AHRS400 Series User’s Manual
Doc# 7430-0004-01 Rev. A
Page 1
1 Introduction
1.1
The AHRS Series Motion and Attitude Sensing Units
This manual explains the use of the AHRS400 Series of products, nine-axis
measurement system designed to measure stabilized pitch, roll and yaw
angles in a dynamic environment.
The AHRS is a nine-axis measurement system that combines linear
accelerometers, rotational rate sensors, and magnetometers. The AHRS
uses the 3-axis accelerometer and 3-axis rate sensor to make a complete
measurement of the dynamics of your system. The addition of a 3-axis
magnetometer also allows the AHRS to make a true measurement of
magnetic heading.
The AHRS is the solid-state equivalent of a vertical gyro/artificial horizon
display combined with a directional gyro.
The AHRS series units are low power, fast turn on, reliable and accurate
solutions for a wide variety of stabilization and measurement applications.
All AHRS products have both an analog output and an RS-232 serial link.
Data may be requested via the serial link as a single polled measurement or
may be streamed continuously. The analog outputs are fully conditioned
and may be connected directly to an analog data acquisition device.
Crossbow Technology DMUs employ onboard digital processing to
compensate for deterministic error sources within the unit and to compute
attitude information. The DMUs accomplish these tasks with an analog to
digital converter and a high performance Digital Signal Processor.
The AHRS uses angular rate sensors and linear acceleration sensors that are
micro-machined devices. The three angular rate sensors consist of vibrating
ceramic plates that utilize the Coriolis force to output angular rate
independently of acceleration. The three MEMS accelerometers are surface
micro-machined silicon devices that use differential capacitance to sense
acceleration. Solid-state MEMS sensors make the AHRS both responsive
and reliable. The magnetic sensors are state-of-the-art miniature fluxgate
sensors. Fluxgate sensors make the AHRS sensitive and responsive, with
better temperature performance than other technologies such as magneto-
resistive sensors.
The AHRS400 Series of products utilize a sophisticated Kalman filter
algorithm to allow the unit to track orientation accurately through dynamic
maneuvers. The Kalman filter will automatically adjust for changing
dynamic conditions without any external user input. No user intervention
or configuration is required at power-up.
SUNSTAR传感与控制 http://www.sensor-ic.com/ TEL:0755-83376549 FAX:0755-83376182 E-MAIL:[email protected]
SUNSTAR自动化 http://www.sensor-ic.com/ TEL: 0755-83376489 FAX:0755-83376182 E-MAIL:[email protected]
