Abstract
GNSS positioning has become popular in the past decade as an efficient method of precise and real-time positioning. It is relatively low cost and ease-of-use. Up to now, several parameters were defined to characterize the performance of real-time positioning: availability, precision, accuracy. This article evaluates the performance of signal linear combinations for real-time positioning, both for static as well as the kinematic positioning. This article starts with the investigation of linear combinations (LC) rising from the carrier frequencies of the GNSS systems. Some Linear Combination shows potential benefits in carrier phase integer ambiguity resolution, particularly utilizing the Galileo and Beidou signal phase carrier. For each system, a set of combinations was studied, analyzed, and then selected during the development of GNSS positioning method utilizing the Least-squares Ambiguity Decorrelation Adjustment (LAMBDA). Special signal selection can affect the estimated position and its standard deviation. To further analyze, the results obtained from data processing are compared with respect to baselines and signals. The ambiguity fixing rate is correlated with the baseline length and the method as well as the signals that were used. The analysis of the measurement noise level was first conducted to set a baseline for the real-time GNSS positioning application. According to the results and to assess the data quality and positioning performance of GNSS in respect with GPS (Global Positioning System), an experimental test has established using MGEX data. This research investigates the satellite visibilities, multipath, Signal to Noise Ratio (SNR), and positioning performance. It is shown that in every epoch, at least 8 satellites are visible. The SNR’s are up to 60 dBHz, the code multipath residuals varies within ~1 m, while the phase residuals varies by about ~2 cm. hence the modernized GNSS signals have potencies to improves the RTK positioning.
Highlights
Satellite based navigation technology is continuously and rapidly growing in recent time
Galileo System (GAL) and BeiDou System (BDS) is entering the third phase of development that is expected to enhance the positioning performance will continue to the final phase on 2020 with global coverage of positioning and navigation system by a constellation of 35 satellites, which are consists of 5 Geostationary Earth Orbit (GEO) satellites, 3 Inclined Geosynchronous Orbit (IGSO) satellites and 27 Medium Earth Orbit (MEO) satellites [1]
Result from data processing shows that a combined signal (GPS+BDS and GPS+GAL) can be improved the resolution time when the GEO satellites is introduced for ambiguity fixing in case of obstruction problems
Summary
Satellite based navigation technology is continuously and rapidly growing in recent time. The Global Navigation Satellite System (GNSS) are Galileo System (GAL) and BeiDou System (BDS), which is developed and operated by European Union and China. Differs from GPS, BDS adopts the China Geodetic Coordinate System 2000 (CGCS2000) as the coordinate system and BeiDou navigation satellite system time (BDT) as the time system of BDS. The combination of GPS, GAL, and BDS can increase the observation data quality as well as the positioning performance [1]. Further research over GNSS data quality and positioning performance in Indonesia is needed. To assess the data quality and positioning performance GNSS in respect with GPS (Global Positioning System) over Indonesia, an experimental network had established using MGEX data. This research investigates the satellite visibilities, multipath, Signal to Noise Ratio (SNR), and the positioning performance
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