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Reducing the Effect of Positioning Errors on Kinematic Raw Doppler (RD) Velocity Estimation Using BDS-2 Precise Point
Shunli Duan1, Wei Sun1, Chenhao Ouyang2
1School of Geomatics, Liaoning Technical University, Fuxin 123000, China.
Sensors (Basel, Switzerland)
|July 21, 2019
Summary
This study introduces a new method for estimating velocity using BeiDou Navigation Satellite System (BDS-2) precise point positioning (PPP) to overcome errors from traditional single point positioning (SPP). The BDS-2 PPP method significantly improves velocity estimation accuracy across various platforms.
Area of Science:
- Geomatics Engineering
- Satellite Navigation Systems
- Geodetic Surveying
Background:
- Traditional raw Doppler (RD) velocity estimation using Global Navigation Satellite System (GNSS) single point positioning (SPP) is limited by positioning errors.
- These errors, stemming from pseudorange inaccuracies, propagate to velocity estimation via the station-satellite unit cosine vector, reducing overall accuracy.
Purpose of the Study:
- To propose and validate a novel carrier-phase-based precise point positioning (PPP) method for BeiDou Navigation Satellite System (BDS-2) raw Doppler (RD) velocity estimation.
- To mitigate the impact of positioning errors inherent in traditional SPP methods on velocity accuracy.
- To demonstrate the enhanced performance of the BDS-2 PPP RD velocity estimation method across diverse dynamic platforms.
Main Methods:
- Developed a carrier-phase-based precise point positioning (PPP) approach for the second generation of the BeiDou Navigation Satellite System (BDS-2).
- Applied the BDS-2 PPP method to raw Doppler (RD) velocity estimation, contrasting its performance with traditional SPP RD methods.
- Conducted rigorous testing on vehicle-borne, ship-borne, and air-borne platforms to assess reliability and applicability.
Main Results:
- BDS-2 kinematic PPP positioning accuracy achieved decimeter-level, a significant improvement over the meter-level accuracy of SPP.
- Vehicle-borne tests showed BDS-2 PPP RD velocity accuracy improvements of 28.4% (east), 27.1% (north), and 26.1% (up) compared to SPP RD.
- Ship-borne and air-borne experiments demonstrated velocity accuracy enhancements of 17.4-38.1% for BDS-2 PPP RD over SPP RD in east, north, and up directions.
Conclusions:
- The proposed carrier-phase-based BDS-2 PPP RD velocity estimation method effectively eliminates positioning errors, leading to superior velocity accuracy.
- The method proves reliable and applicable across various dynamic platforms, including vehicles, ships, and aircraft.
- This advancement offers a more accurate solution for velocity estimation in GNSS-based applications.
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