LTO-AGPS - Long Term Orbits (LTO) with Assisted-GPS (AGPS)

Long Term Orbits (LTO) with Assisted-GPS (AGPS)

Broadcom's patented Long Term Orbits (LTO)
technology brings GPS assistance data to
mobile device users who do not have the benefit
of Assisted-GPS (AGPS) 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 (TTFF) 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 AGPS 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 AGPS 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 AGPS solutions in which data must be refreshed every two to four hours