GNSS observation value compression and decompression method based on sexagesimal system
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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 amount of data, and achieve the effect of high compression efficiency, fast compression speed, and no loss of compression results
Inactive Publication Date: 2010-12-15
WUHAN UNIV
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[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.
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[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 mode is: (1) the first observation value is output as it is; (2) the observation value of the 2nd epoch adopts a difference, that is; (3 ) the...
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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 Navigation Satellite System (GNSS) is a satellite-based radio positioning, navigation and timing system. 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 operational status (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 GPS system will provide more observation values, including L1, L2, L5, L1C, L2C, L5I, L5Q, P1, P2, M1, M2, D1, D2, D5 etc. Since GLONASS has FOC in 1996, due to economic and technical ...
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