philip moore jiasong wang school of civil engineering and geosciences university of newcastle upon...
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Philip Moore
Jiasong Wang
School of Civil Engineering and Geosciences
University of Newcastle upon Tyne
Newcastle upon Tyne
NE1 7RU
ENVISAT Orbit & RA2 CCVT in Newcastle University
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ENVISAT Precise Orbit Determination
Force ModelGravity model
3-body perturbation
Earth tides
Ocean tides
Atmospheric density
SRP + Albedo + Infrared
Relativity
Param (Dynamic)
Param (Reduced Dyn)
GRIM5-C1(120×120)
DEC403 JPL Eph
IERS96
GOT99
MSIS86
Macro/ESA; SRP factor = 1
Schwarzschild
6-hour drag+daily 1cpr along/cross track
6-hour drag+hourly 1cpr along/cross track
Sigma=5.E-9m/s/s
Correl. Time = 3 hours
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Altimeter Range model adopted
Model Source ENVISAT / ERS2
Total geocentric
ocean tide (1) + pole tide
Solid earth tide
Dry troposphere
Wet troposphere
Ionosphere
Inverse Barometer
Sea state bias
Orbit
GOT99: ENVISAT from GDR; model for ERS2
Model (from GDR): both satellites
Model (from GDR): both satellites
Model (from GDR): both satellites
GIM + scale from IRI95: both satellites
ENVISAT from GDR; inferred for ERS2
Model (from GDR): both satellites
From GDR or NCL POD
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0
1
2
3
4
5
6
7
c10-1
c10-2
c10-3A
c10-3B
c10-4
c10-5
c11-1A
c11-1B
c11-2
c11-3
c11-4A
c11-4B
c11-5
SLR(redu) DORI S(redu) SLR(dyn) DORI S(dyn)
RMS of SLR (cm) and DORIS RMS (0.1mm/s)
residuals in NCL POD
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0
0. 5
1
1. 5
2
2. 5
3
3. 5
c10-1
c10-2
c10-3A
c10-3B
c10-4
c10-5
c11-1A
c11-1B
c11-2
c11-3
c11-4A
c11-4B
c11-5
NCL-DEOS CNES-DEOS NCL-DEOS
RMS radial orbit difference (cm) for
ENVISAT cycles 10 and 11
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0
1
2
3
4
5
6
7
8
c10-1
c10-2
c10-3A
c10-3B
c10-4
c10-5
c11-1A
c11-1B
c11-2
c11-3
c11-4A
c11-4B
c11-5
NCL-DEOS CNES-DEOS NCL-CNES
RMS cross-track orbit difference (cm) for ENVISAT cycles 10 and 11
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Radial orbit difference between reduced dynamic and dynamic POD: RMS values over 4º long. by 2º lat. bins
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Radial orbit difference between DEOS and NCL (cyc10)
RMS values 4º long. by 2º lat. bins
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Radial orbit difference between DEOS and NCL (cyc11):
RMS values over 4º long. by 2º lat. bins
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Altimeter statistics
Flag Rejected
Cyc 10
Rejected
Cyc 11
1. Land 673042 667684
2. Shallow water
(reject if > -1000m)
311764 260787
3. SWH = 0 90339 78204
4. Tide (reject if > 20m) 936 1016
5. Peakiness (reject if
<1.5 or > 1.8)
75382 69038
Total rejected 1151463 1076729
Accepted 933856 945734
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RMS of crossover residuals cycles 10-11:
CNES v NCL reduced SLR+DORIS orbit
6
6. 5
7
7. 5
8
8. 5
c10-1
c10-2
c10-3A
c10-3B
c10-4
c10-5
c11-1A
c11-1B
c11-2
c11-3
c11-4A
c11-4B
c11-5
CNESReduDyn
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Sea State bias and altimeter time tag estimation from single crossovers
orbit 1 = CNES; orbit 2 = NCL (Reduced dynamic);
• Max time diff=5day, rejection criterion 20cm
Orbit Used/rejected RMS change t(ms) SSB: %SWH
1/Cyc 10
2/Cyc 10
6003/319
6030/292
9.46—7.25cm
9.23—6.94cm
0.01 ±0. 36
-0.01 ±0. 36
4.85 ± 1.03
4.83 ± 1.02
1/Cyc 11
2/Cyc 11
4791/582
5132/241
9.26—7.29cm
8.81—6.80cm
-0.17 ± 0.40
-0.20 ± 0.39
4.29 ± 1.08
4.16 ± 1.03
Note: SSB given as % of SWHConclusion: Results independent of orbit
