United States Patent 8,643,534

System For Sensing Aircraft and Other Objects

 

Application Number 13/594,815

 

Filed 8/25/2012

 

Issued 2/4/2014

 

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

February 4, 2014


When the Examiner required a restriction in the application that is now U.S. Patent 8,373,591 I chose the embodiment of the bistatic spread spectrum radar system using a satellite constellation or high flying aircraft.

I filed a divisional application for the embodiment using ADS-B as a radar, now issued as U.S. Patent 8,643,534 System for sensing aircraft and other objects issued February 4, 2014.

Both 8,373,591 and 8,643,534 are for sale.

Contact information


 

 

References


The listed links are the original links. In some cases they may be broken. The PDF version was made from the original link.

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. 17From 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 SystemsPublication 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. 27Lissajous 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 5,955,993 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.

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U.S. Patent 7,414,567 ADS-B radar system issued August 19, 2008 to Zhang, et al.

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References cited by Examiner

U.S. Patent Publication 2011/0140950 Validity check of Vehicle position information transmitted over a time-synchronized data link published June 16, Andersson

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EP 2136222 Validity check of Vehicle position information transmitted over a time-synchronized data link published December 23, 2009; Persson and Andersson

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