Triply Redundant Integrated Navigation and Asset Visibility System
A quartz time, positioning, and navigation array that solves a fundamental
sensitivity problem is under development by ORNL researchers. Existing systems
with good timing stability are limited by poor motion sensitivities. In contrast, this
invention has stability at a much lower size, weight, and power; better acceleration
and shock tolerance; wider temperature tolerance; and very high reliability.
The invention, called ORIENT (Orthogonally Referenced Integrated Ensemble for
Navigation and Timing), is a part of ORNL’s TRI•NAV™, a personnel/asset location
system that combines inertial navigation, military-quality GPS, and robust widearea
radio frequency location. ORIENT uses an integrated group of quartz-crystal
timing oscillators that are tightly matched and compensated for temperature,
shock/acceleration effects, and long term drift. The system can provide short term
timing performance that is superior to higher power quartz or atomic clocks; yet, it
can be calibrated long term via GPS. It is also more rugged and power efficient than
other clocks while maintaining comparable levels of stability.
Since the quartz array concept demands excellent timekeeping in changing
environments, a very small change in frequency, or gamma, is required.
Unfortunately, a small quartz gamma yields a low-sensitivity acceleration sensor,
which is a huge drawback for a useful device. ORIENT’s configuration incorporates
a second set of crystal-driven oscillators for sensing with much higher gammas to
solve this difficulty.
Highly stable performance in dynamic environments
Higher sensitivity and responsiveness to motion
Robust and reliable
Position, navigation, and timing systems for government, military, commercial, industrial, Homeland Security, vehicular, asset tracking, and consumer use
Rough terrain, urban settlements, and areas covered by dense foliage
Stephen Fulton Smith and James Anthony Moore. Orthogonally Referenced Integrated Ensemble for Navigation and Timing, U.S. Patent Application 13/083,366, filed April 8, 2011.
Inventor Point of Contact
Stephen Fulton Smith
Measurement Science and Systems
Oak Ridge National Laboratory
|Title and Abstract||
Orthogonally referenced integrated ensemble for navigation and timing
An orthogonally referenced integrated ensemble for navigation and timing includes a dual-polyhedral oscillator array, including an outer sensing array of oscillators and an inner clock array of oscillators situated inside the outer sensing array. The outer sensing array includes a first pair of sensing oscillators situated along a first axis of the outer sensing array, a second pair of sensing oscillators situated along a second axis of the outer sensing array, and a third pair of sensing oscillators situated along a third axis of the outer sensing array. The inner clock array of oscillators includes a first pair of clock oscillators situated along a first axis of the inner clock array, a second pair of clock oscillators situated along a second axis of the inner clock array, and a third pair of clock oscillators situated along a third axis of the inner clock array.
|Oak Ridge National Laboratory||02/26/2013
|Technology ID||Development Stage||Availability||Published||Last Updated|