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A Modeling Method for Stochastic Characteristics of Multi-frequency GNSS Observations

A modeling method and observation value technology, applied in measurement devices, special data processing applications, radio wave measurement systems, etc., can solve problems such as lack of methods, and achieve optimal positioning results, convenient positioning results, and simple and easy calculation process. Effect

Inactive Publication Date: 2017-06-13
TONGJI UNIV
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Problems solved by technology

At present, methods for random model evaluation of existing and newly added GNSS observations are relatively scarce. In order to make up for the lack of this aspect, the present invention provides a complete set of GNSS random characteristic data processing methods, so that users can obtain GNSS observations the random nature of the value

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  • A Modeling Method for Stochastic Characteristics of Multi-frequency GNSS Observations

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[0046] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0047] Such as figure 1 As shown, a multi-frequency GNSS observation stochastic characteristics modeling method includes the following steps:

[0048] In step a, to obtain multi-frequency GNSS observation data, the same type of receiver and antenna must be used at both ends of the baseline, and the antennas must point to the same direction.

[0049] In step b, data preprocessing is performed on the data, mainly including: satellite cut-off elevation angle, time scale correction, phase observation value cycle slip detection and repair, gross error detection and processing, and other n...

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Abstract

The invention relates to a method for modeling random characteristics of multi-frequency GNSS (global navigation satellite system) observed values. The method comprises the following steps of acquiring multi-frequency GNSS observed data, and preprocessing the data; constructing a single difference observation equation to form an intersite single difference observed value; performing parameter reforming on the single difference observation equation according to a base line and fixed double-difference ambiguity; taking the average value of single difference observed values of single-epoch multiple satellites as the least square solution of the reformed parameter, and subtracting the least square solution from the single different observed value of each satellite to obtain single difference observation noise; calculating the accuracy of non-difference observed values of single-epoch multi-frequency GNSS different-type observed values, cross-correlation coefficients of the different-type observed values and temporal correlation coefficients of the same-type observed values by utilizing the extracted observation noise; obtaining a relation between the accuracy of the observed value of each satellite and an elevating angle; modeling, outputting model parameters and establishing a variance-covariance matrix. Compared with the prior art, the method has the advantages of simple calculating process, reliability and the like.

Description

technical field [0001] The invention relates to a positioning technology for surveying, mapping and navigation, in particular to a modeling method for random characteristics of multi-frequency GNSS observation values. Background technique [0002] Since the civilian use of GPS in the 1980s, satellite navigation and positioning systems have been widely used in geodetic surveying, engineering surveying, meteorological monitoring, and determination of geodynamic parameters of the earth's rotation. The modernization of GPS has been going on continuously. The first GPS IIR-M satellite was successfully launched into orbit on September 26, 2005, becoming the first to broadcast civil C / A code navigation messages (L2C) on the L2 channel. satellite. So far, 8 Block IIR-M satellites have been launched. At the same time, the addition of L5 frequency signals on newly launched Block IIF satellites is the most iconic project in GPS modernization. In order to overthrow the monopoly posit...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00G01S19/23
Inventor 李博峰楼立志沈云中王俪霏
Owner TONGJI UNIV
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