Overview
GPStream™ PGPS is an Assisted-GNSS solution designed to substantially enhance the satellite acquisition performance of virtually any GNSS positioning engine, whether a chipset or next-generation software-GNSS. In practical terms, this means a reduction of Time-To-First-Fix from 45 seconds to 2 seconds or less. Moreover, fixes can be achieved in difficult environments where they were previously impossible.
PGPS works on any mainstream mobile operating system as well as proprietary embedded platforms, and can seamlessly adjust its performance if the device has full, occasional, or no network access at all. PGPS consists of a lightweight and patented software client that enables the device to generate its own GNSS assistance data, i.e. extended ephemeris. Extended ephemeris is a close approximation of the real broadcast ephemeris constantly transmitted by the satellites, which must normally be received by the device before it can start calculating its position.
PGPS preloads extended ephemeris data into the GNSS chipset, thereby avoiding the latency and higher bandwidth usage inherent in real-time Assisted-GNSS approaches. The net result is super fast satellite acquisition and improved GNSS sensitivity. In other words, a better user experience when consuming Location-Based Services.
