A Cycle Slip Repair Method Against Ionospheric Effects and Observational Noises for BDS Triple-Frequency
Dehai Li1, Jinzhong Mi1, Pengfei Cheng1
1Chinese Academy of Surveying and Mapping, No.28, Lianhuachi West Road, Beijing 100830, China.
Sensors (Basel, Switzerland)
|May 21, 2020
Summary
A new BeiDou navigation satellite system (BDS) triple-frequency cycle slip repair (CSR) method (BTCSR) effectively mitigates ionospheric delay and observational noise. BTCSR achieves a 99.9927% success rate, outperforming existing methods in challenging conditions.
Area of Science:
- Satellite Navigation Systems
- Geodesy and Geophysics
- Signal Processing
Background:
- Cycle slip detection (CSD) and repair (CSR) are crucial for precise satellite navigation, but are often compromised by ionospheric delays and observational noise.
- Existing methods like classic triple-frequency CSR (CTCSR), geometry-free cycle slip detection (GFCSD), and Melbourne-Wubbena cycle slip combination detection (MWCSD) have limitations in handling severe ionospheric variations and pseudorange errors.
Purpose of the Study:
- To introduce a novel BeiDou navigation satellite system (BDS) triple-frequency CSR method (BTCSR) designed to overcome the limitations of existing techniques.
- To enhance the accuracy and reliability of cycle slip repair in the presence of ionospheric disturbances and observational noise.
Main Methods:
- Developed BTCSR by building upon CTCSR, incorporating optimized combinations of phases and pseudoranges for ionospheric delay correction and noise reduction.
- Introduced an optimal model for calculating cycle slip combinations, prioritizing the minimization of residual ionospheric error effects.
- Integrated a discriminant function utilizing epoch-difference values of ionosphere-free and geometry-free phases to ensure CSR correctness and mitigate pseudorange error interference.
Main Results:
- BTCSR achieved a CSR success rate of 99.9927% with root mean squared errors of (0.0646, 0.1261, 0.1069) cycles.
- BTCSR demonstrated superior performance over CTCSR, GFCSD, and MWCSD when subjected to simulated 1.5m pseudorange errors and during a moderate magnetic storm (level 6).
- BTCSR successfully repaired challenging cycle slips, including (0,59,62) and (1,1,1) on B1, B2, B3 frequencies, which proved difficult for GFCSD and MWCSD.
Conclusions:
- BTCSR provides reliable cycle slip repair results even under significant pseudorange errors and severe ionospheric variations.
- The proposed method offers a robust solution for improving the accuracy of BeiDou navigation data processing.
- A cut-off elevation greater than 10 degrees is recommended for optimal BTCSR performance.
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