![Page 1: The RAMSES multi-pass interferometry campaign in X-band](https://reader030.vdocuments.us/reader030/viewer/2022012512/618bb8d335c9f807d80b5bf9/html5/thumbnails/1.jpg)
The RAMSES multi-pass interferometry campaign in X-band
FRINGE 2007Sébastien Angelliaume, Hélène Oriot, Xavier Dupuis
![Page 2: The RAMSES multi-pass interferometry campaign in X-band](https://reader030.vdocuments.us/reader030/viewer/2022012512/618bb8d335c9f807d80b5bf9/html5/thumbnails/2.jpg)
2
Outline of the presentation
• The campaign• RAMSES• Imaged Sites
• Processing• SAR processing• trajectory adjustment
• Temporal decorrelation and permanent scatterers in X band HR SAR imagery
• Oil storage tank filling
• Conclusion
![Page 3: The RAMSES multi-pass interferometry campaign in X-band](https://reader030.vdocuments.us/reader030/viewer/2022012512/618bb8d335c9f807d80b5bf9/html5/thumbnails/3.jpg)
3
The sensor
ONERA / RAMSES
* P, L, X, Ku : GMTI capabilityX, Ku, Ka : Interferometry capability
•Multi-band•Very high resolution•Polarimetric•Interferometric•Multi-channel
Band P*
0,43GHz
70MHz
V / H
V and H
L*
1,3GHz
200MHz
V / H
V and H
S
3,2GHz
300MHz
V / H
V and H
C
5,3GHz
300MHz
V / H
V and H
X*
9,6GHz
1200MHz
V / H
V and H
Ku*
14,3GHz
1200MHz
V / H
V and H
Ka*
35GHz
1200MHz
V or H
V and H
W
95GHz
500MHz
L or R
L and R
CenterFrequency
Bandwidth
TransmitPolarization
ReceivePolarization
![Page 4: The RAMSES multi-pass interferometry campaign in X-band](https://reader030.vdocuments.us/reader030/viewer/2022012512/618bb8d335c9f807d80b5bf9/html5/thumbnails/4.jpg)
4
Salon de Provence• Town• Flat, sloppy and montaneous area
Fos sur Mer• oil storage tank area
Puylaurent•mountaneaous area with a dam
Séchilienne•mountaneous area•landslide
The campaign (1/2)
from november 2005 to november 2006
![Page 5: The RAMSES multi-pass interferometry campaign in X-band](https://reader030.vdocuments.us/reader030/viewer/2022012512/618bb8d335c9f807d80b5bf9/html5/thumbnails/5.jpg)
5
The campaign (2/2)
X band
Resolution (HR & VHR) : 1 agility : 0.5m (264 MHz).2 agilities : 0.26m (504 MHz) on La Séchilienne
Incidence angles : 75, 60 and 40°.
Ping pong mode for instantaneous interferometry
Multi-pass airborne interferometry• Each flight composed of 4 to 6 passes with the same configuration• 3 flights with a one day to one week delay• Flights several months apart on Séchilienne
Challenges:• Altitude ambiguity monitoring
• flight precision : performant DGPS/INS on board
• Processing of HR interferograms with non linear trajectories
![Page 6: The RAMSES multi-pass interferometry campaign in X-band](https://reader030.vdocuments.us/reader030/viewer/2022012512/618bb8d335c9f807d80b5bf9/html5/thumbnails/6.jpg)
6
Fos sur Mer : instantaneous interferometry
Amplitude image
Interferogram : Ha ≈ 50m
![Page 7: The RAMSES multi-pass interferometry campaign in X-band](https://reader030.vdocuments.us/reader030/viewer/2022012512/618bb8d335c9f807d80b5bf9/html5/thumbnails/7.jpg)
7
Salon de Provence : instantaneousinterferometry
Amplitude image
interferogram: Ha ≈ 50m
![Page 8: The RAMSES multi-pass interferometry campaign in X-band](https://reader030.vdocuments.us/reader030/viewer/2022012512/618bb8d335c9f807d80b5bf9/html5/thumbnails/8.jpg)
8
Séchilienne : instantaneous interferometry
Amplitude image
Interferogram : Ha ≈ 50m
![Page 9: The RAMSES multi-pass interferometry campaign in X-band](https://reader030.vdocuments.us/reader030/viewer/2022012512/618bb8d335c9f807d80b5bf9/html5/thumbnails/9.jpg)
9
SAR Processing
• SAR processing with a common geometry (Pamela processor)• Focusing on DTED-2
Common geometry
P
Master trajectory
Slave trajectory
• Master and slave images processed so that thewavefronts on point P comingfrom M and S are tangencial
M
S
![Page 10: The RAMSES multi-pass interferometry campaign in X-band](https://reader030.vdocuments.us/reader030/viewer/2022012512/618bb8d335c9f807d80b5bf9/html5/thumbnails/10.jpg)
10
Results of the processing
![Page 11: The RAMSES multi-pass interferometry campaign in X-band](https://reader030.vdocuments.us/reader030/viewer/2022012512/618bb8d335c9f807d80b5bf9/html5/thumbnails/11.jpg)
11
Trajectory refinement
• modelling of the slave trajectory correction by a sum of cosinesfunctions
• Least square minimisation using the unwrapped interferogram
• Processing with the new slave trajectory
0 cm
10 cm
20 cm Example of trajectory refinement
![Page 12: The RAMSES multi-pass interferometry campaign in X-band](https://reader030.vdocuments.us/reader030/viewer/2022012512/618bb8d335c9f807d80b5bf9/html5/thumbnails/12.jpg)
