An Efficient Method of Self-Generated Assistance Data for Fast-Fix Applications

摘要

In this paper, we will introduce a practical solutionwith integrating many advanced features, includingAlwaysLocate?, EASY?, HotStill?, and EPO?,which are called as SElf-Generated Assistance-data(SEGA) technologies into high sensitivity & low powerGNSS chipsets. SEGA’s capabilities are expanded tomore general applications like the snapshot-fixingsystems, trigger start services, and many LBSrequirements. Practically, SEGA can be adopted onGNSS-capable mobile devices to perform a fast time-tofirst-fix without network connection. In previous work[1], the fundamentals of the SEGA method weredescribed and all subsystems were also discussed indetail. The algorithm’s performance was quantified inTTFF and sensitivity experiments on a GNSS-capablephone. The experimental result has proven that the SEGAtechnology can significantly help the sensitivity andprovide AGPS-like TTFF performance without an AGPSconnection. The satellite signal acquisition sensitivity willbe improved to -160dBm and power consumption is only3 mW in average. Having this system, end users canobtain accurate “always-on position” with minimal powerconsumption. These new technologies will accelerate therealization of positioning everywhere and help uscommunicate in a seamless fashion.