Minimize SAR quality disclaimer

SAR data acquired over specific time intervals is of degraded quality. Data quality disclaimers are issued for each one of those intervals which details are provided below.

Start

UTC

Stop

UTC

Warning

Code

Affected Data Note
31-DEC-2008 22:16:43 01-JAN-2009 06:39:43 Degraded geolocation accuracy All SAR products, including level 0 products

SAR data acquired between orbits 35755 and 35759 show a variable location error in azimuth, ranging up to 6.18 Km. The problem is fully corrected for SAR data acquired since orbit 35760.

25-JUL-2008 07:00:00 25-JUL-2008 11:40:00 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

01-FEB-2008 00:00:00 25-NOV-2008 00:00:00 SAR antenna gain problem Some SAR products, including level 0 products

During the period February to 25th November 2008 some SAR imagery was acquired with an incorrect Sampling Window Start Time (SWST). This meant that affected imagery was acquired with non-nominal incidence angles with differences up to 1.5 degree. For detected imagery there were also problems with the application of the elevation antenna pattern at either near or far range locations (the pattern is not defined for incidence angles outside the nominal range of incidence angles). Further details can be found in ERS-2 SAR Product Verification paper from the 2008 CEOS SAR Workshop (see PCS ERS SAR Article and Studies web page).

04-DEC-2007 18:06:43 06-DEC-2007 00:17:30 Degraded geolocation accuracy All SAR products, including level 0 products

SAR data acquired between orbits 30127 and 30145 show a variable location error in azimuth, ranging up to 12 Km. The problem is fully corrected for SAR data acquired since orbit 30146.

22-JUL-2007 20:41:47 22-JUL-2007 21:36:04 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

27-JUN-2007 10:58:54 27-JUN-2007 12:43:10 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

15-APR-2007 07:32:22 15-APR-2007 09:33:26 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

17-MAR-2007 07:43:40 17-MAR-2007 11:00:38 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

15-MAR-2007 02:09:10 15-MAR-2007 07:05:53 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

03-MAR-2007 08:23:44 03-MAR-2007 12:05:49 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

01-NOV-2006 00:00:00 28-FEB-2007 00:00:00 Degraded SAR GM product quality All SAR GM products, including level 0 products

Due to archiving problem, the overall quality of SAR GM products acquired between November 2006 and February 2007, covering the South America and Indonesia areas might be degraded. Processing artifacts as azimuth stripe and subswaths discontinuity are visible. A reprocessing activity is currently on-going. SAR GM users are invited to check the available quick-looks by Eoli before ordering the products.

04-FEB-2007 16:51:13 23-FEB-2007 00:00:00 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. NRT products processed by the following auxiliary data: ASA_XCA_AXXIEC20061221_143253_20050916_195733_20071231_000000, ASA_CON_AXXIEC20061107_090002_20050916_195733_20071231_000000, ASA_CON_AXVIEC20070215_184018_20070204_165113_20071231_000000 has significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

03-JAN-2007 07:37:20 03-JAN-2006 09:14:26 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

24-DEC-2006 07:51:56 24-DEC-2006 11:14:05 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

24-OCT-2006 04:43:30 24-OCT-2006 09:42:25 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

17-OCT-2006 16:23:20 17-OCT-2006 20:00:54 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

06-OCT-2006 07:35:40 06-OCT-2006 11:15:30 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

03-SEP-2006 16:05:12 03-SEP-2006 18:07:40 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

03-SEP-2006 01:19:40 03-SEP-2006 06:28:16 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

24-AUG-2006 12:56:47 24-AUG-2006 16:47:19 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

17-AUG-2006 03:26:46 21-AUG-2006 14:56:00 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

08-AUG-2006 01:38:00 08-AUG-2006 08:28:56 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

04-AUG-2006 07:15:00 04-AUG-2006 10:30:10 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

26-JUL-2006 13:15:00 26-JUL-2006 13:41:43 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

01-JUL-2006 03:00:00 01-JUL-2006 08:16:10 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

