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Global navigation satellite system (GNSS) single difference processing method of fixed reference satellite

A processing method and reference star technology, applied in satellite radio beacon positioning systems, measuring devices, instruments, etc., can solve discontinuous transmission of ambiguity parameters and clock error parameters between epochs, weak GNSS service capabilities, and low calculation efficiency etc., to achieve strong GNSS service capabilities, solve the problem of continuous transmission of ambiguity parameters and clock error parameters between epochs, and high calculation efficiency

Active Publication Date: 2017-04-19
INST OF GEODESY & GEOPHYSICS CHINESE ACADEMY OF SCI
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects and problems of discontinuous transmission of inter-epoch ambiguity parameters and clock error parameters, cumbersome operation, low calculation efficiency, and weak GNSS service capability in the prior art, and provide an inter-epoch ambiguity GNSS single-difference processing method for fixed reference satellites with continuous parameter and clock error parameter transmission, easy operation, high calculation efficiency, and strong GNSS service capability

Method used

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  • Global navigation satellite system (GNSS) single difference processing method of fixed reference satellite
  • Global navigation satellite system (GNSS) single difference processing method of fixed reference satellite
  • Global navigation satellite system (GNSS) single difference processing method of fixed reference satellite

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Embodiment 1

[0059] Example 1: Using a short baseline to analyze the impact of reference star fixation and replacement on double-difference ambiguity estimation

[0060] Data description and processing plan: In 2013, DOY275 days (DOY: Day Of Year, annual cumulative days) collected 24 hours of continuous GPS observation data at CUAA and CUT3 stations to form a baseline CUAA-CUT3, with a length of about 8.4km, used for related calculations See Table 1 for information. Among them, the cut-off elevation angle is set to 20° in order to eliminate the influence of multipath on the observed values ​​as much as possible. The single-difference processing scheme of fixing the reference star and the double-difference processing scheme of replacing the reference star are adopted to compare the influence of changing and fixing the reference star on the ambiguity continuity.

[0061] Table 1 Observation information and parameter settings used in the baseline calculation

[0062]

[0063] see figure...

Embodiment 2

[0088] Example 2: Using medium and long baselines to analyze the impact of reference satellite fixation and replacement on receiver clock error estimation

[0089] Data description and processing plan: In 2014, DOY collected observation data of STAR and LALB for 21 hours in 190 days to form a baseline STAR-LALB with a length of about 105 km. The information used in the calculation is shown in Table 2.

[0090] Table 2 The baseline solution uses observation information and parameter settings

[0091]

[0092] The GNSS single-difference processing method of the fixed reference star in this embodiment is the same as that in Embodiment 1. The baseline is relatively long, and the correlation of atmospheric errors is relatively weak. In the single-difference Kalman filter observation model, the state parameters include the residual ionospheric delay error and the tropospheric zenith delay error, and the residual ionospheric delay error and the tropospheric sky The top delay erro...

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Abstract

The present invention relates to a GNSS single difference processing method of a fixed reference satellite. The method comprises the following steps of A selecting a synchronous observation satellite which has a larger elevating angle at the beginning moment and is reliable in observation quality as the fixed reference satellite, and hypothesizing the satellite as the No.1 satellite; B constructing a station-between single difference Kalman filtering observation model taking the double-difference ambiguity as a parameter; C constructing a Kalman filtering state model; D starting a Kalman filter, and solving the parameters by taking a double-difference ambiguity parameter as a time invariant parameter. By the design, the problem that due to the change of the reference satellite, the double-difference ambiguity parameters between the epochs and the receiver clock offset parameters can not be transmitted continuously, is solved, and the GNSS single difference processing method of the fixed reference satellite is simple and convenient to operate, and is high in calculation efficiency and strong in GNSS service capability.

Description

technical field [0001] The invention belongs to the technical field of "geodesy" in the subject of "surveying and mapping science and technology", and in particular relates to a GNSS single-difference processing method with a fixed reference star, which is mainly suitable for solving double-difference ambiguity parameters and phase clock differences in GNSS relative positioning The problem of discontinuous transmission of parameters, so as to obtain reliable position, time, atmospheric information, etc. Background technique [0002] The Global Navigation Satellite System (GNSS for short) currently mainly includes GPS, GLONASS, Galileo and BDS. Its main function is that the GNSS receiver receives observation data such as phase, pseudorange and Doppler of multiple satellites and conduct Processing, to achieve navigation, positioning, speed measurement, timing, etc. In order to obtain high-precision relative positioning between different stations, double-difference positioning...

Claims

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Application Information

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IPC IPC(8): G01S19/44
CPCG01S19/44
Inventor 柴艳菊张宝成袁运斌欧吉坤
Owner INST OF GEODESY & GEOPHYSICS CHINESE ACADEMY OF SCI
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