1 / 9

ASAR Wide Swath Complex Products User group meeting

ASAR Wide Swath Complex Products User group meeting. B. Rosich ESA-ESRIN, Earth Observation Ground Segment Department. INTRODUCTION. ASAR Wide Swath Complex (WSS) products were not part of the standard ESA set of products A prototype WSS processor was developed by Polimi/Poliba

favian
Download Presentation

ASAR Wide Swath Complex Products User group meeting

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. ASAR Wide Swath Complex ProductsUser group meeting B. Rosich ESA-ESRIN, Earth Observation Ground Segment Department

  2. INTRODUCTION • ASAR Wide Swath Complex (WSS) products were not part of the standard ESA set of products • A prototype WSS processor was developed by Polimi/Poliba • Based on the increasing interest in the new product type and on the new applications offered by the new product, it was decided to convert it into a standard ESA product • The WSS processing is being implemented in the ESA ASAR processor (PF-ASAR) based on Polimi/Poliba prototype: • - the activity started on October 2003 • - Final delivery is foreseen by 30 July 2004 • - Operational distribution to users by in PDS is foreseen before the end of 2004. • A WSS user group meeting was created to prepare the use of WSS products. Feedback is extremely important to ensure that the final ESA WSS product will meet the user requirements.

  3. Main WSS features • The new ESA WSS standard product • is based on Polimi prototype and follows the same basic strategy: • there will be 5 different MDSs, one per sub-swath • processing will be phase preserving • elevation antenna pattern correction is applied by default • data will be sampled in a common grid both in range and in azimuth. • standard product is 60 sec long with 80 m az. pixel spacing . • line numbers will be reset to 0 at the start of each sub-swath and the time of the first line will be made the same for all swaths. • re-uses PF-ASAR existing algorithms/processes: • pre-processing / post-processing • focusing will be based on the Range-Doppler algorithm • and introduces some additional information: • - Doppler Grid ADS • - timeline information

  4. DOPPLER GRID ADS • The new Doppler Grid ADS: • has been introduced in response to ocean wind-wave application requirements • provides a grid of Doppler fine estimates in range and azimuth • these estimates correspond to the multiple estimates made by the processor and nominally used to fit the Doppler polynomial across range • density of estimates in range and azimuth is currently limited in PF-ASAR – under investigation • will be included only in WSS products (performance problems to include it in all) • validation is to be performed - 2 examples provided to Ifremer

  5. 356 samples ~4.3 sec ~ 28 Km =20 cycles ~4 sec . . . . . . . . . . 1,1 1,2 1,3 1,4 1,99 1,100 . . . . . . . . . . 2,1 2,2 2,3 2,4 2,99 2,100 . . . . . . . . . . 3,1 3,2 3,3 3,4 3,99 3,100 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12,1 12,2 12,3 12,4 12,99 12,100 PRELIMINARYDOPPLER GRID GENERATION • Preliminary Doppler grid for a 60 sec WS product: • 100 estimates across full range (20 per sub-swath) • 12 estimates in azimuth

  6. PRELIMINARYDOPPLER GRID ADS ~ 4 Km ………………. 1,1 1,2 1,3 1,4 1,98 1,99 1,100 ~ 28 Km ………………. • Annotated • Doppler Grid information: • fine Doppler Centroid at each tie point • slant range time to each of the 100 range estimates • - azimuth time for each set of 100 range estimates – 1 tie point every 4.3 seconds 2,1 2,2 2,3 2,4 2,98 2,99 2,100 ………………. 3,1 3,2 3,3 3,4 3,98 3,99 3,100 . . . . . . . . . . . . . . . . . . . . . ………………. 12,1 12,2 12,3 12,4 12,98 12,99 12,100

  7. DOPPLER GRID ADS ~ 4 Km ………………. 1 sec ~ 6.5 Km 1,1 1,2 1,3 1,4 1,98 1,99 1,100 ………………. 2,1 2,2 2,3 2,4 2,98 2,99 2,100 ………………. 3,1 3,2 3,3 3,4 3,98 3,99 3,100 • Annotated Doppler Grid final information: • fine Doppler Centroid at each tie point • slant range time to each of the 100 range estimates • - azimuth time for each set of 100 range estimates– 1 tie point every 1 second ………………. 4,1 4,2 4,3 4,4 4,98 4,99 4,100 ………………. 5,1 5,2 5,3 5,4 2,98 5,99 5,100 ………………. 6,1 6,2 6,3 6,4 6,98 6,99 6,100 . . . . . . . . . . . . . . . . . . . . . ………………. 60,1 60,2 60,3 60,4 60,98 60,99 60,100

  8. Available in WSM products Available in WSM products TIMELINE INFORMATION • Information on WS-WS burst synchronisation can be derived based on: • Accurate Doppler Centroid frequency estimate • Orbit state vectors • Timeline reference point (i.e. echo pulse CPC, echo pulse sensing time, echo pulse beam) Will be added in new version

  9. WSS PRODUCT FORMAT MPH SPH 5 SQ ADS records: 1 per sub-swath SQ ADS 5 MPP ADS records: 1 per sub-swath MPP ADS As for WSM products but provides 5 separate polynomials Doppler ADS As for WSM products Chirp Parameters ADS As for WSM products Elevation antenna pattern 1 ADSR per burst and beam, 1 burst ADSR every 10 burst Geolocation Grid ADS 100 tie points in range every 1 second in azimuth Doppler Grid ADS MDS1 MDS2 MDS3 MDS4 MDS5

More Related