DMU380SA Series
User’s Manual
________________________________________________________________________
Doc# 7430-0026 Rev. 01
Page 2
Overview of the DMU380SA Series Inertial Systems
1.2
This manual provides a comprehensive introduction to the use of MEMSIC
’s
DMU380SA Series Inertial System products listed in Table 2. This manual is intended to
be used as a detailed technical reference and operating guide for the DMU380SA Series.
MEMSIC
’s
DMU380SA Series products combine the latest in high-performance
commercial MEMS (Micro-electromechanical Systems) sensors and digital signal
processing techniques to provide a small, cost-effective alternative to existing IMU
systems and mechanical gyros.
Table 2.
DMU380SA Series Feature Description
Product
Features
IMU380SA
6- DOF Digital IMU
VG380SA (-200,-400)
6-DOF IMU, plus Roll and Pitch
AHRS380SA (-200, -400) 9-DOF IMU (3-Axis Internal Magnetometer) plus Roll, Pitch, and Heading Standard Range, High
Range
INS380SA (-200, -400)
9-DOF IMU (3-Axis Internal Magnetometer) and Internal WAAS Capable GPS Receiver plus
Position, Velocity, Roll, Pitch, and Heading Standard Range, High Range
The DMU380SA Series is MEMSIC
’s
fourth generation of MEMS-based Inertial
Systems, building on over a decade of field experience, and encompassing thousands of
deployed units and millions of operational hours in a wide range of land, marine,
airborne, and instrumentation applications.
At the core of the DMU380SA Series is a rugged 6-DOF (Degrees of Freedom) MEMS
inertial sensor cluster that is common across all members of the DMU380SA Series. The
6-DOF MEMS inertial sensor cluster includes three axes of MEMS angular rate sensing
and three axes of MEMS linear acceleration sensing. These sensors are based on rugged,
field proven silicon bulk micromachining technology. Each sensor within the cluster is
individually factory calibrated for temperature and non-linearity effects during
MEMSIC
’s manufacturing and test process using
automated thermal chambers and rate
tables.
Coupled to the 6-DOF MEMS inertial sensor cluster is a high performance
microprocessor that utilizes the inertial sensor measurements to accurately compute
navigation information including attitude, heading, and linear velocity thru dynamic
maneuvers (actual measurements are a function of the DMU380SA Series product as
shown in Table 2). In addition, the ARM processor makes use of internal and external
magnetic sensor and/or GPS data to aid the performance of the inertial algorithms and
help correct long term drift and estimate errors from the inertial sensors and
computations. The navigation algorithm utilizes a multi-state configurable Extended
Kalman Filter (EKF) to correct for drift errors and estimate sensor bias values.
Another unique feature of the DMU380SA Series is the extensive field configurability of
the units. This field configurability allows the DMU380SA Series of Inertial Systems to
satisfy a wide range of applications and performance requirements with a single mass
produced hardware platform. The basic configurability includes parameters such as baud
rate, packet type, and update rate, and the advanced configurability includes the defining
of custom axes and how the sensor feedback is utilized in the Kalman filter during the
navigation process.
The DMU380SA Series is packaged in a fully sealed lightweight housing which provides
EMI, vibration, and moisture resistance to levels consistent with most land, marine, and
airborne environments. The DMU380SA Series utilizes an RS-232 serial link for data
communication, and each data transmission includes a BIT (Built-In-Test) message