Coherence analysis
![Page 13: The RAMSES multi-pass interferometry campaign in X-band](https://reader030.vdocuments.us/reader030/viewer/2022012512/618bb8d335c9f807d80b5bf9/html5/thumbnails/13.jpg)
13
Coherence false color representation
Amplitude image
0 (no coherent) 1 (coherent)
Interferometric coherence
False color representation
![Page 14: The RAMSES multi-pass interferometry campaign in X-band](https://reader030.vdocuments.us/reader030/viewer/2022012512/618bb8d335c9f807d80b5bf9/html5/thumbnails/14.jpg)
14
Coherent change detection : nature of the ground (1/4)
20 minutes 2 days
0 (no coherent) 1 (coherent)
Risk ofdecorrelation
![Page 15: The RAMSES multi-pass interferometry campaign in X-band](https://reader030.vdocuments.us/reader030/viewer/2022012512/618bb8d335c9f807d80b5bf9/html5/thumbnails/15.jpg)
15
Very High Resolution : Séchilienne area
Coherence :
simultaneous acquisition
Coherence :
Half an hour
Coherence :
10 months
![Page 16: The RAMSES multi-pass interferometry campaign in X-band](https://reader030.vdocuments.us/reader030/viewer/2022012512/618bb8d335c9f807d80b5bf9/html5/thumbnails/16.jpg)
16
Very High Resolution : Séchilienne area
![Page 17: The RAMSES multi-pass interferometry campaign in X-band](https://reader030.vdocuments.us/reader030/viewer/2022012512/618bb8d335c9f807d80b5bf9/html5/thumbnails/17.jpg)
17
Very High Resolution : Séchilienne area
Coherence representation interferometric representation
10 months between the 2 acquisitions, in X-band
Permanent scatterers visible on 25 cm resolution images
![Page 18: The RAMSES multi-pass interferometry campaign in X-band](https://reader030.vdocuments.us/reader030/viewer/2022012512/618bb8d335c9f807d80b5bf9/html5/thumbnails/18.jpg)
Oil storage area
![Page 19: The RAMSES multi-pass interferometry campaign in X-band](https://reader030.vdocuments.us/reader030/viewer/2022012512/618bb8d335c9f807d80b5bf9/html5/thumbnails/19.jpg)
19
Gas storage area
• Données amplitude
Simultaneousinterferogram : Ha ≈ 50 m
![Page 20: The RAMSES multi-pass interferometry campaign in X-band](https://reader030.vdocuments.us/reader030/viewer/2022012512/618bb8d335c9f807d80b5bf9/html5/thumbnails/20.jpg)
20
Gas storage area
Interferogram
1 hour
Ambiguity altitude
![Page 21: The RAMSES multi-pass interferometry campaign in X-band](https://reader030.vdocuments.us/reader030/viewer/2022012512/618bb8d335c9f807d80b5bf9/html5/thumbnails/21.jpg)
21
Residual interferogram
• Withdraw of oil storage altitude using the simultaneousinterferogram
• Phase variations are due to:• Residual altitude information due to the low ambiguity altitude of
the multi-pass interferogram• Misestimation of the trajectory• Atmospehric artefacts• Changes in the oil storage roofs
![Page 22: The RAMSES multi-pass interferometry campaign in X-band](https://reader030.vdocuments.us/reader030/viewer/2022012512/618bb8d335c9f807d80b5bf9/html5/thumbnails/22.jpg)
22
Oil storage area analysis
Radar illumination direction
Range direction
R1 R2
R3 R4
Computation of φA – φC :
Computation of φB – φC
Local measure insensitive to• trajectory mis-estimation
• Atmospheric propagation artefacts
A B C
![Page 23: The RAMSES multi-pass interferometry campaign in X-band](https://reader030.vdocuments.us/reader030/viewer/2022012512/618bb8d335c9f807d80b5bf9/html5/thumbnails/23.jpg)
23
Results
• Change detection on R2
• Consistent with ground truth• R2 was being emptied during the acquisition (roof displacement of
the order of 8cm)
• R1, R3 and R4 : no movement
10°2°166°31°Residual phase difference between top of the tank and floating roof
8°62°169°2.9°Residual phase difference between ground and floating roof
R4R3R2R1Tank #
![Page 24: The RAMSES multi-pass interferometry campaign in X-band](https://reader030.vdocuments.us/reader030/viewer/2022012512/618bb8d335c9f807d80b5bf9/html5/thumbnails/24.jpg)
24
Conclusion
• Very interesting campaign
• Not completely exploited
• Main results• Coherence analysis for several temporal intervals
• Change detection on oil storage field
• Work is on going to further analyze the oil storage field
• ONERA has developed a new sensor for civilian applications : SETHI
![Page 25: The RAMSES multi-pass interferometry campaign in X-band](https://reader030.vdocuments.us/reader030/viewer/2022012512/618bb8d335c9f807d80b5bf9/html5/thumbnails/25.jpg)
25
SETHI
![Page 26: The RAMSES multi-pass interferometry campaign in X-band](https://reader030.vdocuments.us/reader030/viewer/2022012512/618bb8d335c9f807d80b5bf9/html5/thumbnails/26.jpg)
Thank you for your attention …