October 2012 Meeting Summary

Donald Leimer spoke to the Southern California Section on Thursday, October 25, 2012 at John Deere. Mr. Leimer’s talk is SiRFusion™ There were about 40 in attendance. A brief bio and abstract of the talk follows. His presentation is attached.

Abstract of Mr. Leimer’s Talk: SiRFusion™ (Presentation Slides)
GPS receivers are found on nearly every smart phone today enabling a wide range of location-based services such as mapping, search, and navigation. Users expect their devices to work in all environments including indoors, parking garages, and in dense urban canyons. Recent advancements in Assisted-GPS technology have enabled improved positioning indoors, but GNSS receivers are still not sensitive enough to determine position everywhere that users carry their devices. Any solution to improving coverage and accuracy indoors must be low cost and low power.

This talk introduces a new product from CSR Technology, Inc. – SiRFusion™ based on the SiRFstarV™ location chips. This ground-breaking receiver combines the latest A-GPS and A-GLONASS advancements with Wi-Fi positioning and dead reckoning using low-cost Micro-Electro-Mechanical Systems (MEMS) sensors. Smart phones are equipped with an increasing array of MEMS sensors including accelerometers, magnetometers, gyroscopes, and barometers. The SiRFstarV chip acts as a gateway to receive input from all available MEMS sensors so that the output signals can be combined with the GPS, GLONASS, and Wi-Fi measurements. The observations from all of these sources are fused together using a Kalman Filter. Smart location management is employed to make use of the best combination of sensors at any given time in order to maximize coverage and accuracy while keeping power draw to a minimum. The result is continuous position availability in indoor environments.

To achieve these results, the system also uses data from a server for A-GPS, A-GLONASS, extended ephemeris data, and Wi-Fi positioning data. The improved coverage and accuracy indoors allows the system to crowd source the location of Wi-Fi access points indoors to a better level of accuracy than previously possible without surveying the sites. This in turn allows devices even without MEMS sensors to perform better than previously possible indoors.

Capsule Biography of Donald Leimer
Don Leimer is Vice President of Advanced Development for CSR Technology. He is currently leading new GNSS and location technology development for consumer GNSS products. He has been a major contributor to the development of two generations of SiRFstar GNSS and related wireless chips at SiRF Technology, now a part of CSR Technology. Mr. Leimer has over 40 years experience in wireless communications and GPS projects, including the GPS Phase I military program at Magnavox Advanced Products & Systems Division.