Latest improvements in CODE's IGS MGEX solution
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1 Latest improvements in CODE's IGS MGEX solution L. Prange, R. Dach, G. Beutler, D. Sidorov, A. Villiger, S. Schaer, A. Jäggi Astronomical Institute, University of Bern, Switzerland Federal office of topography swisstopo, Wabern, Switzerland IGS Workshop, 3-7 July 2017, Paris, France
2 Contents Current status of the CODE MGEX solution Planned model changes Importance of satellite meta data Empirical SRP model for ON Summary and outlook
3 Focus of MGEX-related activity since last IGS WS Survey of preliminary state: Publication in JoG (doi /s ) Operations and related tasks: Adaptation to long RINEX3 file names Switch to default antenna model (Steigenberger et al., 2016) Switch to IGS14 Upgrade of operational status: Full integration into CODE IGS routine (software, configuration, merge of data bases) Reaction to MGEX status change at IGS WS 2016 Better coordination of parallel developments
4 COM clock validation 2016: daily linear fit (Median and IQR; satellites in eclipse or normal mode are not considered) Galileo PHM, QZS-1, most GPS IIR and IIF: excellent clocks (even suited for orbit validation) Some GPS IIF, GLONASS, Galileo RAFS: worse (RMS: 0.5 ns or bigger) BeiDou: mixed performance
5 COM orbit validation 2016: SLR residuals (Median and IQR; satellites in eclipse or normal mode are not considered) Significant SLR offsets for Galileo and QZSS due to orbit model deficiencies with impact on radial orbit component (respectively scale) Model improvements are needed (e.g., ANTEX, albedo, antenna thrust)
6 Galileo: Planned model changes Improvements of orbit model planned in the near future: QZSS: Activation of albedo and antenna thrust Activation of IOV attitude model for all Galileo SC Activation of pulses (every 12h in R,S,W) IOV Antenna model (=> impact analysis: #6) Activation of albedo and antenna thrust ( guessed box-wing model (own or external, e.g., Montenbruck et al. (2017)) Later: Activation of ON attitude and suited SRP model BDS: Later: Activation of ON attitude and suited SRP model
7 Importance of satellite meta data Missing satellite meta data is a limiting factor for accuracy of estimated orbits and clocks Publication of Galileo IOV satellite meta data by the GSA in Dec is a step towards the right direction Missing/unsure information: we can try to make a good guess (like previously done, e.g., for GLONASS antenna thrust; is this tolerable?)
8 Importance of satellite meta data Available/assumed information: Galileo: QZSS: Disclosed IOV meta data (satellite mass, size, and surface properties) => sufficient for simple box-wing model Disclosed IOV attitude model Assuming same models for FOC might not be correct, but better than nothing Measured antenna transmit power for IOV and FOC presented by Steigenberger et al. at EGU 2017 Very coarse info about satellite size provided (e.g., on MGEX website); assumption on surface properties (e.g., similar to IOV) => rough guess on simple box-wing model Wide range of possible SC masses is provided on the IGS- MGEX website ( kg) Transmission power provided by Kogure et al. in: Springer Handbook of Global Navigation Satellite Systems (2017)
9 Importance of satellite meta data Test Galileo QZSS Name Ant. Thr. Albedo Attitude Pulses Median SLR [cm] Albedo Ant. Thr. (244 W) Median SLR [cm] OPER ALB1 x m= 1800 kg AAT1 x 260 W m= 1800 kg AAT2 x 130 W m= 3600 kg EAT x 200 W x m= 1950 kg EATPA x 200 W x R, S, W; 12h +0.6 m= 1950 kg m= 1800 kg m= 3600 kg m= 1950 kg m= 1950 kg
10 Importance of satellite meta data Test Galileo QZSS Name Ant. Thr. Albedo Attitude Pulses Median SLR [cm] Albedo Ant. Thr. (244 W) Median SLR [cm] OPER Impact albedo: +1.8 cm ALB1 x m= 1800 kg AAT1 x 260 W m= m= Impact antenna thrust: 1800 Impact kg SC 1800 mass: kg AAT2 x 130 W - 1 cm/100 - W -0.7 m= 2.2 cm/1000 m= kg 3600 kg 3600 kg EAT x 200 W x m= 1950 kg EATPA x 200 W x R, S, W; 12h +0.6 m= 1950 kg m= 1950 kg m= 1950 kg
11 Importance of satellite meta data FOC1 IOV Consideration of albedo and antenna thrust reduces SLR offset Uncertainties remain: Satellite macro model is rough (IOV) or guessed (FOC, QZSS) True satellite mass and CoM unknown (QZSS) Uncertainties w.r.t. transmit power Antenna calibration also impacts orbit scale
12 Expected impact of model changes IOV attitude model (OPER vs. EAT): minimal impact Pulses in R, S, W (EATPA): IQR drops cm (expected future configuration) Orbit errors remain increased during eclipses (why?)
13 Tests with QZS-1 and BDS POD Orbit normal mode (ON) Simulating and testing empirical SRP models using different decompositions and parameterizations (ECOM-N v ) QZS-1 with ECOM2 Classical ECOM SRP models are not suited for ON QZS-1 with ECOM-N v2 New SRP models: improvement for shorter arcs
14 Orbit normal mode (ON) Size of some new SRP parameters is a function of the Beta angle YA ECOM2 NA ECOM-N v1 NA ECOM-N v2 0 Estimated SRP coefficient of QZS-1 QZS-1 with ECOM-N v4 QZS-1: consideration of Beta: improvement also for long arcs Simulated SRP coefficient of QZS-1 C11 with ECOM-N v2 BDS: simple (no Beta-dependency) SRP model sufficient
15 COM to-do list Implementation of Galileo, QZSS, BeiDou (except GEOs) Use of RINEX3 files from IGS and EPN now also with long file names; selection of observation types Improved SRP model for yaw-steering attitude (ECOM2, Arnold et al., 2015) Proper handling of observation biases; BIAS-SINEX Attitude laws for GPS, GLONASS, Galileo eclipses Tuning of ambiguity resolution for Galileo, BeiDou, QZSS Albedo radiation modelling for Galileo, QZSS, BeiDou Antenna thrust for (GLONASS), Galileo, QZSS, BeiDou Normal attitude and related SRP models for QZSS and BeiDou ANTEX (PCO+PCV) for Galileo, QZSS, BeiDou
16 COM to-do list Implementation of Galileo, QZSS, BeiDou (except GEOs) Use of RINEX3 files from IGS and EPN now also with long file names; selection of observation types Improved SRP model for yaw-steering attitude (ECOM2, Arnold et al., 2015) See clock- and bias-related presentations by Schaer (plenary #3) Proper handling of observation biases; BIAS-SINEX and Villiger (plenary #6) Attitude laws for GPS, GLONASS, Galileo eclipses Tuning see bias-related of ambiguity presentation resolution for by Galileo, Schaer BeiDou, (plenary QZSS #3) Albedo radiation modelling for Galileo, QZSS, BeiDou Antenna thrust for (GLONASS), Galileo, QZSS, BeiDou Normal attitude and related SRP models for QZSS and BeiDou ANTEX See ANTEX-related (PCO+PCV) for presentation Galileo, QZSS, by Villiger BeiDou (plenary #3)
17 Thank you for your interest!
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