Communications: directive radio wave systems and devices (e.g. – Clutter elimination
Patent
1999-05-21
2000-02-22
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
Clutter elimination
162196, G01S 1390
Patent
active
060285494
ABSTRACT:
For the detection and suppression of interfering signals in SAR data, a time-domain noisy raw data signal U.sub.T (t) is Fourier-transformed by range lines in raw frequency-domain spectrum U.sub.T (f). The resulting spectrum U.sub.T (f) is law-pass filtered according to a transmission-signal bandwith B.sub.s to yield a useful spectrum U.sub.T (f) and an autocorrelation function (t) of useful spectrum U.sub.T (f) is determined in the time domain. A weighting function w(t) is used to suppress portions of the useful signal in the autocorrelation function (t), thereby intensifying the interfering signal in relation to the autocorrelation function (t). The resulting signal (t) is transformed into a power spectral density (f) and a threshold value m is calculated from the power spectral density (f) with a MADMED function. A final notch filter W.sub.N (f) is generated by Fourier-transforming the ideal notch filter frequency response W.sub.N ideal (f).
REFERENCES:
patent: 5111823 (1992-05-01), Cohen
patent: 5383457 (1995-01-01), Cohen
patent: 5546085 (1996-08-01), Garnaat et al.
patent: 5969662 (1999-10-01), Hellsten
"Interrelated problems in space-time processing for SAR and ISAR", Klemm, R., Radar, Sonar and Navigation, IEE Proceedings--vol.: 145 5, Oct. 1998, Page(s): 297-302, 1997.
"Removing RF interferences from P-band airplane SAR data", Cazzaniga, G.; Monti Guarnieri, A.,Geoscience and Remote Sensing Symposium, 1996. IGARSS'96. `Remote Sensing for a Sustainable Future.`, International vol.: 3, 1996, Page(s): 1845-1847 vol.3.
"Estimation of the SAR system transfer function through processor defocus", Vachon, P.W.; Raney, R.K,.Geoscience and Remote Sensing, IEEE Transactions on vol.: 27 6, Nov. 1989, Page(s): 702-708.
"Estimating the correlation properties of k-distributed SAR clutter", Lombardo, P.; Oliver, C.J., Radar, Sonar and Navigation, IEE Proceedings--vol.: 142 4, Aug. 1995, Page(s): 167-178.
"Three-channel Wiener filter for suppression of speckle noise in SAR images of ocean scenes", Guy, E.V.; Khan, R.H., Electrical and Computer Engineering, 1994. Conference Proceedings. 1994 Canadian Conference on, 1994, Page(s):433-436 vol.2.
"A comparison of simulation techniques for correlated gamma and K-distributed images for SAR applications", Blacknell, D.; Blake, A.; Lombardo, P.; Oliver, C.J., Geoscience and Remote Sensing Symposium, 1994. IGARSS'94. Surface and Atmospheric Remote Sens.
"Comments on "Statistical and spatial properties of forest clutter measured with polarimetric synthetic aperture radar"", Blacknell, D.; Oliver, C.J., Geoscience and Remote Sensing, IEEE Transactions on vol.: 31 5, Sep. 1993, Page(s): 1093-1094.
"Overview of the HDL impulse synthetic aperture radar", McCorkle, J.W., Antennas and Propagation Society International Symposium, 1992. AP-S. 1992 Digest. Held in Conjuction with: URSI Radio Science Meeting and Nuclear EMP Meeting., IEEE, 1992, Page(s):.
"Statistical and spatial properties of forest clutter measured with polarimetric synthetic aperture radar (SAR)", Sheen, D.R.; Johnston, L.P., Geoscience and Remote Sensing, IEEE Transactions on vol.: 30 3, May 1992, Page(s): 578-588.
Cazzaniga et al., "Removing RF interferences from P-Band airplane SAR data.", GARSS'96, pp.1845-1847, (1996).
Buckreuss Stefan
Sutor Thomas
Deutsches Zentrum fur Luft-und Raumfahrt e.V.
Sotomayor John B.
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