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
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.
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. 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. 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. 8: Test Results from a Novel Passive
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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. 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,
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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. 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. 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 5,955,993 Detection of spread spectrum signals issued September 21, 1999 to Houghton, et al. |
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References cited by Examiner
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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 |