A priori solar radiation pressure model for QZSS Michibiki satellite
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1 IGS Workshop, 8-12 Feb, 2016, Sydney, Australia A priori solar radiation pressure model for QZSS Michibiki satellite Qile Zhao, Guo Chen, Jing Guo, Jingnan Liu ( zhaoql@whu.edu.cn) GNSS Research Center, Wuhan University
2 Quasi-Zenith Satellite System (QZSS) Japanese regional augmentation system for GPS in the Asia-Pacific region Launch of QZS-1 in September 2010, PRN J01, Michibiki Inclined Geosynchronous Orbit (IGSO) Attitude control mode: Yaw-steering (YS) and Orbit-Normal (ON) mode
3 QZSS orbit: SLR residuals QZF SLR residuals show clear β-angle dependent systematic errors when satellite is in YS mode TUM SLR residuals show different pattern related to SRP model used when satellite is in ON mode Steigenberger P, Kogue S (2014) IGS-MGEX: QZSS orbit and clock determination
4 QZSS orbit: comparison (QZF vs TUM) "bow-tie" pattern in radial during ON model linear correlation with β-angle in cross-track better consistency since 2014 The deficiency of SRP model for POD in ON mode! Steigenberger P, Kogue S (2014) IGS-MGEX: QZSS orbit and clock determination
5 CODE SRP models a = a0 + D( u) e + Y( u) e + B( u) e emp D Y B n D i= 1 n i= 1 n i= 1 D D { ic, i is, i } Du ( ) = D + D cosc u+ D sin S u Y Y Y { ic, i is, i } Yu ( ) = Y+ Y coscu+ Y sin Su B B B { ic, i is, i } Bu ( ) = B + B coscu+ B sin S u Reference n D n Y n B Periodic terms (Beutler et al 1994) (Springer et al 1999) C D, S D = i; C Y, S Y = i; C B, S B = i i i i i i i (Arnold et al 2015) 2i 0 2i-1 D D B B C, S = 2 i; C, S = 2i 1 i i i i
6 Adjustable box-wing model Modelded the satellite as "a box and two wings" (Rodríguez-Solano et al 2012) The similar POD accuracy has been achieved as CODE by adjustment of the optical coefficients of satellite bus and solar panels, and other parameters
7 Comparison of different SRP models Solutions SRP model Parameters to be estimated C5 C5a D4B1 ABW CODE model without a priori model (Beulter et al 1994) CODE model without a priori model but with an empirical constant acceleration bias in along-track (Guo et al 2015) Extended CODE model ( Arnold et al 2015) Adjustable Box-wing model (Rodríguez-Solano et al 2012) D0, Y0, B0, Bc1, Bs1 D0, Y0, B0, Bc1, Bs1, A0 D0, Y0, B0, Dc2, Ds2, Dc4, Ds4, Bc1, Bs1 SP, SB, Y0, +XAD, +ZAD, -ZAD, +XR, +ZR, -ZR
8 Overlapping orbit β-angle dependent systematic errors in along-track and cross-track direction for C5 solution in YS mode Clear β -angle dependent systematic errors in along-track and radial direction for all solutions in ON mode Different behaviors are shown in cross-track when the Sun cross the orbit plane
9 SLR residuals C5 C5a No clear β-angle dependent systematic error in ABW solution, but this error is exist for others. However, lower performance for ABW solution in ON mode D4B1 ABW
10 QZSS Michibiki vs Galileo Cuboid, stretch in Z axis L-band antenna Cuboid, stretch in X axis Cuboid box model? Montenbruck et al (2015)
11 Enhanced SRP model for Galileo Montenbruck et al (2015) Deduced for box-wing shape in yaw-steering regime Without considering the acceleration in solar panels a a a αδ 2 ρ 2 3 aa ( cosε + cosε cos ε) 2 ac( cosε cos ε + sin ε) 3 ρ 2 a ( cosε cos ε sin ε) 2a cos ε αδ αδ 2 D = C ( cosε + sin ε + ) S ( cosε sin ε sin ε + ) 4 αδ 2 αδ ab = as (cosεsin ε) aa ( cosε sin ε) 3 3 ρ ρ 2 a (( cosε sin ε) cosεsin ε) 2 a (( cosε + sin ε) cosεsin ε) C S ρ 2 2aA cos εsin 2 3 ρ 3 A ε S
12 A prior SRP model for QZSS Michibiki The acceleration reconstruction in D and B axis Fitting Coefficie the coefficients in D above (nm/s 2 ) equations with B reconstructed (nm/s 2 ) acceleration nts YS ON YS ON a αδ C a αδ S a αδ A a ρ C a ρ S a ρ A The accelerations in solar panels cause the different values for that same coefficients in D and B.
13 Improvement of the prior model in ON mode C5 without priori model C5 with priori model Periodic variations for Bc, Bs, and B0; Linear variations for Y0
14 Improvement of the prior model in ON mode a = a + a ON fit D D D0 a = a + a + a cos( u) + a sin( u) a ON fit fit fit B B B0 Bc1 Bs1 ON Y = a fit Y0 2 a = c + d β + e β fit * * * * Coefficients fit ad 0 fit ab 0 fit abc 1 fit abs 1 fit ay 0 c * d * e * Fitting the parameters during ON season with a two-order polynomial against beta angle
15 The variations of CODE SRP parameters C5 with priori model C5 with improved priori model
16 Validation: overlapping orbit 4.04cm 11.02cm 16.71cm
17 Validation: SLR residuals SLR biases when the Sun is cross the orbit plane from the below to the above Solutio n C5 Year YS ON Mean STD RMS Mean STD RMS Enhanc ed SRP for QZSS C5 without 2015 priori model C5 with 1.88 enhanced priori model 14.23
18 Conclusion For QZSS Michibiki, there is β-angle dependent systematic error, and the CODE and its extend SRP models are hard to eliminate the error Furthermore, CODE SRP and its modified version has deficiency for modelling the SRP acting on satellite in ON mode With reconstructed acceleration, a priori SRP model has been established for QZSS Michibiki satellite The model is consists two parts for YS and ON mode, respectively With this model, the systematic errors in SLR residuals has been removed, and orbit accuracy has been improved significantly when satellite in ON mode However, there is still relative larger SLR biases when the Sun is cross the orbit plane from the below to the above. It needs further investigation.
19 Thanks for your attention! Any question or advice will be appreciated!
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