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GNSS observation value compression and decompression method based on sexagesimal system

A compression method and observation value technology, which is applied in the field of navigation satellite applications and data processing, can solve the problem of large data volume, achieve high compression efficiency, simple calculation method, and reduce length

Inactive Publication Date: 2012-12-05
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above system receives a large amount of observation data, which can meet the needs of different users, but the amount of data is also large, which brings new problems to data storage and transmission.

Method used

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  • GNSS observation value compression and decompression method based on sexagesimal system
  • GNSS observation value compression and decompression method based on sexagesimal system
  • GNSS observation value compression and decompression method based on sexagesimal system

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Embodiment Construction

[0030]The present invention proposes to store GNSS observed values ​​based on sexagesimal system and store three difference observed values ​​between epochs, which is the key to realize efficient compression of GNSS.

[0031] The base number of the sexagesimal system is 60, represented by 60 different symbols, and the embodiment of the present invention adopts 0, 1, ..., 9, a, b, ..., y, z, A, B, ..., W, X to represent 0 to 59. The counting law is "every sixty to one" or "borrow one to sixty". Table 1 is a comparison table of sexagesimal and decimal conversion. In the table, 10# represents a decimal number, and 60# represents a sexagesimal number.

[0032] Table 1

[0033]

[0034] The calculation method of the third-order recursive difference algorithm of the present invention is shown in the left part of Table 2, and the specific method is: (1) the first observation value is output as it is; (2) the observation value of the second epoch adopts a difference, that is; (3 ...

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Abstract

The invention belongs to the field of navigation satellite applications and data processing, in particular to a new GNSS observation value data compression and decompression method which comprises the compression and the decompression of rough coordinates and antenna height information in GNSS observation values, the compression and the decompression of time data based on a sexagesimal system, the compression and the decompression of satellite numbers based on the sexagesimal system, the compression of the GNSS observation values based on the sexagesimal system and the recurrence differentialalgorithm, and the integration of the GNSS observation values based on the sexagesimal system and the recurrence integration algorithm.

Description

technical field [0001] The invention belongs to the field of navigation satellite application and data processing, in particular to a new GNSS observation data compression and decompression method. Background technique [0002] The Global Satellite Navigation System (GNSS) is a satellite-based radio positioning, navigation and timing system, which consists of the US Global Satellite Positioning System (GPS), which is already in operation, the Russian Global Satellite Navigation System (GLONASS), which is under construction, and the It is composed of the European Galileo system (GALILEO) and the Chinese Beidou satellite navigation system (COMPASS). [0003] GPS has been operating in good condition since it declared full operation (FOC) in 1995. There are currently 31 satellites in orbit. The main observations include carrier L1, L2, ranging codes C / A, P1, P2 and Doppler observation D1 , D2. In 1999, the United States announced the GPS modernization plan. In the future, the G...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/09G01S19/35
Inventor 李英冰闫景仙熊程波
Owner WUHAN UNIV
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