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Sea State bias and altimeter time tag estimation from single crossover
Max time diff = 5day, NCL orbit applied, for Cyc 10 +11
Reject
level
Used/rejected RMS change t(ms) SSB: %SWH
60cm 11347/348 9.81—7.71cm -0.10 ± 0.26 4.62 ± 0.71
20cm 11154/540 9.03—6.87cm -0.09 ± 0.26 4.53 ± 0.73
Conclusion: Rejection level unimportant
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ENVISAT - ERS2 SSH: Ascending passes
Corrections applied: sea state bias and USO drift (ERS2) only
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ENVISAT - ERS2 SSH: Descending passesCorrections applied: sea state bias and USO drift (ERS2) only
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ENVISAT - ERS2 SSH: All passesAll Corrections applied:
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Note: All corrections applied:
descending pass mean = 118.1cm ;
ascending pass mean = 115.0cm
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Differences between ENVISAT (cyc 10) and ERS2 (cyc 78) solid Earth tide corrections: Note mean = -1.1cm
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Differences between ENVISAT (cyc 11) and ERS2 (cyc 79) solid Earth tide corrections: Note mean = -0.8cm
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Differences between ENVISAT (cyc 10) and ERS2 (cyc 78) total tidal corrections. Note mean = 1.4cm. Noise from total geocentric ocean tides, see next slide
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Differences between ENVISAT (cyc 10) and ERS2 (cyc 78) inverse barometer corrections: Note mean = -3.0cm
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Differences between ENVISAT (cyc 11) and ERS2 (cyc 79) inverse barometer corrections: Note mean = -2.8cm
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Differences between ENVISAT (cyc 10) and ERS2 (cyc 78)iono+wet+dry+inverse bar. corrections: Note mean = -3.1cm
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Differences between ENVISAT (cyc 10) and ERS2 (cyc 78) wet trop. Correction: Note mean = -0.4cm
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Differences between ENVISAT (cyc 10) and ERS2 (cyc 78)iono (GIM) corrections: Note mean = 0.14cm
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ENVISAT (cyc 10): mean = 1.237m
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ENVISAT (cyc 11): mean = 1.237m again!!
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Conclusions
• Orbits – agree to near 2cm RMS radially between analysis
centres– Reduced dynamic is better than dynamic OD
• Sea-state bias– Zero values (for very low wave heights??)– Assuming wave heights correct first look SSB
4.6% SWH – Non-parametric approximation not yet applied
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Conclusions
• Altimetry correction (Cyc10, 11)– inverse barometer correction has a bias of -3.0cm with
ERS2
– tide effect is different from ERS2 with mean=-1.4cm
• Crossover residuals – RMS about 7cm; shows benefit of DORIS tracking and
to a lesser extent dual frequency altimeter.
Great results c.f. 6.0cm for TOPEX/Poseidon
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•Sea surface height (SSH) difference with ERS2 (Cyc10, 11)
–With only SSB correction applied, bias=112cm
–With all corrections for both satellite , bias=117cm
–For Ascending pass and descending pass , 3cm difference for this relative bias calculation. Within error bars?
•SSH compared with mean sea surface (CLS01) (Cyc10)
– Bias=123.7cm (ENVISAT Cyc 10)
– Bias=5.4cm (ERS2 Cyc 078)
– relative bias = 118.3cm between two satellites
Conclusions
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