Inside GNSS Media & Research

NOV-DEC 2018

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16 InsideGNSS N O V E M B E R / D E C E M B E R 2 0 1 8 Michelle," Hegarty said. "And we sub- sequently had two children together, David, then Megan." But we are getting slightly ahead of ourselves. In 1997, armed with his new D.Sc., Hegarty was made Project Team Man- ager: Navigation and Surveillance Department, at MITRE's Center for Advanced Aviation System Develop- ment (CAASD) in McLean. is from the MITRE website: "With its unique laboratories, model- ing, simulation, and analytic capabili- ties, the CAASD has supported the Federal Aviation Administration's (FAA) mission for over 50 years. It is currently working closely with the Administration to develop NextGen – the next-generation air transportation system." If you are reading this, you probably already know how important that is. In 2002, Hegarty finally returned, with his family, to the state where he had grown up, having claimed a new position as Senior Principal Engineer: Communications, Navigation and Sur- veillance Division, at MITRE's CAASD facility in Bedford, Massachusetts, not far from his old Chelmsford stomping grounds. What He Did "I stumbled into the field of GPS," Hegarty admitted, "only because I had heard that Per Enge was a very good professor to do a M.S. thesis with. I can say I never expected to still be work- Professional Path Since receiving his Master's degree from the Worcester Polytechnic Institute, Dr. Christopher Hegarty has spent his entire professional career working for the same organization, the MITRE Corporation, mostly within the Center for Advanced Aviation System Development (CAASD), based in Virginia, and in his home state of Massachusetts. Since 1992 he has served in various positions from a member of the engineering staff to his current role as a Technical Fellow. Engineering Specialties Hegarty's B.S., M.S., and D.Sc. degrees are all in electrical engineering, with a focus on statistical communications theory and spread spectrum signal/receiver design. Other Technologies Hegarty works primarily on applications of satellite navigation for civil aviation, but has also worked on projects involving various other naviga- tion, communication, and surveillance systems. As chair of the RTCA Program Management Committee, which has oversight of all of the RTCA's Special Committees (SCs), he comes into contact with many other avia - tion technologies, including: integration of unmanned aircraft into civil airspace, GNSS, automatic dependent surveillance – broadcast (ADS-B), traffic alert and collision avoidance systems (TCAS/ACAS), aeronautical information and meteorological data link systems (AIS/MET), secondary surveillance radars (ATCRBS/Mode S), enhanced flight/synthetic vision systems (EFVS/SVS), data communication services (VHF, satellite, IP, and AeroMACS), aeronautical system and airport security, aeronautical databases, flight management systems (FMS), emergency locator trans - mitters (ELTs), airborne weather detection systems, and Wireless Avionics Intra-Communication Systems (WAIC). Engineering Mentor(s) Per Enge stands as one of the grand figures in the history of GNSS, and Hegarty had the good fortune to be associated with him as a young stu- dent. "Per was my first GPS mentor and truly an absolute pleasure to work for. I had the good fortune to work with him on various projects after he settled at Stanford." Hegarty also cites Dr. A.J. Van Dierendonck as an important figure in his academic and professional life. "A.J. has taught me a great deal of GNSS receiver design since I first met him in the early 1990s," he said. "I've been fortunate to be able to work with him on many projects over the last couple of decades." GNSS Event that Most Signified to You that GNSS had "Arrived" Hegarty knew that GNSS had become a true cultural phenomenon when he heard one of his kids singing the "Give a Give a Garmin" song one Christ- mas season after seeing the ad on television. What Popular Notions About GNSS Most Annoy You? One of Hegarty's pet peeves, he said, is with the usage of the term "GNSS": "I'm fond of the original definition of GNSS as the 'global collec- tion of all satellite navigation systems and their augmentations'. Recent- ly, a second definition of GNSS as 'any single global satellite navigation system' has come into favor, resulting in widespread confusion." As a Consumer, What GNSS Product, Application, or Engineering Innovation Would You Most Like to See? Hegarty would like to see the miniaturization of atomic inertial sensors that would allow mass-market devices using GNSS + inertial + other sen- sors to work satisfactorily in many areas where current devices do not today. Favorite Equation The Weiner-Khintchine equation: "First of all," Hegarty said, "it is just a Fourier transform, and one of my favorite undergraduate classes was on signals and systems where students were first taught that most time-domain waveforms can be decomposed as a summation of sinusoids. Second, it involves concepts in random processes, which is a topic I also enjoy and use a great deal in my work." Patents Held and/or Pending and When Achieved/filed for What Specific Applications/products/markets: Time-Multiplexed Binary Offset Carrier Signaling and Processing (US 2008/0260001A1 and 2010/0284440 A1). These two U.S. Patent Applica - tions were Expressly Abandoned by MITRE after publication to allow uni- versal free access to the inventions that are related to the generation and reception of the time-multiplexed binary offset carrier (TMBOC) modula - tion that was developed for the 4th civilian GPS signal, L1C. System and Method for Detecting GPS Anomalies (US 2014/998,837). This published patent application is for a method to protect GPS receivers from certain anomalies. Compass Points HUMAN ENGINEERING

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