United States Patent 8,373,591
System and Method For Sensing Aircraft and
Other Objects
Application Number 12,910,779
Filed 10/22/2010
Issued 2/12/2013
Jed Margolin
Abstract
A system for sensing aircraft and other objects uses bistatic radar with spread-spectrum signals transmitted from remotely located sources such as aircraft flying at very high altitudes or from a satellite constellation. A bistatic spread spectrum radar system using a satellite constellation can be integrated with a communications system and/or with a system using long baseline radar interferometry to validate the digital terrain elevation database. The reliability and safety of TCAS and ADS-B are improved by using the signals transmitted from a TCAS or ADS-B unit as a radar transmitter with a receiver used to receive reflections. Aircraft and other objects using spread spectrum radar are detected by using two separate receiving systems. Cross-Correlation between the outputs of the two receiving systems reveals whether a noise signal is produced by the receiving systems themselves or is coming from the outside.
Jed Margolin
Virginia City Highlands, NV
April 25, 2013
When the Examiner required a restriction I chose the embodiment of the bistatic spread spectrum radar system using a satellite constellation or high flying aircraft. See the patent claims for the legal definition of the invention.
I filed a divisional application for the embodiment using ADS-B as a radar.
References
The listed links are the original
links. In some cases they may be broken. The PDF version was made from the
original link.
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Ref. 1: 14 CFR § 91.113(b) Right-of-way rules: Except water operations. http://ecfr.gpoaccess.gov/cgi/t/text/text-idx?c=ecfr&sid=4f09aa904bfbb808de07eada6cb86e5a&rgn=div8&view=text&node=14:2.0.1.3.10.2.4.7&idno=14 |
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Ref. 2: 14 CFR § 91.115(a) Right-of-way rules: Water operations. http://ecfr.gpoaccess.gov/cgi/t/text/text-idx?c=ecfr&sid=4f09aa904bfbb808de07eada6cb86e5a&rgn=div8&view=text&node=14:2.0.1.3.10.2.4.8&idno=14 |
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Ref. 3: U.S. Patent 4,782,450 Method and apparatus for passive airborne collision avoidance and navigation issued November 1, 1988 to Flax. |
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Ref. 4: Introduction to TCAS II Version 7, United States Department of Transportation, Federal Aviation Administration November 2000. www.arinc.com/downloads/tcas/tcas.pdf |
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Ref 5: U.S. Patent 5,153,836 Universal dynamic navigation, surveillance, emergency location, and collision avoidance system and method, Fraughton, et al., October 6, 1992. |
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Ref. 6: Gulf of Mexico Helo Ops Ready for ADS-B, Aviation Week & Space Technology, Francis Fiorino, 02/26/2007, page 56. |
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Ref. 7: U. S. Patent 5,187,485 Passive ranging through global positioning system, Tsui, et al., February 16, 1993. |
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Ref. 8: Test Results from a Novel Passive Bistatic GPS Radar Using a Phased Sensor Array, Alison Brown and Ben Mathews, NAVSYS Corporation, Proceedings of ION NTM 2007, San Diego, CA, January 2007. www.navsys.com/Papers/07-01-002.pdf |
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Ref. 9: U.S. Patent 5,724,041 Spread spectrum radar device using pseudorandom noise signal for detection of an object issued March 3, 1998 to Inoue, et al. |
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Ref. 10: Shift Register With Feedback Generates White Noise, Marc Damashek, Electronics magazine, May 27, 1976. |
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Ref. 11: U.S. Patent 4,195,293 Random dot generator for raster scan video displays issued March 25, 1980 to Margolin. |
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Ref. 12: U.S. Patent 3,986,168 Multichannel error signal generator issued October 12, 1976 to Anderson. |
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Ref. 13: U.S. Patent 3,515,805 Data scrambler issued June 2, 1970 to Fracassi et al. |
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Ref. 14: Shift Register Sequences, S. Golomb (Holden-Day Inc., San Francisco, 1967, and Aegean Park Press, 1982) |
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Ref. 15: The ABCs of Spread Spectrum - A Tutorial, Randy Roberts, Director of RF/Spread Spectrum Consulting. http://sss-mag.com/ss.html |
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Ref. 16: Undetectable Radar? (Probably Not), Erik Hundman, Defensetech.org, August 3, 2006. http://www.defensetech.org/archives/002641.html |
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Ref. 17: From a Different Perspective: Principles, Practice, and Potential of Bistatic Radar by H.D. Griffiths, Dept. of Electron. & Electr. Eng., Univ. Coll. London, UK; Radar Conference, 2003. Proceedings of the International; Publication Date: 3-5 Sept. 2003; ISBN: 0-7803-7870-9; INSPEC Accession Number: 7892750 |
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Ref. 18: Sensing Requirements for Unmanned Air Vehicles, AFRL's Air Vehicles Directorate, Control Sciences Division, Systems Development Branch, Wright-Patterson AFB OH, June 2004, http://www.afrlhorizons.com/Briefs/Jun04/VA0306.html . |
