Showing papers on "Inertial reference unit published in 1968"

A non-orthogonal multi-sensor strapdown inertial reference unit.

Abstract: Nonorthogonal multisensor strapdown inertial reference unit providing redundant capabilities and optimal performance

Design approach for reducing gyro-induced errors in strapdown inertial systems.

Abstract: Single degree of freedom integrating gyro in strapdown inertial systems, discussing error reduction

Design of a precision tilt and rotational vibration isolation system for inertial sensor testing.

Abstract: Precision tilt and rotational isolation system design for inertial navigation sensor testing

What an Inertial Navigator Consists of

Abstract: Mr. J.G. Carr and Sq.-Leader D. Scott, R.A.F., have devoted sections two, three and four of a total of 21, and a few other remarks here and there in their excellent paper, ‘The testing of airborne inertial navigation systems’ ( Journal , 20, 405), to the above title as an exposition ‘first necessary’ to their main purpose, limiting themselves to ‘the types of system of which we have practical experience’. They do not otherwise identify these types explicitly, but do include them among the ‘many ways of mechanizing this concept', viz., ‘The feature which is common to all inertial navigators is the measurement of acceleration of the vehicle by measuring [and in effect they add also “or metering”] the force required to constrain a proof-mass carried in the vehicle to move with it,’ and from this deducing velocity and position of the vehicle. This statement seems well put to me and quite sound, but in the fourth paragraph of Section 4, which includes ‘Fig. 1. A Schuler tuned inertial navigator’, they imply that at least their types, if not all inertial navigators, are based also on ‘Schuler tuning [so named] after the discoverer of the principle', and here I do not follow them. (I note in passing that the by-line of Schuler's 1923 paper, Physik. Zeitschr . XXIV, 344–50, spells his name without the umlaut used consistently by them.)

Inertial reference apparatus

Abstract: An inertial reference unit for navigation and control systems comprising gimballed platforms carrying inertial measurement instruments. Upper and lower platforms are disposed in stacked relation within a cylindrical inner roll gimbal. The upper platform, which is rotatable relative to the gimbal is stabilized in azimuth by a closed-loop torque system. The lower platform depends from the upper platform and is rotated relative thereto at a uniform angular rate.