Apparent clock variations of the Block IIF-1 (SVN62) GPS satellite

Montenbruck, Oliver; Hugentobler, Urs; Dach, Rolf; Steigenberger, Peter; Hauschild, André

doi:10.1007/s10291-011-0232-x

Cited by 165 publications

(116 citation statements)

References 12 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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“…Thus, the right side of the equation should contain aggregated weighted phase noise, constant factor including ambiguity term, hardware delay and inter-frequency biases The last parameter was recognised and investigated in GLONASS (due to satellite individual frequencies) and GPS signals. However, it was reported in [12,48] that for the latter system such data are affected by variations of inter-frequency bias, which have to be eliminated.…”

Section: Phase Measurement Noisementioning

confidence: 99%

On the Applicability of Galileo FOC Satellites with Incorrect Highly Eccentric Orbits: An Evaluation of Instantaneous Medium-Range Positioning

2018

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This study addresses the potential contribution of the first pair of Galileo FOC satellites sent into incorrect highly eccentric orbits for geodetic and surveying applications. We began with an analysis of the carrier to noise density ratio and the stochastic properties of GNSS measurements. The investigations revealed that the signal power of E14 & E18 satellites is higher than for regular Galileo satellites, what is related to their lower altitude over the experiment area. With regard to the noise of the observables, there are no significant differences between all Galileo satellites. Furthermore, the study confirmed that the precision of Galileo data is higher than that of GPS, especially in the case of code measurements. Next analysis considered selected domains of precise instantaneous medium-range positioning: ambiguity resolution and coordinate accuracy as well as observable residuals. On the basis of test solutions, with and without E14 & E18 data, we found that these satellites did not noticeably influence the ambiguity resolution process. The discrepancy in ambiguity success rate between test solutions did not exceed 2%. The differences between standard deviations of the fixed coordinates did not exceed 1 mm for horizontal components. The standard deviation of the L1/E1 phase residuals, corresponding to regular GPS and Galileo, and E14 & E18 satellite signals, was at a comparable level, in the range of 6.5-8.7 mm. The study revealed that the Galileo satellites with incorrect orbits were fully usable in most geodetic, surveying and many other post-processed applications and may be beneficial especially for positioning during obstructed visibility of satellites. This claim holds true when providing precise ephemeris of satellites.

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“…A key issue in triple-frequency PPP is to align the satellite clocks, namely IFCB consideration. The IFCB of GPS Block IIF satellites has been investigated by many researchers in terms of sources, dependence, periods, prediction, modeling, variations and amplitude limits [13,14,20,21]. The GPS multipath, which can be extracted using the ionospheric-free geometric linear combination, is a function of satellite elevation angle and antenna height, etc.…”

Section: Discussionmentioning

confidence: 99%

“…Actually, the triple-carrier combination time series show a comprehensive effect of the measurement noises, multipath as well as the time-varying portion of satellite phase hardware delay, namely IFCB. The satellite internal temperature variations due to varying sun illumination that depends on the relative geometry of the sun-spacecraft-earth may cause the variations of the satellite phase hardware delay, namely IFCB variations [14,20]. There is a negative correlation between the amplitude of single-day IFCB time series and the sun elevation above the satellite orbital plane.…”

Section: Data Acquisitionmentioning

confidence: 99%

Considering Inter-Frequency Clock Bias for BDS Triple-Frequency Precise Point Positioning

Pan

Zhang

et al. 2017

Remote Sensing

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Abstract:The joint use of multi-frequency signals brings new prospects for precise positioning and has become a trend in Global Navigation Satellite System (GNSS) development. However, a new type of inter-frequency clock bias (IFCB), namely the difference between satellite clocks computed with different ionospheric-free carrier phase combinations, was noticed. Consequently, the B1/B3 precise point positioning (PPP) cannot directly use the current B1/B2 clock products. Datasets from 35 globally distributed stations are employed to investigate the IFCB. For new generation BeiDou Navigation Satellite System (BDS) satellites, namely BDS-3 satellites, the IFCB between B1/B2a and B1/B3 satellite clocks, between B1/B2b and B1/B3 satellite clocks, between B1C/B2a and B1C/B3 satellite clocks, and between B1C/B2b and B1C/B3 satellite clocks is analyzed, and no significant IFCB variations can be observed. The IFCB between B1/B2 and B1/B3 satellite clocks for BDS-2 satellites varies with time, and the IFCB variations are generally confined to peak amplitudes of about 5 cm. The IFCB of BDS-2 satellites exhibits periodic signal, and the accuracy of prediction for IFCB, namely the root mean square (RMS) statistic of the difference between predicted and estimated IFCB values, is 1.2 cm. A triple-frequency PPP model with consideration of IFCB is developed. Compared with B1/B2-based PPP, the positioning accuracy of triple-frequency PPP with BDS-2 satellites can be improved by 12%, 25% and 10% in east, north and vertical directions, respectively.

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Apparent clock variations of the Block IIF-1 (SVN62) GPS satellite

Cited by 165 publications

References 12 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

On the Applicability of Galileo FOC Satellites with Incorrect Highly Eccentric Orbits: An Evaluation of Instantaneous Medium-Range Positioning

Considering Inter-Frequency Clock Bias for BDS Triple-Frequency Precise Point Positioning

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