Effect of selection of combined observations on cycle-slip repair success rate for BDS triple-frequency signals

Yao, Yanjie; Wang, Shuang

doi:10.1016/j.asr.2020.03.013

Cited by 7 publications

(9 citation statements)

References 29 publications

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“…Since the BDS heterogeneous constellation includes Geosynchronous Earth Orbit (GEO) satellites, Inclined Geosynchronous Satellite Orbit (IGSO) satellites, and Middle Earth Orbit (MEO) satellites, using the same threshold for different types of satellites will result in missing or misjudging the number of anomaly satellite signals. It is recommended that the detection threshold could be selected between 0.01 and 0.02 m during moderate geomagnetic storms [ 32 , 33 , 34 , 35 , 36 ]. Then, we calculated the PAS index for all the BDS stations globally.…”

Section: Resultsmentioning

confidence: 99%

A Novel Ionospheric Disturbance Index to Evaluate the Global Effect on BeiDou Navigation Satellite System Signal Caused by the Moderate Geomagnetic Storm on May 12, 2021

Cong

Yue

et al. 2023

Sensors

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In this paper, we propose a new method to quantitatively evaluate the quality of the carrier phase observation signals of the BeiDou Navigation Satellite System (BDS) during weak and moderate geomagnetic storms. We take a moderate geomagnetic storm that occurred on 12 May 2021 during the 25th solar cycle as an example. The results show that the newly defined PAS (Percentage of Affected Satellites) index shows significant anomaly changes during the moderate geomagnetic storm. Its variation trend has good correlations with the geomagnetic storm Kp index and Dst index. The anomaly stations are mainly distributed in the equatorial region and auroral region in the northern and southern hemispheres. The proposed PAS index has a good indication for both BDS2 and BDS3 satellites. We further validated this index by calculating the Precise Point Position (PPP) positioning error. We found that the anomaly period of PAS has strong consistency with the abnormal period of PPP positioning accuracy. This study could provide methodological support for the evaluation of the signal quality and analysis of positioning accuracy for the BeiDou satellite navigation system under different space weather conditions.

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Section: Resultsmentioning

confidence: 99%

A Novel Ionospheric Disturbance Index to Evaluate the Global Effect on BeiDou Navigation Satellite System Signal Caused by the Moderate Geomagnetic Storm on May 12, 2021

Cong

Yue

et al. 2023

Sensors

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“…Therefore, they are selected as the optimal GF-phase combination coefficients for B1I/B3I/B2a and B1C/B3I/B2a signals to detect and repair cycle slips. Yao et al (2020) indicated that the form of two EWL combinations for 2EWL&1GF does not affect The MTIV value of GF-phase combinations within 100  cycles. Cycle slip repair success rate for 2EWL&1GF-phase combination based on BDS-3.…”

Section: Gf-phase Combinationsmentioning

confidence: 96%

“…This paper uses the Maximum Threshold of Ionospheric Variation (MTIV), (Yao et al, 2020) which demonstrates the four times STD of the residual ionosphere to evaluate the performance on the GF-phase combination detecting the insensitive cycle slip group ΔN 1 =ΔN 2 =ΔN 3 and analyze the detection effect of different GF-phase combinations. Table 3 displays the relevant parameters of the BDS-3 GF-phase combination within 5  cycles, and Figure 3 shows the MTIV value of the corresponding GF-phase combination within 100  cycles.…”

Section: Gf-phase Combinationsmentioning

confidence: 99%

“…Figure 4 The classic LAMBDA method is used to fix the cycle slip estimated value, and the reliability of the fixed cycle slip is judged by the Ratio test value. The corresponding covariance matrix of the cycle slip estimated value can be expressed as below (Yao et al, 2020):…”

