BeiDou Time Transfer With the Standard CGGTTS

Huang, Wei; Defraigne, Pascale

doi:10.1109/tuffc.2016.2517818

Cited by 35 publications

(24 citation statements)

References 13 publications

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“…By using the constructed ionosphere-free observation P 3 , we remove the first-order ionospheric effect, which contributes to more than 99% of the entire ionospheric effects (Defraigne and Baire, 2010;Harmegnies et al, 2013;Huang and Defraigne, 2016), and the residual errors of higher-order terms are about 2∼4 cm (Bassiri and Hajj, 1993;Deng et al, 2015;Morton et al, 2009).…”

Section: Ionospheric Effectmentioning

confidence: 99%

Preliminary experimental results of determining the geopotential difference between two synchronized portable hydrogen clocks at different locations

Shen,

Wu,

Sun

et al. 2020

Preprint

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According to general relativity theory (GRT), by comparing time elapses between two precise clocks located at two different stations, the gravity potential (geopotential) difference between them can be determined, due to the fact that precise clocks at positions with different geopotentials run at different rates. Here, we provide preliminary experimental results of the geopotential determination based on time elapse comparisons between two remote atomic clocks located at Beijing and Wuhan, respectively. After synchronizing two hydrogen atomic clocks at Beijing 203 Institute Laboratory (BIL) for 20 days as zero-baseline calibration, namely synchronization, we transport one clock to Luojiashan Time-Frequency Station (LTS), Wuhan, without stopping its running. Continuous comparisons between the two remote clocks were conducted for 65 days based on the Common View Satellite Time Transfer (CVSTT) technique. The ensemble empirical mode decomposition (EEMD) technique is applied to removing the uninteresting periodic signals contaminated in the original CVSTT observations to obtain the residual clocks-offsets series, from which the time elapse between the two remote clocks was determined. Based on the accumulated time elapse between these two clocks the geopotential difference between these two stations was determined. Given the orthometric height (OH) of BIL, the OH of the LTS was determined based on the determined geopotential difference. Comparisons show that the OH of the LTS determined by time elapse comparisons deviates from that determined by Earth gravity model EGM2008 by about 98 m. The results are consistent with the frequency stabilities of the hydrogen atomic clocks (at the level of 10 −15 /day) applied in our experiments.

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Section: Ionospheric Effectmentioning

confidence: 99%

Preliminary experimental results of determining the geopotential difference between two synchronized portable hydrogen clocks at different locations

Shen,

Wu,

Sun

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…With high-precision and high-reliability DCB and DPB, PPP and RTK, as well as PPP-RTK can reach even higher levels (Gao et al 2017b;Odolinski and Teunissen 2017a;Psychas et al 2019). Moreover, accurate calibration of DCB and DPB is an important prerequisite for time and frequency transfer based on GNSS (Defraigne and Baire 2011;Huang and Defraigne 2016).…”

Section: Introductionmentioning

confidence: 99%

Characteristics of receiver-related biases between BDS-3 and BDS-2 for five frequencies including inter-system biases, differential code biases, and differential phase biases

Sheng

El‐Mowafy

et al. 2021

GPS Solut

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It is foreseeable that the BeiDou navigation satellite system with global coverage (BDS-3) and the BeiDou navigation satellite (regional) system (BDS-2) will coexist in the next decade. Care should be taken to minimize the adverse impact of the receiver-related biases, including inter-system biases (ISBs), differential code biases (DCB), and differential phase biases (DPB) on the positioning, navigation, and timing (PNT) provided by global navigation satellite systems (GNSS). Therefore, it is important to ascertain the intrinsic characteristics of receiver-related biases, especially in the context of the combination of BDS-3 and BDS-2, which have some differences in their signal level. We present a method that enables time-wise retrieval of between-receiver ISBs, DCB, and DPB from multi-frequency multi-GNSS observations. With this method, the time-wise estimates of the receiver-related biases between BDS-3 and BDS-2 are determined using all five frequencies available in different receiver pairs. Three major findings are suggested based on our test results. First, code ISBs are significant on the two overlapping frequencies B1II and B2b/B2I between BDS-3 and BDS-2 for a baseline with non-identical receiver pairs, which disrupts the compatibility of the two constellations. Second, epoch-wise DCB estimates of the same type in BDS-3 and BDS-2 can show noticeable differences. Thus, it is unreasonable to treat them as one constellation in PNT applications. Third, the DPB of BDS-3 and BDS-2 may have significant short-term variations, which can be attributed to, on the one hand, receivers composing baselines, and on the other hand, frequencies.

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“…Martínez-Belda et al investigated new analysis procedures based on the E5 code plus-carrier (CPC) combination for time transfer [8,9]. Huang and Defraigne extended the standard Common GNSS Generic Time Transfer Standard (CGGTTS) software tool to the BDS regional system (BDS2) [10]. Liang et al participated in the experiment of BDS2 time transfer in coordinated universal time (UTC), of which the stability and accuracy were evaluated by using common clock difference and multiple inter-continental baselines [11].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Multi-GNSS Time and Frequency Transfer Performance Using Overlap-Frequency Observations

Zhang

Gao

et al. 2021

Remote Sensing

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The modernized GPS, Galileo, and BeiDou global navigation satellite system (BDS3) offers new potential for time transfer using overlap-frequency (L1/E1/B1, L5/E5a/B2a) observations. To assess the performance of time and frequency transfer with overlap-frequency observations for GPS, Galileo, and BDS3, the mathematical models of single- and dual-frequency using the carrier-phase (CP) technique are discussed and presented. For the single-frequency CP model, the three-day average RMS values of the L5/E5a/B2a clock difference series were 0.218 ns for Galileo and 0.263 ns for BDS3, of which the improvements were 36.2% for Galileo and 43.9% for BDS3 when compared with the L1/E1/B1 solution at BRUX–PTBB. For the hydrogen–cesium time link BRUX–KIRU, the RMS values of the L5/E5a/B2a solution were 0.490 ns for Galileo and 0.608 ns for BDS3, improving Galileo by 6.4% and BDS3 by 12.5% when compared with the L1/E1/B1 solution. For the dual-frequency CP model, the average stability values of the L5/E5a/B2a solution at the BRUX–PTBB time link were 3.54∙× 10−12 for GPS, 2.20 × 10−12 for Galileo, and 2.69 × 10−12 for BDS3, of which the improvements were 21.0%, 45.1%, and 52.3%, respectively, when compared with the L1/E1/B1 solution. For the BRUX–KIRU time link, the improvements were 4.2%, 30.5%, and 36.1%, respectively.

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BeiDou Time Transfer With the Standard CGGTTS

Cited by 35 publications

References 13 publications

Preliminary experimental results of determining the geopotential difference between two synchronized portable hydrogen clocks at different locations

Preliminary experimental results of determining the geopotential difference between two synchronized portable hydrogen clocks at different locations

Characteristics of receiver-related biases between BDS-3 and BDS-2 for five frequencies including inter-system biases, differential code biases, and differential phase biases

Comparison of Multi-GNSS Time and Frequency Transfer Performance Using Overlap-Frequency Observations

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