Authors / CoAuthors
Deo, M.N.
Abstract
The GPS and Galileo systems will transmit triple frequency signals which will be available freely to the GNSS user community. This provides an opportunity for users to form optimal linear combinations which have low noise, are free from ionospheric errors, have increased wavelength and have enhanced integer ambiguity resolution capability. This paper presents optimised linear combinations for GPS and Galileo which address these factors. Based on the theoretical development, the optimal combination is free from first order ionospheric effects and has less noise than any of the other dual frequency ionosphere free combinations. The optimal combination was validated using authentic triple frequency data from the recently launched Block IIF GPS satellite, PRN 25. It is shown that the noise in the optimal combination is lower than the L1/L2 and L2/L5 dual frequency ionosphere free combinations and at the same level as the L1/L5 combination. The optimal linear combination is ideal for undifferenced Precise Point Positioning (PPP) which requires an ionosphere free, low noise combination that does not necessarily have integer coefficients. However, the combination coefficients can be simply rounded to integer values to enhance integer ambiguity resolution and this gives similar results to studies elsewhere.
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nonGeographicDataset
eCat Id
71128
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- External Publication
- ( Theme )
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- geodesy
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_Internal
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2010-01-01T00:00:00
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