Section: Optimal Linear Combinations Based On Bds-3 Observationsmentioning

confidence: 99%

“…In order to overcome the shortcomings of poor performance in detecting cycle slips under active ionospheric conditions, Cai et al (2013) studied the forward and backward moving window average (FBMWA) method and the second-order, time-difference phase ionospheric residual (STPIR) method which can availably detect cycle-slips under active ionospheric environment. Nevertheless, Yao and Wang (2020) pointed out that GF-IF and the STPIR method lose the ability to successfully detect insensitive cycle slip groups under high active ionospheric conditions. In addition, it is worth noting that Shi et al (2019) took the code observation error into account by adopting a posterior code residual check which was designed as a priority over the posterior phase residual check so that these cycle slips do not degrade positioning performance even if these cycle slips were not correctly detected in the pre-processing stage.…”

Section: Introductionmentioning

confidence: 99%

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Real-time cycle slip detection and repair for BDS-3 triple-frequency and quad-frequency B1C/B1I/B3I/B2a signals

Wang¹

2021

Acta Geodynamica Et Geomaterialia

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This paper presents a real-time cycle slip detection and repair strategy for the BDS-3 triplefrequency and quad-frequency phase observations. For the triple-frequency phase observations, two EWL code-phase combinations and one GF-phase combination are jointly employed to detect and repair cycle slips. Based on the different performances in the success of cycle slip detection and repair, this paper uses GF-phase combinations to detect and repair cycle slip individually. Specifically, the GF-phase combination with a large MTIV value is applied to detect cycle slip possessing the stronger ability to resist ionospheric delay. Besides, the GF-phase combination with a higher success rate of cycle slip repair is selected to repair cycle slip, and the classic LAMBDA method and Ratio test are implemented to fix the cycle slip solution and evaluate reliability separately. For the quad-frequency phase observations, we employ a supernumerary EWL combination based on the triple-frequency, which can directly determine the cycle slip value of the 4 th frequency. The results show that the cycle slip estimation value still can detect and repair all real and artificially added cycle slips even under harsh conditions. Moreover, the overall cycle slip repair success rate is greater than 99.99 %.

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Cycle slip detection and repair method towards multi-frequency BDS-3/INS tightly coupled integration in kinematic surveying

Xiao,

Zhu,

Zhang

et al. 2024

J Geod

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Carrier phase integer ambiguities must be determined for BDS-3/inertial navigation system (INS) tightly coupled (TC) integration to achieve centimetre-level positioning accuracy. However, cycle slip breaks the consistency of the integer ambiguities. Conventional multi-frequency cycle slip methods use the pseudorange; thus, requiring improvement when applied to kinematic situations. Furthermore, a concise and nonprior information-dependent model is crucial for real-time processing. In this study, an inertial-aided BDS-3 cycle slip detection and repair (I-CDR) method was developed. First, a BDS-3/INS TC model with I-CDR was created. The ionospheric delays were modelled as part of the TC states; therefore, they could be estimated and eliminated. Investigations were conducted on the effects of carrier phase noise, residual ionosphere delay, and INS-predicted position error on combined cycle slip detection (CCD) accuracy. The optimal CCDs under various frequency available configurations were determined. The effectiveness of I-CDR was demonstrated using land vehicle test data. The false alarm ratio was less than 1.0%, and the missed detection ratio was almost zero even in situations with challenging abundant 1-cycle slips in random epochs. Furthermore, the right determination ratio reached 100%. In addition, BDS-3 signal loss-recovery cases were simulated, and all cycle slips for all satellites could be repaired within 40s. I-CDR exhibits outstanding cycle slip detection and repair performance for dense 1-cycle slip and signal loss-recovery cases, demonstrating its suitability for BDS-3/INS TC integration.

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Effect of selection of combined observations on cycle-slip repair success rate for BDS triple-frequency signals

Cited by 7 publications

References 29 publications

A Novel Ionospheric Disturbance Index to Evaluate the Global Effect on BeiDou Navigation Satellite System Signal Caused by the Moderate Geomagnetic Storm on May 12, 2021

A Novel Ionospheric Disturbance Index to Evaluate the Global Effect on BeiDou Navigation Satellite System Signal Caused by the Moderate Geomagnetic Storm on May 12, 2021

Real-time cycle slip detection and repair for BDS-3 triple-frequency and quad-frequency B1C/B1I/B3I/B2a signals

Cycle slip detection and repair method towards multi-frequency BDS-3/INS tightly coupled integration in kinematic surveying

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