Long Term Orbit (LTO) with Assisted-GPS (A-GPS)
Long Term Orbit (LTO) technology brings GPS assistance data to mobile device users who do not have the benefit of Assisted-GPS (A-GPS) infrastructure in their wireless networks.
GPS-enabled mobile devices equipped with LTO deliver AGPS-enhanced performance without sacrificing the freedom of autonomous operation. GPS receivers typically need clear lines of sight to the satellites to download the orbit data (ephemeris) that is required for computing a position. The download process can take several minutes, and the data must be refreshed every two to four hours. This download cycle is cumbersome for mobile devices, where subscribers demand GPS fixes in seconds, not minutes.
- Shorter time-to-first-fix and better sensitivity than autonomous mode. Autonomous receivers often fail to compute a fix in indoor environments and urban canyons, where as the LTO-enhanced receiver continues generating the timely, accurate position fixes required for navigation and emergency services
- Enables A-GPS performance when operating out of network. After downloading LTO into a device, a wireless subscriber traveling outside of the home network will enjoy the accuracy and reliability of A-GPS performance for the full LTO validity period Airtime savings, reduced network traffic.
- Downloading LTO files requires a brief GPRS or docked Internet connection every few days. This saves considerable airtime, and contrasts sharply with A-GPS solutions in which data must be refreshed every two-to-four hours
- Location-based Services