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Imported Doppler observation value construction method in consideration of clock jumps of GNSS receiver

A construction method and receiver clock difference technology, applied in the field of satellite navigation and positioning, can solve problems affecting the execution efficiency of the method, achieve the effect of avoiding cycle slip detection and repair process, and improving execution efficiency

Pending Publication Date: 2017-05-31
THE FIRST MONITORING CENT OF CHINA EARTHQUAKE ADMINISTATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method will cause all satellites at the time of the clock jump to be judged as having a cycle slip, and then need to repair the cycle slip of each satellite, resulting in many unnecessary cycle slip detection and repair processes, which affects the accuracy of the method. effectiveness

Method used

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  • Imported Doppler observation value construction method in consideration of clock jumps of GNSS receiver
  • Imported Doppler observation value construction method in consideration of clock jumps of GNSS receiver
  • Imported Doppler observation value construction method in consideration of clock jumps of GNSS receiver

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Embodiment 1: static simulation dynamic experiment.

[0028] The METS station in the IGS (International GNSS Service, International GNSS Service) observation network is selected as an example object. For the static observation data, in a theoretical sense, its velocity and acceleration have a true value, which is "0", and comparing the results with it can be used to evaluate the effect of the method of the present invention.

[0029] figure 1 It shows a flow chart of a method for constructing derived Doppler observations in consideration of GNSS receiver clock jumps disclosed by the present invention, and the method includes the following steps:

[0030] (a) Receive GNSS pseudo-range, carrier phase and other observation data and broadcast ephemeris;

[0031] In this step, download the original observation data and broadcast ephemeris of METS station 2011-04-10 (annual cumulative days: 100), the data sampling rate is 1Hz, and the selected data time range is from 00:00:...

Embodiment 2

[0043] Embodiment 2: Dynamic airborne experiment.

[0044] The GPS data collected by an aviation Lidar measurement experiment is selected for analysis. The TRIMBLE4000SSI receiver is used. The data sampling rate is 1Hz. The total data duration is 3 hours and 50 minutes, including the process of aircraft takeoff, flight and landing.

[0045] in accordance with figure 1 The steps of the method of the present invention shown are calculated:

[0046] (a) Receive GNSS pseudo-range, carrier phase and other observation data and broadcast ephemeris.

[0047] (b) Use the pseudorange to calculate the standard single point positioning by epoch, and obtain the result of the clock difference sequence, as shown in Figure 6 shown.

[0048] (c) Using the clock difference sequence to construct the clock jump test quantity T CR , when T CR When ≥0.5ms, it is considered that there is a clock jump, Figure 7 It is the clock jump of the airborne experiment. It can be seen that the clock jum...

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Abstract

The invention discloses an imported Doppler observation value construction method in consideration of clock jumps of a GNSS receiver. Firstly a clock difference of the receiver is calculated by means of pseudo range single-point positioning. Then a clock difference sequence is utilized for constructing a clock jump inspection amount and clock jump judgment is performed. If the clock jumps exist, a clock surface sampling time mark of the receiver is modified for being corresponding with an observed value of a carrier phase. Finally a one-order phase central difference method is utilized for constructing a Doppler observation value. According to the imported Doppler observation value construction method, in a manner of modifying the sampling time mark instead of the carrier phase observation value, the carrier phase observation value corresponds with a true sampling time mark, thereby effectively preventing many unnecessary cycle slip detecting and restoring processes, remarkably improving execution efficiency, accuracy and reliability in construction and importing of the Doppler observation value.

Description

technical field [0001] The invention belongs to the technical field of satellite navigation and positioning, and in particular relates to a method for constructing derived Doppler observation values ​​in consideration of GNSS receiver clock jumps. Background technique [0002] Velocity and acceleration are important parameters to characterize the motion state of an object. The emergence of GNSS provides a new method for obtaining the velocity and acceleration of a moving carrier with high precision. Usually, Doppler observations are used to directly solve the velocity / acceleration of the carrier. When using this method to solve the problem, it is necessary for the GNSS receiver to output Doppler observations, but in practical applications, not all GNSS receivers can output original Doppler observations. For GNSS that cannot output original Doppler observations The receiver needs to use the carrier phase observation value to construct the Doppler observation value, which is r...

Claims

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Application Information

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IPC IPC(8): G01S19/29
CPCG01S19/29
Inventor 郭博峰郭斐郑凯李永昆
Owner THE FIRST MONITORING CENT OF CHINA EARTHQUAKE ADMINISTATION
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