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Methods for encoding and decoding observed value file of global positioning system

A technology of global navigation system and coding method, which is applied in the fields of instruments, computing, electrical digital data processing, etc., can solve problems such as insufficient processing of massive data volume of large projects, general compression effect, etc., and achieve ideal effect and fast compression speed. , the effect of reducing the loss of data

Inactive Publication Date: 2011-08-17
WUHAN UNIV
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Problems solved by technology

The method of saving the difference between epochs or the Huffman algorithm is used to compress the GPS observation files in RINEX format. The compression rates are about 70% and 45% respectively. The compression rate and compression speed also have certain limitations. Handling of massive data volumes for projects

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  • Methods for encoding and decoding observed value file of global positioning system
  • Methods for encoding and decoding observed value file of global positioning system
  • Methods for encoding and decoding observed value file of global positioning system

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Embodiment Construction

[0021] The data compression coding of the present invention is aimed at the processing of GPS observation data files in RINEX format (including the observation value file header and data records). In the embodiment, the compression method is carried out for the following parts, and the specific description is as follows:

[0022] 1 Process the file header of the observation value file

[0023] The file header of the observation value file is used to store global information related to the entire observation value file. Compared with the epoch data of the observation value file, the file header size of the RINEX observation data file is almost negligible, and the main body of compression is the epoch data. However, for higher compression efficiency, in addition to the epoch data compression scheme of the observation value file, the present invention further proposes that the file header can also be compressed, and redundant information contained in the file header can be delet...

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Abstract

The invention discloses methods for encoding and decoding an observed value file of a global positioning system (GPS), and mainly aims at management of data transmission and data storage in a network system of a high-frequency sampling large-size reference station. In the methods, a plurality of epoch data are used as a storage unit stored into a single module; in each single module, the epochs of an original file corresponding to the single module are processed by a secondary subtraction method so as to finally form a compressed data sequence to replace the position of the corresponding data in the original file. By adopting the technical scheme, the compression ratio is within 5 percent; as to the file compression in a network real time kinematic (RTK) system, the method is quick and efficient; and the pressure of a data link for transmitting the data is relieved and the cost for data transmission is reduced.

Description

technical field [0001] The invention belongs to the technical field of global navigation systems, in particular to a method for encoding and decoding observation value files of the global navigation system. Background technique [0002] The English of the global navigation system is Global Positioning System, which is commonly referred to as GPS in this field. GPS post-event observation data are transmitted and maintained in the form of files. The file format generally adopts the standard RINEX format. RINEX format is a general GPS data exchange format file, including observation data files, ephemeris files, meteorological data files, etc. At present, all survey GPS receiver manufacturers provide tools for converting their proprietary format files into RINEX format files, and almost all post-event data analysis and processing software can directly read RINEX format data. Since collecting observation data is a problem in field work, lossless coding and compression of data fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/30
Inventor 楼益栋宋伟伟易文婷陈昊
Owner WUHAN UNIV
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