22-JUN-2006 16:00:00 22-JUN-2006 17:49:40 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

25-MAY-2006 02:33:46 25-MAY-2006 7:45:47 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

22-MAY-2006 07:32:43 22-MAY-2006 11:23:16 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

11-MAY-2006 03:13:20 11-MAY-2006 06:41:30 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

30-APR-2006 10:53:00 30-APR-2006 14:04:03 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

25-APR-2006 13:22:31 25-APR-2006 15:02:48 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

2006 03:47:51 24-APR-2006 07:17:00 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

12-APR-2006 19:53:48 12-APR-2006 20:19:55 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

20-MAR-2006 02:12:44 20-MAR-2006 07:20:50 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

28-FEB-2006 02:37:34 28-FEB-2006 07:49:38 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

22-FEB-2006 10:12:25 22-FEB-2006 15:14:13 Degraded SAR Global Monitoring Mode radiometric quality SAR Global Monitoring Mode (GMM) products

Radiometric quality of SAR Global Monitoring Mode (GMM) data acquired on 22 February from 10:12:25 UTC until 15:14:13 UTC, corresponding to orbits 20818, 20819 and 20820 may be degraded since a test with the SAR instrument will be performed during this time. Data acquired during this time interval in modes other than GMM is NOT affected. GMM data acquired immediately before and after this period is NOT affected.

22-FEB-2006 00:43:46 22-FEB-2006 11:21:32 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

01-MAR-2002 00:00:00 10-FEB-2006 00:00:00 Deagraded geolocation accuracy solved for all SAR Alternating Polarisation (AP) Level-1 products processed with PF-SAR version 4.02 All SAR Alternating Polarisation (AP) Level-1 products

The shift in the zero-doppler azimuth times for AP level 1 products has been solved for the products processed with PF-SAR version 4.02. The PF-SAR 4.02 is available at the following centres for which the installation date is reported: PDHSK (02-02-2006), PDHSE (02-02-2006), I-PAC (02-02-2006), LRAC (02-02-2006), UK-PAC (07-02-2006), D-PAC (09-02-2006).

25-JAN-2006 17:10:27 25-JAN-2006 20:31:34 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

11-DEC-2005 10:53:54 11-DEC-2005 14:14:52 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

20-NOV-2005 20:15:13 20-NOV-2005 23:28:50 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

01-MAR-2002 00:00:00 10-FEB-2006 00:00:00 Deagraded geolocation accuracy All SAR Alternating Polarisation (AP) Level-1 products processed with PF-SAR version lower than 4.1.1

There is a shift in the zero-Doppler azimuth times annotated in the AP Level-1 products (this applies to the product zero-Doppler times and does not apply to other external times, such as the state vectors azimuth times). Full details on the impact on the product geolocation accuracy and the strategy for correcting products 'a-posteriory' can be found on http://envisat.esa.int/dataproducts/availability/disclaimers/PQD_0082ASA_all.pdf

21-OCT-2005 07:34:39 21-OCT-2005 09.34.58 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

16-SEP-2005 19:57:33 14-OCT-2005 00:00:00 SAR antenna gain problem Quality of SAR Level-1 and Level-2

Quality of SAR Level-1 and Level-2 products acquired between 16-09-2005 19:57:33 UTC and 14-10-2005 00:00:00 is slightly degraded for NRT products while it is nominal products generated on-request after 14-10-2005 00:00:00. Quality of products acquired after 14-10-2005 00:00:00 is nominal.

