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Satellite navigation receiver local time correction method and positioning method

A satellite navigation and receiver technology, applied in the field of global navigation satellite system positioning, can solve the problems of discontinuous observation, wrong observation, affecting the extraction time of observation, etc., to avoid continuous multiple corrections of TMCR, reduce influence, The effect of improving timing accuracy

Active Publication Date: 2014-08-20
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0021] For the three observations (pseudorange, carrier phase, and smoothed pseudorange) of the receiver, if the local time is corrected, it will affect the extraction time of the observations. If no compensation is made, the observations will be discontinuous, or even Observation error and other issues

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  • Satellite navigation receiver local time correction method and positioning method
  • Satellite navigation receiver local time correction method and positioning method
  • Satellite navigation receiver local time correction method and positioning method

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Embodiment Construction

[0057] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0058] The invention provides a method for correcting the local time of a satellite navigation receiver, the process of which is as follows figure 1 As shown, the specific steps are as follows:

[0059] Step 1, use the information obtained from the first frame synchronization to preset the TIC for rough correction.

[0060] In the receiver, the local time system is maintained through various levels of TIC (Time Interval Counter, time interval counter) counters inside the receiver. In order to be consistent with the format of GNSS time, the local TIC is designed as: TIC Week Counts weeks, without counting months and years above, TIC Second counts seconds for the week, with TIC Week Omit hours and days between counts. TIC Section is the count value of the 100ms level counter, TIC 100μs It is the count value of the 100μs counter, which is the smallest ...

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Abstract

The invention discloses a satellite navigation receiver local time correction method and positioning method. Due to the method, time service accuracy can be improved, meanwhile, the carrier phase and the pseudo observation quantity can be compensated for, a carrier phase smoothing filter is made to work normally, and positioning is achieved. After a receiver is powered on, TIC presetting is performed when frame synchronization occurs at the first-time, a TIC is firstly subjected to rough adjustment through the difference between GNSS time and local time of the receiver, then, the TIC is further subjected to fine adjustment by adjusting a TMCR value through clock correction of the receiver, and a receiver clock and a GNSS clock can be synchronous rapidly and accurately through the rough adjustment mode and the fine adjustment mode. According to the method, the carrier phase and the pseudo observation quantity are further compensated for, the defect of the hopping of the observation quantity extracting time moment caused by correction on a local TIC is overcome, and therefore the carrier phase can be accurately calculated, and the carrier phase smoothing filter can normally work.

Description

technical field [0001] The invention relates to the technical field of global navigation satellite system positioning, in particular to a local time correction method and a positioning method of a satellite navigation receiver. Background technique [0002] In GNSS (Global Navigation Satellite System, Global Navigation Satellite System), each GNSS satellite is generally equipped with multiple rubidium (Rb) atomic clocks and cesium (Cs) atomic clocks, and then the GNSS ground monitoring part selects one of the atomic clocks as the satellite The time and frequency reference signal source on the Due to price considerations, GNSS receivers generally use much cheaper quartz crystal oscillators as time and frequency sources. However, crystal oscillators are not as accurate and stable as rubidium and cesium atomic clocks. After a long period of accumulation, the local time of the receiver will differ greatly from the GNSS time. [0003] The deviation between the GNSS time and the...

Claims

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Application Information

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IPC IPC(8): G01S19/23G01S19/43
CPCG01S19/23G01S19/43
Inventor 张磊刘硕李健刘峰张丽
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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