Gedex Systems Inc.

Published purpose

Inertial navigation is a technology that allows vehicles to determine how their position has changed over time, without needing to use outside resources (such as GPS). Currently, spacecraft operators must rely on external references such as radio tracking for navigation, but a method of autonomous navigation is highly desired for situations where ground-based communications are not possible. However, all current inertial navigation instruments suffer from an unavoidable drifting bias, causing a position error in the navigation solution which grows rapidly with time. The inaccuracy grows after a few hours to a level that is unacceptable for most space flight applications, especially for long-term exploration-class missions to other planets. Recently, Gedex developed a method using a pair of gimballed accelerometers that completely eliminates the drifting bias, slowing down the degradation of the navigation solution to the point where it can be useable for weeks or months. This revolutionary capability has immediate applications for asteroid exploration and long-duration, low-thrust space flight to other planets, and eventual applications for planetary rover exploration.