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Improving Ambiguity Resolution for Medium Baselines Using Combined GPS and BDS Dual/Triple-Frequency Observations
Wang Gao1, Chengfa Gao2, Shuguo Pan3
1School of Transportation, Southeast University, Nanjing 210096, China. gaow@seu.edu.cn.
Sensors (Basel, Switzerland)
|November 4, 2015
Summary
Combining GPS and BeiDou navigation satellite system (BDS) observations improves real-time kinematic positioning. This integrated strategy significantly enhances ambiguity resolution performance and reduces initialization time for medium baselines.
Area of Science:
- Geomatics Engineering
- Satellite Navigation Systems
- Geodetic Surveying
Background:
- The BeiDou navigation satellite system (BDS) offers triple-frequency signals, enabling enhanced positioning capabilities.
- Real-time kinematic (RTK) positioning benefits from multi-system and multi-frequency observations for improved accuracy.
- Ambiguity resolution (AR) is crucial for precise carrier-phase-based GNSS positioning.
Purpose of the Study:
- To propose and evaluate an integrated ambiguity resolution strategy using combined GPS and BDS dual/triple-frequency observations.
- To enhance the performance of RTK positioning for medium baselines by leveraging multi-system and multi-frequency data.
- To investigate the benefits of integrating BDS triple-frequency signals with GPS observations for AR.
Main Methods:
- An integrated AR strategy was developed, starting with extra-wide-lane (EWL) ambiguities of BDS.
- Dual-frequency wide-lane (WL) ambiguities of BDS and GPS were resolved using a geometry-based model with fixed EWL observations.
- Basic ambiguities were estimated using an ionosphere-constrained model, incorporating fixed WL observations and a partial ambiguity fixing (PAF) strategy.
Main Results:
- Experiments with GPS/BDS dual/triple-frequency data over medium baselines (28.6–51.9 km) demonstrated improved AR model strength.
- The combined GPS/BDS system achieved a 75.7% average reduction in initialization time compared to the standalone BDS triple-frequency system.
- Enhanced AR performance led to more accurate and stable positioning results.
Conclusions:
- The integrated GPS/BDS dual/triple-frequency strategy significantly improves ambiguity resolution and reduces initialization time for medium baselines.
- Combining GPS and BDS observations offers superior performance over using BDS alone for high-precision navigation.
- The proposed method provides a robust approach for achieving reliable and precise RTK positioning.
Keywords:
GPS/BDSambiguity resolutiondual/triple-frequency observationsmedium baselinespartial ambiguity fixingMore Related Videos
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