June 2008 Meeting Summary

On June 25, 2008, the Southern California Chapter of the ION held a meeting, hosted by NavCom in Torrance, CA.  The meeting included a presentation from Dr. Chun Yang of NIST entitled Software GPS Receivers: Some Recent Developments and Trends.  A short biography and abstract of the meeting follows, and the slides used during the meeting are attached.

Brief  Resume of Dr. Chun Yang
Dr. Chun Yang has been with Sigtem Technology, Inc., since 1994 where he works on adaptive array and baseband signal processing for GNSS receivers and radar systems as well as on nonlinear state estimation with applications in target tracking, integrated inertial navigation, and information fusion. Dr. Yang is also an adjunct professor of Electrical and Computer Engineering at Miami University. He is the co-inventor of seven issued and pending U.S. patents. Dr. Yang received his Docteur en Science from Université de Paris-Sud, Orsay, France, in Sciences Physiques in 1989 and his Bachelor of Engineering from Northeastern University, Shenyang, China, in 1984. He is the co-author of an ION-GNSS best presentation paper and an ION AM/IEEE PLANS best track paper, and the co-recipient of ION Samuel M. Burka Award.

Abstract of Talk:
Slides: Software GPS Receivers: Some Recent Developments and Trends
More and more processing functionalities of a GPS receiver are implemented in software. Given this trend and with more capable and power-efficient processors over the horizon, a natural question to ask at this juncture is how to configure a software baseband processor, not just mimicking hardware-implemented functionalities, to best use of signals available.  This is particularly well-timed at the dawn of multi-constellation GNSS with a diversity of frequencies and codes.  This presentation will start with a brief review and then examine an exemplary state of the art software GPS receiver in detail.  It will focus on two recent developments.  One is a frequency-domain baseband processor that implements satellite signal channel impulse response vs. conventional correlation.  The other is on-line adaptive code replica synthesis, which can be used to suppress multipath and multi-access interference.  The presentation will end with some probing thoughts on standardization.