Hot Start

Hot-start functionality allows Certus to quickly start inertial navigation, and obtain a GNSS fix, as per specifications. The hot-start functionality is always on and fully automatic. See Navigation Specifications for details.

A battery system within Certus provides the hot-start ability for many hours without power. When Certus hot-starts, it assumes that it is in the same state it was when it lost power and begins navigating from that position. The hot-start also provides ephemeris, almanac and time information to the GNSS receiver which allows it to achieve a GNSS fix far more quickly than it otherwise could. When the GNSS achieves its first fix, Certus will jump to the new position without disturbing the filter.

Whenever Certus is without power it continues to accurately keep time so that it is immediately valid for a hot-start.

The hot-start functionality is of particular benefit to vehicle tracking and robotics applications. The primary benefits are immunity and fast recovery from power failure as well as fast start up time.