4, calculating a cycle slip decision threshold, judging whether the cycle slip decision item exceeds the cycle slip decision threshold, and moving to Step S5 if not, S5, calculating an electron content change rate of an ionized layer of an epoch (k), S6, predicting TECR (Total Electron Content Change Rate) value of the epoch (k) according to history data, and S7, calculating a detection threshold of a TECR method, calculating the difference between a calculated value and a predicted value of the epoch (k), and judging whether the detection threshold of the TECR method is exceeded. The method is combined with a constraint condition limitation that the total electron content change rate of the ionized layer is limited in a short period, shows the same cycle slip on L1 and L2 frequency points via linear combination of a carrier phase observation equation, and covers the shortage of an MW method.

Description

technical field [0001] The present invention relates to data processing methods. More specifically, it relates to a method for detecting real-time GPS carrier phase cycle slips for frequency taming. Background technique [0002] GPS carrier phase technology can not only achieve high-precision positioning, surveying and navigation, but also has important applications in time transfer and frequency taming. For frequency taming, the use of carrier phase observations instead of traditional C / A code observations, because the carrier frequency is about 1000 times higher than the C / A code rate, can better suppress receiver thermal noise and atmospheric delay, and improve Accuracy and stability of taming frequency sources, where atmospheric delays include ionospheric and tropospheric delays. Moreover, due to the stability of the carrier phase observation, the tame frequency standard can reach its predetermined working performance index in a shorter time. [0003] For the carrier ...

AI Technical Summary

Problems solved by technology

Due to the low accuracy of code measurement, the code-phase comparison method cannot repair small cycle slips of 1 to 2 cycles; the Doppler integration method is also unable to repair small cycle slips; It is insensitive, and it is impossible to judge which frequency point the cycle slip occurs at; the time-phase difference method needs to perform polynomial fitting data interpolation or extrapolation on the detection epoch, and polynomial fitting cannot guarantee that all detections are successful, especially When the cycle slip is small

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