Consistency of antenna products in the MGEX environment
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1 Consistency of antenna products in the MGEX environment A. Villiger 1, R. Dach 1, L. Prange 1, S. Schaer 12, A. Jäggi 1 1 Astronomical Institute, University of Bern, Bern, Switzerland 2 swisstopo, Wabern, Switzerland (arturo.villiger@aiub.unibe.ch) Slide 1 of 13
2 Outline Galileo IOV Pattern Evaluation of the IOV patterns GNSS inter-system translation biases comparison IOV orbit comparison Chamber calibrated receiver stations Availability from EPN Inter-system translation biases Conclusion Slide 2 of 13
3 Galileo IOV Pattern Officially disclosed by ESA (December 216) Chamber calibrated PCO and PCV for the 4 IOV satellites (SVN 11-14) 3 IOV satellites currently active (E11, E12, E19) Goal: Impact of the released patterns compared to the current IGS values (estimations) (based on MGEX solutions) Table: Ionosphere-free linear combination PCO (L1/L5) [m] SVN (PRN) E N U IGS (IOV) (E11) (E12) (E19) Slide 3 of 13
4 Galileo IOV Pattern Officially disclosed by ESA (December 216) Chamber calibrated PCO and PCV for the 4 IOV satellites (SVN 11-14) 3 IOV satellites currently active (E11, E12, E19) Goal: Impact of the released patterns compared to the current IGS values (estimations) (based on MGEX solutions) Table: Difference IOV-IGS PCO (IF: L1/L5) [m] SVN (PRN) E N U IGS (IOV) (E11) (E12) (E19) Slide 3 of 13
5 Galileo IOV Pattern Officially disclosed by ESA (December 216) Chamber calibrated PCO and PCV for the 4 IOV satellites (SVN 11-14) 3 IOV satellites currently active (E11, E12, E19) Goal: Impact of the released patterns compared to the current IGS values (estimations) (based on MGEX solutions) Slide 3 of 13
6 Evaluation of the IOV patterns Orbit comparison between IGS PCO and released IOV PCOs and PCVs Introducing station-wise inter-system translation biases (GTRA) One set for FOC and one set for IOV satellites Solutions based on MGEX (12 station) for doy 6 to 12 in 217 Slide 4 of 13 GPS/GAL GPS Figure: Used MGEX network for day 217-6
7 Evaluation of the IOV patterns Orbit comparison between IGS PCO and released IOV PCOs and PCVs Introducing station-wise inter-system translation biases (GTRA) One set for FOC and one set for IOV satellites Solutions based on MGEX (12 station) for doy 6 to 12 in Test scenarios: Description MGEX solution: IGS PCOs, no GTRAs Scenario 1: IGS PCOs, GTRAs Scenario 2: IOV PCO and PCV, no GTRAs Scenario 3: IOV PCO and PCV, GTRAs used for orbit comparison GTRAs comparison orbit comparison GTRAs comparison Slide 4 of 13
8 Inter-system translation biases (GTRA) Orbit-Solution (double-difference): Zero mean condition applied: translation and rotation PPP-Solutions: No constrains applied x x Slide 5 of 13 GPS z z GALILEO y y Station coordinates from GPS-only Station coordinates from GALILEO only Vector between GPS and GALILEO coordinates
9 Orbit comparison between IGS and IOV patterns Comparison between IGS and IOV pattern solutions for doy 6 in 217 [cm] Slide 6 of 13 Satellite E14: IGS vs IOV pattern [hour] Figure: PCO difference between solutions:.cm radial along-track out-of-plane
10 Orbit comparison between IGS and IOV patterns Comparison between IGS and IOV pattern solutions for doy 6 in 217 [cm] Slide 6 of 13 Satellite E12: IGS vs IOV pattern [hour] Figure: PCO difference between solutions: 2.6cm radial along-track out-of-plane
11 Orbit comparison between IGS and IOV patterns Comparison between IGS and IOV pattern solutions for doy 6 in 217 [cm] Slide 6 of 13 Satellite E11: IGS vs IOV pattern [hour] radial along-track out-of-plane Figure: PCO difference between solutions: 11.3cm
12 Orbit comparison between IGS and IOV patterns Comparison between IGS and IOV pattern solutions for doy 6 in 217 [cm] Slide 6 of 13 Satellite E19: IGS vs IOV pattern [hour] radial along-track out-of-plane Figure: PCO difference between solutions: 12.6cm
