Communications: directive radio wave systems and devices (e.g. – Clutter elimination
Reexamination Certificate
2006-12-05
2006-12-05
Gregory, Bernarr E. (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Clutter elimination
C342S02600R, C342S02600R, C342S027000, C342S028000, C342S089000, C342S091000, C342S093000, C342S094000, C342S118000, C342S175000, C342S188000, C342S195000
Reexamination Certificate
active
07145503
ABSTRACT:
A surface wave radar system including a receive antenna array (20, 22) for generating receive signals, and a data processing system (24) for processing received data representing the receive signals to mitigate ionospheric clutter. The received data is range and Doppler processed, and a spatial adaptive filter (52) is trained using training data selected from the processed data. The training data includes ionospheric clutter data and excludes cells which contain target data and substantial sea clutter. The processed data is filtered using the filter (52), which may be based on loaded sample matrix inversion. The antenna array (20,22) may be two-dimensional having an L or T shape.
REFERENCES:
patent: 3705407 (1972-12-01), Wickersham
patent: 6246365 (2001-06-01), Tokoro
patent: 658410 (1992-11-01), None
patent: 2013784 (1994-05-01), None
patent: 2160452 (2000-12-01), None
patent: WO 92/21041 (1992-11-01), None
A.M. Ponsford, “A Comparison Between Predicted and Measured Sea Echo Doppler Spectra for Surface Wave Radar”; IEEE Publication 0-7803-1385-2/93/$3.00; 1993.
T.M. Blake, “Ship Detection and Tracking Using High Frequency Surface Wave Radar”; “HF Radio Systems and Techniques” Conference Publication No. 411; IEE, 1997.
H. Leong, “Adaptive Nulling of Skywave Interference Using Horizontal Dipole Antennas in a Costal Surveillance HF Surface Radar System”; Radar '97 Conference Publication No. 449; Oct. 14-16, 1997.
H.W.H. Leong, Adaptive Suppression of Skywave Interference in HF Surface Wave Radar Using Auxiliary Horizontal Dipole Antennas; IEEE Publication 0-7803-5582-2/99/$10.00; 1999.
S.J. Ablett et al., “Waveform Parameter Advice: A Clutter Evaluation Tool for High Frequency Surface Wave Radar”; “HF Radio Systems and Techniques” Publication No. 474; no date given.
L. Pederson et al., “HF Surface-Wave Radar: Revisiting a solution for EEZ ship surveillance”; posted on the Internet at eezinternational.com; no date given.
D. Barrett, “The Chain Home radar system”; posted on the Internet at radarpages.co.uk; copyright 2000-2005.
“An Integrated Maritime Surveillance System Based on High-Frequency Surface Wave Radars, Part 1: Theroretical Background and Numerical Simulations”, Wevgi, A Ponsford and H C Chan, IEEE Antennas and Propagation Magazine, vol. 43. No. 4, pp. 28-43, Aug. 2001.
“An integrated Surveillance System Based on High-Frequency Surface Wave Radars, Part 2: Operational Status and System Performance”, A Ponsford, L Sevgi, H C Chan, IEEE Antennas and Propagation Magazine, vol. 43, No. 5, pp. 52-63, Oct. 2001.
Abramovich, Y.I., et al.: “Experimental Trials on Non-Gaussian Environmental Noise Mitigation for Surface-Wave Over-the-Horizon Radar by Adaptive Antenna Array Processing,” Higher Order Statistics, 1999. Proceedings of the IEEE Signal Processing Workshop on Caesarea, Israel Jun. 14-16, 1999, Los Alamitos, CA, USA, IEEE Comput. Soc., US. Jun. 14, 1999, pp. 340-344.
Leong, H.W.H.: “Adaptive Suppression of Skywave Interference in HF Surface Wave Radar Using Auxiliary Horizontal Dipole Antennas,” Communications, Computers and Signal Processing, 1999 IEEE Pacific Rim Conference on Victoria, BC, Canada, Aug. 22-24, 1999, Piscataway, NJ, USA, IEEE, USA, Aug. 22, 1999, pp. 128-132.
Kraut, S., et al.: “Space-Time Adaptive Processing For Over-the-Horizon Spread-Doppler Clutter Mitigation,” Proceedings of the 2000 IEEE Sensor Array and Multichannel Signal Processing Workshop, Duke University, Durham, NC, USA, Mar. 16-17, 2000, pp. 245-249.
Ablet, S.J., et al.: “Waveform Parameter Advice: A Clutter Evaluation Tool for High Frequency Surface Wave Radar,” Eight International Conference on HF Radio Systems and Techniques (IEE Conf. Publ. No. 474)., Jul. 10-13, 2000, pp. 213-217.
“Modern Radar Techniques”, M.J.B. Scanlan, pp. 200-2003 and 224-227.
“Radar Handbook”, Skolnik Second Edition, 1990, pp. 24.1, 24.2, 24.38-40.
“A Radar History of Work War II, Technical and Military Imperatives”, Brown, IOP Publishing Ltd., 1999, pp. 48-59.
“History, Present Status, and Future Directions of HF Surface-Wave Radars in the US”, Barrick, IEEE, 2003, pp. 652-655.
Abramovich Yuri
Ellard Robert M
Lyudviga Yuriy
Spencer Nicholas Keith
Turcaj Pavel
Gregory Bernarr E.
Sughrue & Mion, PLLC
Telstra Corporation Limited
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