Abstract
In the Global Navigation Satellite System (GNSS), the multipath error affected by many aspects is the main error source that affects satellite navigation, and it is difficult to establish a much more accurate model to analyze it. Based on the ground multipath reflection model, it firstly deeply studies the influence of GNSS satellite orbit parameters on multipath fading frequency and establishes a multipath signal model related to satellite orbit parameters. Secondly, the influence of carrier phase cycle slip, receiver clock adjustment, and GNSS satellite orbit on multiparameter- (MP-) combined observations is analyzed in detail based on the measured data. Finally, aiming at the common phenomenon of code-carrier divergence in the Beidou system, the elevation-based pseudorange correction model and a sidereal filtering are built to correct the MP errors; experiments with measured data show that there is a fluctuation range reduction of 35.7% after sidereal filtering when the receiver reaches a steady state.
Highlights
Literature ReviewMultipath is the main systematic error of the Global Navigation Satellite System (GNSS) short baseline positioning. Multipath error cannot be eliminated by the double-differenced technique and is difficult to parameterize, which severely restrict the high-precision GNSS positioning application
An advanced receiver autonomous integrity monitoring (ARAIM) method is proposed to evaluate Global Navigation Satellite System (GNSS) integrity in [18], which mainly focuses on validating whether the multipath error model in the ARAIM algorithm is conservative enough for GEO satellites
Correction of multipath error in code observation the elevation-based pseudorange correction model, the mean value of the all-day pseudorange measurement must remain unchanged; the pseudorange measurement noises of the two consecutive days are independent, even if the lowpass filter has filtered out the high-frequency component of the noise; the cost of the sidereal filtering is the increase of the measurement noise
Summary
Multipath is the main systematic error of the GNSS short baseline positioning. Multipath error cannot be eliminated by the double-differenced technique and is difficult to parameterize, which severely restrict the high-precision GNSS positioning application. An advanced receiver autonomous integrity monitoring (ARAIM) method is proposed to evaluate GNSS integrity in [18], which mainly focuses on validating whether the multipath error model in the ARAIM algorithm is conservative enough for GEO satellites. Is technique aims to avoid the typical cancellation phenomenon between signal and correlated multipaths, by exploiting the known power of the direct signal at the receiver. To this effect, a measure of the correlation between the signal and multipaths is obtained in the matrix form, and it is subtracted from the spatial correlation matrix of the received signal.
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