13 Midnight epoch overlaps Overlap between midnight epochs of one day arcs Comparison between MGEX solution and IOV pattern solution Midnight Overlaps for Galileo Overlaps [cm] [DOY] GAL E11 E12 E19 Figure: Midnight overlap of all Galileo satellites (using IGS PCOs) Slide 7 of 13
14 Midnight epoch overlaps Overlap between midnight epochs of one day arcs Comparison between MGEX solution and IOV pattern solution Midnight Overlaps for Galileo Overlaps [cm] [DOY] GAL E11 E12 E19 Figure: Midnight overlap of all Galileo satellites (using IOV PCOs and PCVs) Slide 7 of 13
15 Midnight epoch overlaps Overlap between midnight epochs of one day arcs Comparison between MGEX solution and IOV pattern solution Midnight Overlaps for Galileo Overlaps [cm] [DOY] GAL E11 E12 E19 Figure: Midnight overlap of all Galileo satellites: Difference IGS - IOV Slide 7 of 13
16 GNSS inter-system translation biases comparison 1 E [cm] N [cm] U [cm] Station Orbit: IGS Orbit: IOV Figure: Galileo IOV satellites, PCO/PCV: IGS Slide 8 of 13
17 GNSS inter-system translation biases comparison 1 E [cm] N [cm] U [cm] Station Orbit: IGS Orbit: IOV Figure: Galileo FOC satellites, PCO/PCV: IOV Slide 8 of 13
18 GNSS inter-system translation biases comparison 1 E [cm] N [cm] U [cm] Station Orbit: IGS Orbit: IOV Figure: Galileo IOV satellites, PCO/PCV: IGS Slide 8 of 13
19 GNSS inter-system translation biases comparison 1 E [cm] N [cm] U [cm] Station Orbit: IGS Orbit: IOV Figure: Galileo IOV satellites PCO/PCV: IOV Slide 8 of 13
20 GNSS inter-system translation biases comparison Table: Average inter-system bias for Galileo (except IOV) in cm Sol East North Up σ East σ North σ Up IGS IOV DIF [%] Table: Average inter-system bias for IOV satellites (E11,E12,E19) in cm Sol East North Up σ East σ North σ Up IGS IOV DIF [%] Slide 8 of 13
21 Chamber calibrated receiver stations Individual calibrated EUREF ANTEX file contains 12 chamber calibrated antennas with frequency L5 Impact of using L5 antenna pattern instead of L2 Estimation of Inter-System Translation Bias for Galileo and IOV satellites using either L1/L2 or L1/L5 pattern. Slide 9 of 13
22 Chamber calibrated antenna patterns Ionosphere-Free Linear Combination Galileo: IGS is using L1/L2 patterns (taken from GPS) No Galileo patterns available EUREF: 12 chamber calibrated antenna patterns available Difference of L1/L2 and L1/L5 PCOs between -1 and -1 mm STA Antenna type PCO (IF) L1 / L2 L1 / L5 PCO [mm] [mm] [mm] BRUX JAVRINGANT DM NONE POTS JAV RINGANT G3T NONE OBE4 JAV RINGANT G3T NONE NYA2 JAV RINGANT G3T NONE BADH LEIAR1 NONE WRLG LEIAR25.R3 LEIT DOUR LEIAR25.R3 NONE REYK LEIAR25.R4 LEIT HOFN LEIAR25.R4 LEIT NICO LEIAR25.R4 LEIT EUSK LEIAR25.R4 LEIT ISTA LEIAR25.R4 LEIT Slide 1 of 13
23 Chamber calibrated antenna patterns Ionosphere-Free Linear Combination Galileo: IGS is using L1/L2 patterns (taken from GPS) No Galileo patterns available EUREF: 12 chamber calibrated antenna patterns available Difference of L1/L2 and L1/L5 PCOs between -1 and -1 mm Slide 1 of 13
24 Inter-system translation biases: PPP 1 Inter System Translation Bias for station POTS: GAL E [cm] N [cm] U [cm] Slide 11 of [DOY] Orbit: IOV (L1/L2) Orbit: IOV (L1/L5) Figure: Galileo Inter-system translation bias: Station POTS
25 Inter-system translation biases STA Antenna type GTRA Used PCO and PCV: L1/L2 L1/L5 GTRA PCO [mm] [mm] [mm] [mm] BRUX JAVRINGANT DM NONE POTS JAV RINGANT G3T NONE OBE4 JAV RINGANT G3T NONE NYA2 JAV RINGANT G3T NONE BADH LEIAR1 NONE WRLG LEIAR25.R3 LEIT DOUR LEIAR25.R3 NONE REYK LEIAR25.R4 LEIT HOFN LEIAR25.R4 LEIT NICO LEIAR25.R4 LEIT EUSK LEIAR25.R4 LEIT ISTA LEIAR25.R4 LEIT Slide 12 of 13
26 Conclusion Galileo IOV Pattern tests: no orbit improvement or degradation improved IOV-translation bias repeatability with released pattern Recommendation to introduce IOV PCOs (and PCVs) within the MGEX community Test of chamber calibrated receiver antennas (EPN) L5 frequency PCO and PCV pattern are necessary (also for other frequencies) Slide 13 of 13
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