TILT MEASUREMENT SYSTEM (TMS)
The Tilt Measurement System (TMS) accurately measures two orthogonal tilts (such as Pitch and Roll) from one sensor (the Dual-axis Inclinometer), and single-axis tilt from one to three other sensors (Single-axis Inclinometers).
If these sensors are suitably placed, then the tilt of the rotation axis of a rotating system such as a tracker or a gun can be measured either with respect to a master datum (such as the reference surface for the Navigation System), or with respect to another rotation axis (such as another gun or tracker).
For example, this system can be used to measure the alignments of the various guns and trackers on a naval vessel.
Each tilt sensor uses one or two precision servo-ed accelerometers, allowing tilt to be measured to an accuracy of about 0.05 mrad (under static conditions, over a range of -30 to +30 degrees). The operating temperature of the accelerometers is stabilized (using temperature-controlled heaters) to reduce errors. Each sensor includes signal conditioning, conversion and processing electronics, to be able to provide the tilt in serial format, which allows long cables to be used, without excessively increasing measurement noise.
The tilt sensors are connected to an Inclinometer Interface Unit (IIU), which provides power to each tilt sensor and reads the tilt angles from the sensors. The IIU then processes the tilt data, to compute absolute and relative tilt. This data can then be passed to any system with a suitable serial interface. In the case of relative measurements where the sensors are correctly aligned, filtering in the IIU can be used to counteract mild base motion.
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