Moog Crossbow VG700MB Series - Manual (Page 7)

VG700M User’s Manual
Doc.# 7430-0280-01 Rev. F Page 1
1
Introduction
1.1 The DMU™ Series Motion and Attitude Sensing Units
This manual explains the use of the VG700M Series of products.
The VG700M is a six-axis dynamic measurement unit (DMU) designed to
measure linear acceleration along three orthogonal axes and rotation rates
around three orthogonal axes. It uses three accelerometers and three
angular rate sensors to make a complete measurement of the dynamics of
your system.
In addition, it is designed to provide stabilized pitch and roll in dynamic
environments. The VG700M is the solid state equivalent of a vertical
gyro/artificial horizon display. The VG700MB-206 also includes a relative
heading output based upon yaw gyro information.
The DMU series products are low power, fast turn on, reliable and accurate
solutions for a wide variety of stabilization and measurement applications.
The VG700M product has an RS-422 serial link. Data may be requested via
the serial link as a single measurement or streamed continuously.
The Crossbow DMUs employ on board digital processing to provide
application-specific outputs and to compensate for deterministic error
sources within the unit. The DMUs accomplish these tasks with an analog
to digital converter and a high performance Digital Signal Processor.
The VG700M uses three micro electro-mechanical machined (MEMS)
accelerometers and three fiber optic gyro (FOG) angular rate sensors. The
three MEMS accelerometers are surface micro-machined silicon devices
that use differential capacitance to sense acceleration. These solid state
MEMS sensors are responsive and reliable. The FOG rate sensors provide
angular rate measurements that are more accurate and subject to less drift
than the silicon based rate sensors.