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Zusammenfassung |
AB |
[EN] Sub-aperture processing is carried out. Within each sub-aperture, range compression and a correction for the target range variation are carried out. Baseband azimuth scaling is used for processing the azimuth signal, wherein a long azimuth reference function and thus a wide azimuth dimension are prevented. The scaling range is not constant and depends on the range, which is not equal to the original range vector. It is calculated such that, in combination with a subsequent derotation step, constant azimuth scanning is achieved for all ranges. The selected derotation function, which is applied in the azimuth time domain, makes it possible for all the targets to be in base band, in this way varying the effective chirp rate. Since the phase is purely quadratic because of the azimuth scaling step, it is thus possible to use an optimal filter which takes account of the effective chirp rate. IFFT results in a focused image, and a final phase function in the time domain allows phase maintenance. Application for SAR, SONAR and seismic raw data processing in the TOPS mode, as well as other modes which make use of the antenna polar diagram being scanned in the azimuth and/or elevation direction. |
| 56 |
Entgegengehaltene Nichtpatentliteratur/Zitate,
vom Anmelder genannt |
CTNP |
Alberto Moreira et al, :"Extended Chirp Scaling Algorithm for Air- and Spaceborne SAR Data Processing in Stripmap and ScanSAR Imaging Modes", IEEE Transactions on Geoscience and Remote Sensing, IEEE Service Center, Piscataway, New Jersey, US, vol. 34, No. 5, (Sep. 1, 1996) XP011020772 ISSN: 0196-2892. 1;
Andrea Monti Guarnieri et al.: "ScanSAR Focusing and Interferometry", IEEE Transactions on Geoscience and Remote Sensing, IEEE Service Center, Piscataway, New Jersey, US, vol. 34, No. 4, (Jul. 1, 1996), XP011010749, ISSN: 0196-2892. 1;
De Zan F., et al. : "TOPSAR: Terrain Observation by Progressive Scan", IEEE Transactions on Geoscience and Remote Sensing, IEEE Service Center, Piscataway, New Jersey, US, vol. 44, No. 9, (Sep. 1, 2006), 2352-2360, XP009105499, ISSN: 0196-2892. 1;
Mittermayer, J. et al. :"Sliding Spotlight Sar Processing for TerraSAR-X using a New Formulation on the Extended Chirp Scaling Algorithm", IGARSS 2003. IEEE 2003 International Geoscience and Remote Sensing Symposium Proceedings, Toulouse, France, Jul. 21-25, 2003; [IEEE International Geoscience and Remote Sensing Symposium], New York, NY : IEEE, US, vol. 3, 21. (Jul. 21, 2003) 1462-1464, XP010703419 ISBN: 978-0-7803-7929-9. 1;
Moreira, A. et al. :"Azimuth and Range Scaling for SAR and Scan SAR Processing", IGARSS '96. 1996 International GeoScience and Remote Sensing Symposioum 19960527, vol. 2, May 27, 1996, 1214-1216 XP009105500. 1;
Pratl, C. et al. : "Spot Mode SAR Focusing with the W-K Technique", Geoscience and Remote Sensing SYmposium, 1991. IGARSS '91. Remote Sensing: Global Monitoring for Earth Management., International Jun. 3-6, 1991, New York, NY, US IEEE, US., vol. 2, 3 (Jun. 3, 1991), 631-634, XP010041150, ISBN: 978-0-87942-675-0. 1
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