Adaptive GNSS positioning method capable of adjusting to ionospheric delay
First Claim
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1. A satellite navigation positioning method, comprising:
- receiving n navigation signals from K navigation satellites, wherein the n navigation signals are on at least two different carrier frequencies, and wherein n is at least 8 and K is at least 4;
on a processor of a navigation receiver, calculating current coordinates based on the n navigation signals;
executing an adaptive positioning algorithm for adjusting parameter z representing a time constant of a rate of variation of ionospheric delay, and a scale factor s, which ranges from 1 to 10 and which relates to a baseline length and solar activity; and
correcting the calculated current coordinates based on the adaptive positioning algorithm.
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Abstract
A plurality of GNSS satellite signals feeds the signal processing engine operating in certain processing mode including carrier phase smoothed pseudorange positioning, precise point positioning (PPP), pseudorange differential (DGNSS), and carrier phase differential (RTK). The processing engine calculates two estimates of the ionosphere delay for each satellite: the filtered delay and the instant delay. Comparison of them allows to detect turbulent variation of the ionosphere and adjust parameters of two-parametric dynamic mode which improves positioning precision.
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Citations
8 Claims
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1. A satellite navigation positioning method, comprising:
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receiving n navigation signals from K navigation satellites, wherein the n navigation signals are on at least two different carrier frequencies, and wherein n is at least 8 and K is at least 4; on a processor of a navigation receiver, calculating current coordinates based on the n navigation signals; executing an adaptive positioning algorithm for adjusting parameter z representing a time constant of a rate of variation of ionospheric delay, and a scale factor s, which ranges from 1 to 10 and which relates to a baseline length and solar activity; and correcting the calculated current coordinates based on the adaptive positioning algorithm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification