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Nettie La Belle-HamerASF Science Center Manager
Alaska SAR FacilityGeophysical Institute
University of Alaska Fairbanks
ASF Capabilities
• Downlinking
• Processing
• Near Real Time for L1 and L0
• Archiving and Distribution
ASF Satellite Tracking
ASF currently operates two independent tracking systems,– Scientific Atlanta 10m X-band/S-band tracker,
installed to support ERS-1, JERS, and Radarsat acquisitions
– Scientific Atlanta 11.24m X-band/S-band tracker, installed to support ADEOS
ASF Host Controller
ASF utilizes an ASF-designed and built tape recorder management system– schedules tape resources for both tracking systems– manages High Density Digital Recorders (HDDRs)
before, during, and after acquisitions– generates all required metadata for flight agency and
ASF internal processing– permits simultaneous tracker operation, with best
utilization of HDDR resources
ASF Receiving Ground Station
The ASF Receiving Ground System incorporates a tracker scheduling element, which de-conflicts multi-mission requirements, and generates conflict-free schedules for each ASF tracking system
Processing at ASF
• Level-1 Processors– Precision Processor– ScanSAR Processor– ASP (Hardware)– Focus– Alaska Interferometric SAR Processor
• Level-0 Processors– Operational system– MAMM system
0
5
10
15
20
25
30
35
1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001
TB
of
Da
ta i
n A
rch
ive
ERS-1
JERS-1
ERS-2
RADARSAT-1
Signal Data at ASF
•7x24 facility
•track record for high volume, high quality data processing
Archive holdings as of Oct 2001
R151%
J116%
E122%
E211%
Satellite Seconds of data TB of dataERS-1 4,244,912 56ERS-2 2,058,887 27JERS-1 3,165,045 24RADARSAT-1 10,116,362 126Total 19,585,205 232
Quick Look Delivery Times to NIC Oct 98-Sep 01
0
100
200
300
400
500
600
700
800
900
1000
Nu
mb
er o
f F
ram
es
less than 4 hours
greater than 4 hours
Support for Real World Applications
• Emergency support– for the Coast Guard for images used in
search and rescue of Chinese trawler. (6 November, 2000)
– for urgent data requests from NIC– for the Vice President for images of flooding
• Ice Community support– ASF’s RGPS provides geophysical ice
products to the ice science community.
ASF RGS
The ASF Receiving Ground System currently supports data acquisition to the following tape resources,– Sony ID-1– Ampex DCRSi
Level 1 volume in MB from Sep 96- Oct 01
0
50000
100000
150000
200000
250000
300000
350000
400000
450000
500000
Quick Look Delivery Times to NIC Oct 98-Sep 01
0
100
200
300
400
500
600
700
800
900
1000
Nu
mb
er o
f F
ram
es
less than 3 hours
greater than 3 hours