14-SEP-2005 08:00:40 16-SEP-2005 19:57:33 SAR antenna gain problem Quality of SAR Level-1 and Level-2

Quality of SAR Level-1 and Level-2 products is slightly degraded due to a temporal modification of the antenna radiation patterns.Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

24-AUG-2005 01:09:08 24-AUG-2005 07:55:55 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

03-AUG-2005 17:09:54 03-AUG-2005 22:08:56 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

24-JUL-2005 02:22:42 24-JUL-2005 07:31:40 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

05-JUL-2005 14:16:58 05-JUL-2005 17:27:11 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

01-JUN-2005 13:29:28 01-JUN-2005 16:45:00 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

18-MAY-2005 10:58:16 18-MAY-2005 13:58:00 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

12-MAY-2005 07:26:02 12-MAY-2005 10:50:00 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

22-MAR-2005 00:54:10 22-MAR-2005 09:09:10 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

25-JAN-2005 02-FEB-2005 Not Applicable All SAR Low bit rate products(Wave and GM), including level 0 products aquired atPDHS-E (ESRIN)

Due to a problem on the ESRIN Low Bit Rate acquistion chain, the SAR Wave and GM data could be of bad quality.

09-JAN-2005 03:13:21 09-JAN-2005 06:45:03 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

05-DEC-2004 10:03:48 05-DEC-2004 15:35:42 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

02-NOV-2004 14:17:25 03-NOV-2004 10:04:58 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

16-Sep-2004 03:36:39 16-Sep-2004 08:53:15 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

12-Sep-2004 03:46:00 12-Sep-2004 12:40:00 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

12-Aug-2004 13:53:54 12-Aug-2004 19:09:50 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

14-AUG-2004 07:36:00 17-AUG-2004 10:57:45 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

2004 02:00:00 04-Aug-2004 09:26:00 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

21-Jun-2004 07:56:33 22-Jun-2004 11:50:18 SAR in YSM (no in SYSM) All SAR products, including level 0 products

SAR is nominaly operating in Stellar Yaw Steering mode (SYSM). Due to a temporary unavailability of the SYSM during this period, the instruments were operated in Yaw Steering Mode (YSM). Small differences in the attitude stability are expected with possible bias in the measured SAR Doppler Centroid frequencies of 100-300 Hz.

18-Nov-2003 00:00:00 22-May-2004 00:00:00 Degraded SAR Global Monitoring Mode location accuracy All SAR Global Monitoring level 1 products (ASA_GM1_1P) products.

ASA_GM1_1P products acquired during this period show a variable location error in azimuth, ranging up to 40 Km. The location error in ASA_GM1_1P products acquired before 22-May-2004 can be corrected on the user side simply by multiplying the line numbers in the Geolocation Grid ADS by 0.97169. The problem is fully corrected for GM data acquired since 22-May-2004 (i.e. no correction required to get a correct location accuracy).

13-Feb-2004 13:38:00 14-Feb-2004 11:06:01 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

20-Feb-2004 18:00:00 23-Feb-2004 13:08:00 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

04-Jan-2004 09:15:00 05-Jan-2003 15:25:20 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

04-Dec-2003 21:55:23 04-Dec-2003 22:03:31 SAR Data acquired in FPM All SAR products, including level 0 products

SAR is nominaly operating in Stellar Yaw Steering mode (SYSM). SAR was recovered from PLSOL and returned to operations on 04-Dec-2003 21:05:23 UTC. SAR was operated in Fine Pointing Mode (FPM) since 21:55:23 UTC until 22:03:31 UTC. Quality of SAR data acquired in FPM (04-Dec-2003 21:55:23 UTC until 22:03:31 UTC) might be degraded.

11-Dec-2003 01:45:00 11-Dec-2003 15:11:15 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

28-Oct-2003 06:26:28 28-Oct-2003 13:10:01 warning code: Data acquired in FPM All SAR products, including level 0 products

SAR is nominaly operating in Stellar Yaw Steering mode (SYSM). SAR returned to nominal operation after an OCM manoeuvre performed on 28-OCT-2003 06:26:28 UTC, where the satellite was still in Fine Pointing Mode (FPM) and YSM operations were resumed at 18:01:01. Quality of SAR data acquired in FPM (28-OCt-2003 06:26:28 until 10:10:01 UTC) might be degraded

19-Oct-2003 12:50:59 20-Oct-2003 15.37.47 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

03-Aug-2003 21:15:00 04-Aug-2003 12:43:00 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

10-Jul-2003 20:20:00 11-Jul-2003 16:57:00 SAR antenna gain problem All SAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).