Per Enge

Per Enge is professor of aeronautics and astronautics at Stanford, where he directs the Stanford GPS Research Laboratory. He has a Ph.D. from the University of Illinois.

	Article Innovation: Digging into GPS Integrity November 1, 2011 By: Grace Xingxin Gao,Liang Heng,Per Enge,Todd Walter There are four important requirements of any navigation system: accuracy, availability, continuity, and integrity. In this month’s column we take a look at one particular aspect of GPS integrity: that of the signal in space and find out how trustworthy is the satellite ephemeris and clock...more >>
	Article Integrity for Non-Aviation Users July 1, 2011 By: Per Enge,Sam Pullen,Todd Walter Non-aviation users of satellite- and ground-based augmentation systems do not require the conservative level of integrity built into these systems for aviation users. Removing it can produce substantial benefits in terms of smaller error bounds and improved availability.
	Article GNSS Vulnerability and Alternative PNT July 1, 2010 By: Leo Eldredge,Mike Harrison,Mitch Narins,Per Enge,Randy Kenagy,Rick Niles,Robert Lilly,Robert Loh,Sherman Lo A group working under the auspices of the Federal Aviation Administration (FAA) Navigation Services Directorate recently prepared a study assessing non-GNSS navigation system architectures to provide alternate positioning, navigation, and timing (APNT) services for aviation users, to mitigate GNSS...more >>
	Article Future Augmented March 1, 2010 By: Juan Blanch,Per Enge,Todd Walter After reviewing current performance of WAAS, EGNOS, and MSAS, the authors present expected future performance, including the benefits of GPS L5. They evaluate the impact of the Indian GAGAN and Russian SDCM systems on global coverage and examine southward expansions for the original three SBASs....more >>
	Article Shaping Aviation Integrity April 1, 2008 By: Boris Pervan,Juan Blanch,Livio Gratton,Per Enge,Todd Walter Relative RAIM and absolute RAIM both enable an aircraft to raise a flag within seconds of receiving faulty data. This article evaluates the protection-level equations for both methods, and examines them in the light of GNSS constellations optimized for 24, 27, and 30 satellites.
	Article Security for Insecure Times November 1, 2007 By: Di Qiu,Per Enge,Sherman Lo Modernized Loran, hard to spoof and hard to jam, shows strong potential for securing sensitive data.
Article The End of the Beginning December 1, 2005 By: Per Enge The single greatest challenge for GPS this upcoming year is to accelerate the delivery of L5. The second greatest challenge is to foster the inertial and terrestrial radio technologies needed to usher in the golden age of navigation.