Fast estimation and analysis of the inter-frequency clock bias for Block IIF satellites

Li, Haojun; Xiao-Hong, Zhou; Wu, Bin

doi:10.1007/s10291-012-0283-7

Cited by 49 publications

(21 citation statements)

References 10 publications

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“…Our point of departure is to model the code (phase) geometry-free observable short as a few hours (Li et al 2013;Montenbruck et al 2012). Such a consideration falls, however, outside the scope of the present paper.…”

Section: Retrieval Of Ionospheric Observablesmentioning

confidence: 98%

On the short-term temporal variations of GNSS receiver differential phase biases

Zhang

Teunissen

Yuan

2016

J Geod

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Abstract. As a first step towards studying the ionosphere with the Global Navigation Satellite System (GNSS), leveling the phase to the code geometry-free observations on an arc-by-arc basis yields the ionospheric observables, interpreted as a combination of slant total electron content along with satellite and receiver Differential Code Biases (DCB). The leveling errors in the ionospheric observables may arise during this procedure, which, according to previous studies by other researchers, are due to the combined effects of the code multipath and the intra-day variability in the receiver DCB. In this paper we further identify the short-term temporal variations of receiver Differential Phase Biases (DPB) as another possible cause of leveling errors. Our investigation starts by the development of a method to epoch-wise estimate Between-Receiver DPB (BR-DPB) employing (inter-receiver) single-differenced, phase-only 2GNSS observations collected from a pair of receivers creating a zero or short baseline. The key issue for this method is to get rid of the possible discontinuities in the epoch-wise BR-DPB estimates, occurring when satellite assigned as pivot changes. Our numerical tests, carried out using GPS (Global Positioning System, US GNSS) and BDS (BeiDou Navigation Satellite System, Chinese GNSS) observations sampled every 30 seconds by a dedicatedly selected set of zero and short baselines, suggest two major findings. First, epoch-wise BR-DPB estimates can exhibit remarkable variability over a rather short period of time (e.g. 6 centimeters over 3 hours), thus significant from a statistical point of view. Second, a dominant factor driving this variability is the changes of ambient temperature, instead of the un-modelled phase multipath.

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Section: Retrieval Of Ionospheric Observablesmentioning

confidence: 98%

On the short-term temporal variations of GNSS receiver differential phase biases

Zhang

Teunissen

Yuan

2016

J Geod

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“…With the availability of three-frequency signals for GPS Block IIF satellites, inter-frequency clock bias (IFCB) was found, which was defined as the difference of the satellite clock offsets determined from two different ionosphere-free (IF) linear combinations of L1/L2 and L1/L5 carrier phase observations, and could most likely be attributed to inconsistency among frequency-dependent phase biases within a satellite [24,25]. According to previous studies, the IFCB between the BDS-2 B1/B2 and B1/B3 ionosphere-free satellite clocks showed a peak-to-peak amplitude of about 4 cm and, more noticeably, 10-40 cm for GPS Block IIF satellites [26,27].…”

Section: Inter-frequency Clock Biasmentioning

confidence: 99%

Characterization of GNSS Signals Tracked by the iGMAS Network Considering Recent BDS-3 Satellites

et al. 2018

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The international GNSS monitoring and assessment system (iGMAS) tracking network has been established by China to track multi-GNSS satellites. A key feature of iGMAS stations is the capability to fully track new navigation signals from the recently deployed BDS-3 satellites. In addition to the B1I and B3I signals inherited from BDS-2 satellites, the BDS-3 satellites are capable of transmitting new open service signals, including B1C at 1575.42 MHz, B2a at 1176.45 MHz, and B2b at 1207.14 MHz. In this contribution, we present a comprehensive analysis and characterization of GNSS signals tracked by different receivers and antennas equipped in the iGMAS network, especially as they relate to BDS-3 signals. Signal characteristics are analyzed in terms of the carrier-to-noise density ratio for the different signals as measured by the receiver, as well as pseudo-range noise and multipath. Special attention is given to discussion of the satellite-induced code bias, which has been identified to exist in the code observations of BDS-2, and the inter-frequency clock bias (IFCB), which has been observed in the triple-frequency carrier phase combinations of GPS Block IIF and BDS-2 satellites. The results indicate that the satellite-induced code bias is negligible for all signals of BDS-3 satellites, while small IFCB variations with peak amplitudes of about 1 cm can be recognized in BDS-3 triple-carrier combinations.

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“…The key principle of the new approach is included in the IFCB estimation itself. As stated in Montenbruck et al (2012) and Li et al (2012; 2013b; 2013c) for the IFCB estimation, only triple-frequency phase observations are used so that the constant satellite hardware bias is absorbed by the ambiguity and is absent from the estimated IFCB. Therefore, if this IFCB product is used to compute the satellite clock offset for the triple-frequency user, the effect of the estimated clock products on the undifferenced positioning would be noticeable (Li et al, 2016a).…”

Section: Satellite Clock Offset Products and Observation Referencementioning

confidence: 99%

“…In this method, the phase observation is used to compute the variable part of the IFCB, while the code observation is used to compute the constant part of IFCB. For IFCB modelling, a combined linear and fourth harmonic function is used (Li et al, 2013b; 2013c; 2016b). This model is written as: where d is a constant; e is the coefficient of the linear terms; i is the order of the harmonics; T i is the period; θ i is an initial phase offset and λ i is the amplitude.…”

Section: Satellite Clock Offset Products and Observation Referencementioning

confidence: 99%

Service and Evaluation of the GPS Triple-Frequency Satellite Clock Offset

Zhu

Zhao³

et al. 2018

J. Navigation

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This paper considers the effect of the biases in Global Positioning System (GPS) observations on satellite clock offset estimation. GPS triple-frequency satellite clock and reference observations are discussed. When the reference observation is selected and the corresponding satellite clock offset is computed, satellite clock offsets for all observations are obtained based on the computed satellite clock offset and the biases between the reference observation and other observations. The characteristics of these biases are analysed, and a service strategy for the GPS triple-frequency satellite clock offset is presented. To evaluate the computed GPS satellite clock offset, the performance in single-point positioning is validated. The positioning results show that the average relative improvements are about 20%, 28% and 19% for north, east and vertical components, when the Differential Code Bias (DCB) (P1-P2), DCB (P1-P5) and modelled Inter-Frequency Clock Bias (IFCB) are corrected. The effect of DCB (P1-P2), DCB (P1-P5) and modelled IFCB on the altitude direction is more evident than on the horizontal directions.

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Fast estimation and analysis of the inter-frequency clock bias for Block IIF satellites

Cited by 49 publications

References 10 publications

On the short-term temporal variations of GNSS receiver differential phase biases

On the short-term temporal variations of GNSS receiver differential phase biases

Characterization of GNSS Signals Tracked by the iGMAS Network Considering Recent BDS-3 Satellites

Service and Evaluation of the GPS Triple-Frequency Satellite Clock Offset

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