Moog Crossbow GNAV540 - Manual (Page 18)

Page 18
GNAV540 User Manual
7430‐0808‐01 Rev. B
Measurement Accuracy
Attitude
Range: Roll, Pitch ±180°, ±90°
Accuracy <0.4°
A
ngular Rate Range: Roll, Pitch, Yaw ±200°
Bias Stability in run <10°/hr
emp <0.02°/sec Bias Stability over t
Acceleration Input Range ±4 g
Bias Stability in run <1 mg
Bias Stability over temp <4 mg
Signal Interface
The J1 port of the GNAV540 provides the connections listed in Table 6 below. Details of the signal interface,
including I/O pin out, is provided in Chapter 3. Hardware Interface on page 35.
Table 6 J1 Interface Connector
Connection Description
RS422 There are three serial interfaces (RS422):
• Mag : c
•
onnect to external Magnetometer
Connect to external GPS
omputer or host CPU
GPS:
• User: Connect to c
Ethernet Connect to user interface:
ult IP addre the unit The defa ss of : 192.168.1.2.
Power Input Labeled 12­30 VDC and Ground; connect to DC power source
Software Compatibility
Crossbow’s GNAV540 Inertial Systems are generally software compatible with the 440 series of Crossbow products.
The GNAV540 utilizes the 440 series extensible communication protocol, which is described in Chapter 9.
Communicating with the GNAV540 Unit.
GNAV540 Unit
The GNAV540 is Crossbow’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.
Summary of GNAV540 features: 6‐DOF IMU; 3‐Axis Internal Magnetometer; Dynamic Velocity; Dynamic Roll, Pitch
and Heading; GPS Receiver for Position.
• At the core of the GNAV540 unit is a rugged 6‐DOF (Degrees of Freedom) MEMS inertial sensor cluster.
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