Research on Multi-Frequency Observation Linear Combination of GNSS
1 Key Laboratory for Land Environment and Disaster Monitoring of NASMG, China University of Mining & Technology，
Abstract The combination of the phase observations between different frequencies is presented, using the Galileo four frequency as an example| and the general form of combination observation in the unit of cycles and meters is given. The ionospheric error, wavelength and the observation noise is analysized in detail. With the integer ambiguity as a prerequisite, some useful linear combination as long wavelength, weak ionospheric delay and weak observation noise is researched. Finally, depending on the combination principle, programming to calculate combination coefficients of different navigation system and several typical combination coefficients are given.
Key words ：
GNSS
linear combination
ionospheric delay
observation noise
integer ambiguity
Received: 10 May 2014
Published: 02 June 2015
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