A-GPS and SiRFInstantFixII™ SGEE/CGEE
For Cameras, Gaming, Handsets and PNDs
Description
SiRFInstantFixII satellite prediction technology greaty improves start-up times for any location-centric device—with or without internet accessibility. Less than 10 seconds start-ups are made possible by employing a small Extended Ephemeris file, either acquired via the internet or calculated on the device, far outlasting a standard broadcast ephemeris by three to seven days. SiRFInstantFixII is supported on most SiRFstar chips and on the SiRFprima SoC.
Key features
- Dramatically reduced Time to First Fix in most environments
- Increased autonomous acquisition sensitivity
- Robust starts and continuous navigation in urban canyons
- Continuous connectivity not required
- No constant downloading
- Download supported through any connectivity type
- Extended Ephemeris (EE) file valid up to seven days
- Seamless operation between EE file and broadcast ephemeris
Benefits
SiRFInstantFixII provides exceptional start-up times with or without connectivity.
With connectivity
- Speedy start-ups are made possible via an internet connection that eliminates the need to download a satellite ephemeris, allowing a SiRF receiver to be instantly navigating in almost any environment
- The key to this solution is a sophisticated set of proprietary algorithms that calculate an Extended Ephemeris (EE) file, yielding an accurate fix long after a traditional broadcast ephemeris has timed out—about four hours—and provide navigable positions for up to seven days
Without connectivity
- Fast start-ups are made possible with one observation of each satellite, accurately predicting satellite positions for up to three days—removing the need to download satellite ephemeris data at subsequent start-ups
- SiRFInstantFixII software resides on the host processor of SiRFstar-based PNDs, and can run as a low priority background task. On SiRFprima, SiRFInstantFixII software resides on the SoC
Download the CSR InstantFix Extended Ephemeris (EE) and A-GPS PDF
Product details
Time To First Fix
- <10s
Horizontal Accuracy for Client Functionality
- Day 1 <7m
- Day 2 <18m
- Day 3 <28m
Server Functionality Accuracy
- Day 1 -2 <10m
- Day 3 - 4 <20m
- Day 5 - 7 <40m
Memory
- Data segment 216 KB (RAM)
- Read-only segment 48 KB (ROM)
- Text segment 176 KB (ROM)
Memory Requirements on Supported Protocols
- SiRFstarIII chips SiRF Binary, NMEA
- CSR SoCs NMEAes a day
Subject to approval, a datasheet can be made available for this product via CSR Support.