Transcript No Slide Title

ASAR Validation Review
AP and GM Level 0 Product Quality
Birgit Schättler
Remote Sensing Technology Institute
German Aerospace Center (DLR)
ENVISAT Validation Workshop - ESRIN – 9-13 December 2002
Page 1
Overview
Objectives and Approach
Downlink Data Quality
Echo Data Statistics
Detailed Analysis of an AP Level 0 Product
Detailed Analysis of a GM Level 0 Product
Summary and Conclusions
ENVISAT Validation Workshop - ESRIN – 9-13 December 2002
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Objectives
•
ensure, that ASAR AP and GM level 0 products do not
show systematic deficiencies
•
start the quantitative analysis of raw data parameters
like echo data statistics, noise measurements, …
ENVISAT Validation Workshop - ESRIN – 9-13 December 2002
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Approach
•
Evaluate systematically and automatically level 1B
product annotation parameters related to level 0
product quality (e.g. downlink data quality, echo data
statistics, noise measurements ) using a tool
incorporated into the PDS
functionality not yet available => only restricted systematic
analysis possibilities based on CBTS (“Chris Buck Tool Set”)
•
Perform a detailed analysis of selected level 0
products using SARCON, an off-line SAR product
quality analysis software
ENVISAT Validation Workshop - ESRIN – 9-13 December 2002
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AP Systematic Analysis
AP systematic analysis based on annotations of 106
products only : 57 APM, 49 APP
18 IS 1 :
24 IS 2 :
8 IS 3 :
22 IS 4 :
16 IS 5 :
8 IS 6 :
10 IS 7 :
1 VH
3 HH
2 VH
2 VH
2 VH
4 HH
8 VV VH
13 VV VH
6 VV VH
8 VV VH
6 VV VH
5 VV VH
9 HV HH,
5 HV HH
3 VV VH
7 HV HH
3 VV HH
8 HV HH
8 HV HH
3 HV HH
ENVISAT Validation Workshop - ESRIN – 9-13 December 2002
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AP Downlink Data Quality Summary
•
missing range lines detected in 3 products:
1 with 7 missing, 2 with 1 missing each
•
product with 7 missing range lines has 2 corrupted
auxiliary codes, all other products show no auxiliary
code error at all
•
missing lines percentage = 0.00014 %
(9 missing out of 6392012)

Good downlink data quality can be assumed
ENVISAT Validation Workshop - ESRIN – 9-13 December 2002
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I and Q Channel Bias
IS 1 - I Channel Bias
0.0022
0.0022
0.0021
0.0021
0.0019
0.0018
VV from VV_VH
0.002
VH from VV_VH
0.0019
HV from HV_HH
0.0017
bias
0.002
bias
IS 1 - Q Channel Bias
VH from VV_VH
0.0018
HV from HV_HH
0.0017
HH from HV_HH
0.0016
VV from VV_VH
HH from HV_HH
0.0016
0.0015
0.0015
0.0014
0.0014
0 1 2 3 4 5 6 7 8 9 101112131415161718
0 1 2 3 4 5 6 7 8 9 101112131415161718
IS 2 - I Channel Bias
IS 2 - Q Channel Bias
0.002
0.002
0.0019
0.0019
VV from VV_VH
VV from VV_VH
0.0018
VH from VV_VH
0.0017
HV from HV_HH
HH from HV_HH
0.0016
HH
0.0015
bias
bias
0.0018
VH from VV_VH
0.0017
HV from HV_HH
HH from HV_HH
0.0016
HH
0.0015
0.0014
0.0014
0
2
4
6
8 10 12 14 16 18 20
0
2
4
6
8
10 12 14 16 18 20
ENVISAT Validation Workshop - ESRIN – 9-13 December 2002
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I / Q Channel Standard Deviation
IS 2 - Q / I Channel Standard Deviation
IS 7 - Q / I Channel Standard Deviation
0.16
0.11
VV from VV_VH
VH from VV_VH
0.1
HV from HV_HH
0.09
HH from HV_HH
HH
0.08
0.07
0.07
Q standard deviation
standard deviation
0.12
0.15
0.09
0.1
0.11
0.12
VH from VV_VH
0.14
HV from HV_HH
HH from HV_HH
0.13
0.12
0.12
0.08
VV from VV_VH
0.13
0.14
0.15
0.16
I standard deviation
ENVISAT Validation Workshop - ESRIN – 9-13 December 2002
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Noise Power Correction Factor
IS 2 -Noise Power Correction Factor
noise power correction
0.0007
VV from VV_VH
0.0006
VH from VV_VH
HV from HV_HH
0.0005
HH from HV_HH
0.0004
0
2
4
6
8 10 12 14 16 18 20
ENVISAT Validation Workshop - ESRIN – 9-13 December 2002
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Detailed Analysis of an AP IS 2 Product
•
ASA_APH_0PNPDK20021106_094707_000000892011
_00022_03583_0043.N1
•
Netherlands calibration site with transponders in H/V
and H/H polarisation, beam IS 6
•
“nominal timeline anomaly”
•
no anomalies observed
ENVISAT Validation Workshop - ESRIN – 9-13 December 2002
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Downlink Data Quality
•
no missing / erroneous ISPs
•
no missing range lines
•
no errors in analysed auxiliary codes
 perfect downlink data quality
ENVISAT Validation Workshop - ESRIN – 9-13 December 2002
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AP Timeline (Initial Cycle)
•
initial noise : 8 lines in HV and 8 lines in HH
•
initial calibration sequence : 97 pulses in HV and 97
pulses in HH
•
pre-flight observed anomaly in periodic cycle is now
the nominal case handled by PF_ASAR
 timeline according to expectation
ENVISAT Validation Workshop - ESRIN – 9-13 December 2002
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AP Timeline (Periodic Cycles)
specified
pre-flight observed
237 echo + 1 cal in HV
238 echo
in HH
238 echo
in HV
238 echo
in HH
----------------------238 echo
in HV
237 echo + 1 cal in HH
238 echo
in HV
238 echo
in HH
----------------------237 echo + 1 cal in HV
238 echo
in HH
238 echo
in HV
238 echo
in HH
----------------------......
237 echo + 1 cal in HV
237 echo
in HH
237 echo
in HV
238 echo
in HH
----------------------238 echo
in HV
237 echo + 1 cal in HH
238 echo
in HV
238 echo
in HH
----------------------237 echo + 1 cal in HV
237 echo
in HH
237 echo
in HV
238 echo
in HH
----------------------......
ENVISAT Validation Workshop - ESRIN – 9-13 December 2002
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Echo Data Histograms and Statistics
Q channel
I channel
•
no echo
data
saturation
Q channel
•
dynamic
range not
fully used
I channel
HH polarisation
I Bias
= 0.001765
Q Bias
= 0.001854
I Stddev
= 0.122002
Q Stddev
= 0.121865
IQ Gain imbalance
= 1.001119
IQ Non-orthogonality = 0.004364
HV polarisation
I Bias
= 0.001730
Q Bias
= 0.001793
I Stddev
= 0.051607
Q Stddev
= 0.051510
IQ Gain imbalance
= 1.001875
IQ Non-orthogonality = 0.003519
ENVISAT Validation Workshop - ESRIN – 9-13 December 2002
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Echo Data Visual Inspection
HH
no anomalies observed
ENVISAT Validation Workshop - ESRIN – 9-13 December 2002
HV
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Range-Compressed Data Visual Inspection
HH
no anomalies observed
ENVISAT Validation Workshop - ESRIN – 9-13 December 2002
HV
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Detailed Analysis of a GM Product
•
ASA_GM__0PNPDK20021114_071147_000001062011
_00135_03696_0211 in VV polarization
•
region in the north of Russia
•
anomaly observed with instrument characterization
file : wrong subsampling factors for beam SS2 … SS5
corrected INS file delivered by ESRIN
ENVISAT Validation Workshop - ESRIN – 9-13 December 2002
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GM1 Product
ENVISAT Validation Workshop - ESRIN – 9-13 December 2002
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Downlink Data Quality
•
no missing or erroneous source packet
•
no single error in analysed auxiliary codes (PRI,
SWST, SWL, up/down converter, TX pulse length, TX
pulse bandwidth, resampling factor)
 perfect downlink data quality
ENVISAT Validation Workshop - ESRIN – 9-13 December 2002
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Echo Data Histogram
Q
I
SS1
•
•
no echo data saturation
dynamic range not fully used
ENVISAT Validation Workshop - ESRIN – 9-13 December 2002
SS5
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Echo Data Statistics
swath SS1:
I Bias
= 0.001516,
I Stddev
= 0.070892,
IQ Gain imbalance = 1.001307,
Q Bias
= 0.001479
Q Stddev
= 0.070799
IQ Non-orthogonality = 0.002945
swath SS5:
I Bias
= 0.001495,
I Stddev
= 0.080410,
IQ Gain imbalance = 1.000956,
Q Bias
= 0.001429
Q Stddev
= 0.080333
IQ Non-orthogonality = 0.001402
ENVISAT Validation Workshop - ESRIN – 9-13 December 2002
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Echo Data Visual Inspection
SS1
ENVISAT Validation Workshop - ESRIN – 9-13 December 2002
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Range-Compressed Data Visual Inspection
SS1
ENVISAT Validation Workshop - ESRIN – 9-13 December 2002
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Initial Calibration Pulses
SS1
P1
P1A
P2
P3
ENVISAT Validation Workshop - ESRIN – 9-13 December 2002
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Periodic Calibration Pulses
SS1
P1
P1A
ENVISAT Validation Workshop - ESRIN – 9-13 December 2002
P2
P3
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Summary and Conclusions (I)
•
Analysed AP and GM level 0 products show a good
overall product quality.
•
First AP quantitative measurement results could be
obtained, but based on a small variety of products only
•
Only one GM product available
ENVISAT Validation Workshop - ESRIN – 9-13 December 2002
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Summary and Conclusions (II)
•
Detailed analysis of selected level 0 products will be
done only for “suspicious” products in the future
•
The operational PDS tool for a systematic and
automatic parameter evaluation is urgently needed
- as indicator for possible anomalies
- for further overall quality assessment
- for further quantitative measurements
ENVISAT Validation Workshop - ESRIN – 9-13 December 2002
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