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Ref. 19: Presentation entitled, Developing Sense & Avoid Requirements for Meeting an Equivalent Level of Safety (6MB | ppt), given by Russ Wolfe, Technology IPT Lead, Access 5 Project at UVS Tech 2006. 18 January 2006. |
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Ref. 20: Presentation Integration into the National Airspace System (NAS) given by John Timmerman of the FAA’s Air Traffic Organization (July 12, 2005) |
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Ref. 21: Zone Ready for Drone, April 7, 2006, on the web site for the FAA’s Air Traffic Organization Employees, http://www.ato.faa.gov/DesktopDefault.aspx?tabindex=4&tabid=17&itemid=937&mid=103 |
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Ref. 22: Quadrennial Roles and Missions Review Report, Department of Defense, January 2009. Page 29 (PDF page 37) www.defenselink.mil/news/Jan2009/QRMFinalReport_v26Jan.pdf |
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Ref. 23: Analog Devices, Inc. AD9481: 8-Bit, 250 MSPS, 3.3 V A/D Converter http://www.analog.com/en/analog-to-digital-converters/ad-converters/ad9481/products/product.html |
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Ref. 24: Texas Instruments C6713B http://focus.ti.com/docs/prod/folders/print/tms320c6713b.html#features |
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Ref. 25: U.S. Patent 6,377,436 Microwave Transmission Using a Laser-Generated Plasma Beam Waveguide issued April 23, 2002 to Margolin. |
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Ref. 26: Simple Solutions for Hyperbolic and Related Position Fixes, Bertrand T. Fang, The Analytic Sciences Corp.; IEE Transactions on Aerospace and Electronic Systems, Publication Date: Sep 1990; Volume: 26, Issue: 5; page(s): 748-753; ISSN: 0018-9251 https://svn.v2.nl/andres/Documentation/TDOA/Simple_Solutions_for_TDOA-fang.pdf |
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Ref. 27: Lissajous Figures, Jed Margolin, May 2001; http://www.jmargolin.com/mtest/LJfigs.htm |
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U.S. Patent 7,737,878 Collision and conflict avoidance system for autonomous unmanned air vehicles (UAVs) issued June 15, 2010 to van Tooren, et al. |
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U.S. Patent 5,036,330 Ranging system using correlation between two spread spectrum wave signals issued July 30, 1991 to Imae, et al. |
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U.S. Patent 5,955,553 Detection of spread spectrum signals issued September 21, 1999 to Houghton, et al. |
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U.S. Patent 6,031,485 Digital bi-static spread spectrum radar issued February 29, 2000 to Cellai, et al. |
References cited by Examiner
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U.S. Patent 3,171,126 Passive Detection and Ranging System issued Feb 23, 1965 to Wiley |
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U.S. Patent 3,812,493 Bistatic Passive Radar issued May 21, 1974 to Afendykiw et al. |
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U.S. Patent 3,943,514 Dual Base Line Interferometer Antenna issued March 9, 1976 to Afendykiw et al. |
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U.S. Patent 4,746,924 Apparatus and methods for locating a target utilizing signals generated from a non-cooperative source issued May 24, 1988 to Lightfoot |
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U.S. Patent 5,181,041 Accurate location system using transponded and correlated LORAN signals issued Jan 19, 1993 to Lind et al. |
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U.S. Patent 5,955,993 Detection of spread spectrum signals issued Sept 21, to Houghton et al. |
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U.S. Patent 6,148,041 Joint demodulation using spatial maximum likelihood issued Nov 14, 2000 to Dent |
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U.S. Patent 6,650,694 Correlator co-processor for CDMA RAKE receiver operations issued Nov 18, 2003 to Brown et al. |
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U.S. Patent 6,744,408 Enhancements for GPS based bi-static radar issued June 1, 2004 to Stockmaster |
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U.S. Patent 7,012,552 Civil aviation passive coherent location system and method issued March 14, 2006 to Baugh et al. |
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U.S. Patent 7,027,492 Wireless communication system with processor requested RAKE finger tasks issued April 11, 2006 to Bertrand et al. |
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U.S. Patent 7,138,944 Multiple antenna multi-frequency measurement system issued Nov 21, 2006 to Lawrence et al. |
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U.S. Patent 7,292,663 Efficient space-time adaptive processing (STAP) filter for global positioning system (GPS) receivers issued Nov 6, 2007 to Van Wechel et al. |
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U.S. Patent Publication 2009/0167607 Methods, apparatuses and systems for locating non-cooperative objects published July 2, 2009 (Holder) |
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U.S. Patent Publication 2010/0246547 Antenna selecting apparatus and method in wireless communications system published Sept 30, 2010 (Yoon) |