For over ten years, Al Cielo Inertial Solutions (ACIS) has been supplying Israeli and international customers with high-performance, reliable inertial solutions based on closed-loop FOGs. This technology has been proven over the past few decades as a growing number of IMU systems based on FOG technology have been successfully deployed. FOG systems are found in tactical and in strategic IMUs, providing a range of solutions for navigation and control. IMUs, as well as systems-gyroscopes-only inertial reference units (IRUs), are also used for high-precision attitude referencing. This chapter is most, but not exclusively, relevant to this application.
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