美国高通公司GPSone技术材料

Improved Accuracy
Quick search of only the visible satellites generally leads to more detected satellites and better accuracy
Increased SFra Baidu biblioteknsitivity
Reduced time and freq search space
Lower Power
Shorter TTFF means the receiver stays on as short as needed to get a fix
Improved Yield
Reduced search space and delivered ephemeris means it is more likely to find enough acceptable satellites to make a position fix
(Data demodulation no possible on some satellites)
~ 100%
Accuracy – CEP 68%
(Moderate indoor environment)
~ 20 to 40 meters GPS Engine ON for ~2 sec Phone on for ~3 sec
The gpsOne Advantage
Integration — No separate GPS baseband or RF chip, dramatically reducing external components resulting in more-efficient board space High level of integration and tight NW synchronization enables sensitivity and TTFF (time-to-first-fix) performance optimization High level of integration to deliver the lowest cost GPS solution availabl Multiple modes supported: - MS-Assisted, MS-Based A-GNSS, - Hybrid w/ AFLT and WiFi Positioning, - Standalone GPS and gpsOneXTRA Assistance Multiple Operating Systems supported - Brew/Brew MP, Android, Windows Mobile, Symbian, etc.
Benefits of Assisted-GPS vs. Standalone GPS
A-GPS Always Delivers Superior Performance vs. Standalone GPS
Metric
Open Sky TTFF Sensitivity Session Yield
(Moderate indoor environment)
Standalone GPS
~ 35 seconds ~ -145 dBm
Limited by GPS data demodulation
Assisted-GPS
~ 2-3 sec
~ -161 dBm
~ 10% to 30% ~ 40 to 80 meters
Power
GPS Engine ON for ~ 35 sec
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QUALCOMM CONFIDENTIAL AND PROPRIETARY
gpsOne allows China Telecom to Deploy the Most Cost-Effective, Performance Optimized, and Versatile Solution Available Today!
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Lower Cost
Reduced search space means less correlators are needed to search the same space, in a fixed period of time
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QUALCOMM CONFIDENTIAL AND PROPRIETARY
Benefits of Assisted-GPS
A-GPS Delivers Most Reliable and Most Rapid Location-Based Services for Subscribers
Reduced Time-To-First-Fix (TTFF)
No need to decode satellite Ephemeris and clock corrections