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Abstract |
AB |
[EN] A continually adapted pulse-to-pulse shift, performed in the azimuth direction, of the phase center which is electrically active on the side of the transmitting antenna (Tx; Tx1, Tx2, Tx3), in connection with the SAR antenna control of a multi-aperture SAR system is designed such that, in the case of an existing pulse repetition frequency (PRF) due to the likewise shifted position of the effective phase center of the entire antenna (Tx; Tx1, Tx2, Tx3; Rx; Rx1, Rx2, Rx3), a compensation or complete correction of non-equidistant scanning in the azimuth direction is achieved. The principle of the pulse-to-pulse shift of the position of the effective phase center of the antenna for achieving the best possible equidistant scanning can be expanded to the side of the receiving antenna (Rx; Rx1, Rx2, Rx3) and to multi-aperture antennas. The technological solution proposed by the invention can be advantageously combined with a subsequent digital beam formation on the receiving antenna side. |
| 56 |
Cited non-patent literature identified in the search |
CTNP |
Krieger, G. Gebert, N.; Moreira, A.; "Unambiguous SAR signal reconstruction from nonuniform displaced phase center sampling" Aug. 2004, Geoscience and Remote Sensing Letters, IEEE, vol. 1, issue 4, pp. 260-264. 0;
Krieger, G.; Gebert, N.; Moreira, A.; "Unambiguous SAR signal reconstruction from nonuniform displaced phase center sampling", Aug. 2004, Geoscience and Remote Sensing Letters, IEEE, vol. 1, issue 4, pp. 260-264. 0
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| 56 |
Cited non-patent literature indicated by the applicant |
CTNP |
Cooper, P.S. et al; "High resolution synthetic aperture radar using a multiple sub-band technique"; Radar '97, Edinburgh, Oct. 14-16, 1997; IEE Conference Publication, London; IEE, GB; vol. No. 449, pp. 263-267. 1;
Diego Cristallini et al.; "Adaptive antenna configuration for unambiguous signal reconstruction in dual-channel SAR systems"; Radar Conference, 2007; EuRAD 2007; European, 20071001 IEEE, Pi; pp. 107-110. 1;
Gebert, N. et al.; "SAR signal reconstruction from non-uniform displaced phase centre sampling in the presence of perturbations"; Geoscience and Remote Sensing Symposium, 2005; IGARSS '05; Proceedings; 2005 IEEE International Seoul, Korea, Jul. 25-29, 2005; Piscataway, NY, USA, IEEE, vol. 2, pp. 1034-1037. 1;
Krieger G. et al., "SAR signal reconstruction from non-uniform displaced phase centre sampling"; Geoscience and Remote Sensing Symposium, 2004; IGARSS '04; Proceedings; 2004 IEEE International Anchorage, AK, USA, Sep. 20-24, 2004; Piscataway, NJ, USA, IEEE, vol. 3, pp. 1763-1766. 1;
Krieger, G. et al.; "Unambiguous SAR Signal Reconstruction From Nonuniform Displaced Phase Center Sampling"; IEEE Geoscience and Remote Sensing Letters, 20041001 IEEE Service Center, New York, NY, US; vol. 1, Nr. 4, pp. 260-264. 1;
Lombardo, P. et al.; "An alternating transmit approach for STAP with short antenna arrays"; Radar Conference, 2004; Proceedings of the IEEE Philadelphia, PA, USA, Apr. 26-29, 2004; Piscataway, NJ, USA, IEEE; pp. 420-425. 1;
Sedehi, M. et al.; "A Study for a Space-Based Passive Multi-Channel SAR"; GTTI Annual Meeting (Gruppo nazionale Telecomunicazioni e Teoria dell'Informazione), 20070618; 20070618-20070620; pp. 1-16. 1;
Seuss, M. et al.; "A novel high resolution, wide swath SAR system"; IGARSS 2001. IEEE 2001 International Geoscience and Remote Sensing Symposium, Sydney, Australia; Jul. 9-13, 2001; New York, NY; IEEE, US; vol. 3, pp. 1013-1015. 1;
Wu Shunhua et al.; "Analysis and simulation of spatial interval non-uniform samples in azimuth multiple phase centers SAR"; Signal Processing, 2004; Proceedings; ICSP '04 2004; 7th International Conference on Beijing, China; Aug. 31-Sep. 4, 2004; Piscataway, NJ, USA, IEEE; vol. 3, pp. 2175-2178. 1;
Younis, M.; "Digital Beam-Forming for High-Resolution Wide Swath Real and Synthetic Aperture Radar"; Forschungsberichte aus dem Institute fur Hochstfrequenztechnik and Elektronik der Universitat Karlsruhe (TH), 20040722 Prof. Dr.-Ing. W. Wiesbeck. 1
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