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Session A3: Inertial Measurement Units

IMU-12 – More Performance in Small Size
Evgeny Zaitsev, Itzik Engel, Arnon Arbel, Al Cielo Inertial Solutions Ltd., Israel
Location: Big Sur
Alternate Number 2

A test case is presented demonstrating the flexibility of Closed Loop FOG technology.
Typical performance of tactical FOG- or RLG-based IMU is 1 °/hr bias repeatability and as low as 0.02 °/?hr ARW. These numbers are good enough for many in-flight and stabilization missions yet they leave room for improvement. One immediate short coming in the bias repeatability is a rising requirement to perform gyro-compassing, for which a better bias repeatability is required (at least 0.5 °/hr to enable 1° azimuth detection). Another growing requirement is lower ARW to allow better stabilization of gymballed platforms so observation and tracking performance can be improved.
We will demonstrate an improved Closed Loop FOG gyro capable of delivering overall bias error (composite error of day-to-day, in-run and over temperature errors) of 0.15 °/hr with ARW of 0.007 °/?hr. Further, and not less of importance, this gyro fits into existing tactical size systems already incorporated in customer’s applications allowing for immediate upgrade without any impact on the customer. The performance of several parameters will be discussed as well as the engineering means to achieve them demonstrating the advantage FOG scalability.



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