Moog Crossbow GNAV540 - Manual (Page 16)

age 16 GNAV540 User Manual
7430‐0808‐01 Rev. B
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Glossary
Table 4 Glossary
Term Definition
6DOF Six Degree of Freedom
ACL Accelerometer
AHRS Attitude Heading Reference
BIT Built In Test
DSP Digital Signal Processor
ECEF Earth‐Centered Earth‐Fixed
ESS Environmental Stress Screening
EKF Extended Kalman Filter
FIR Finite Impulse Response
GB‐GRAM Ground‐Based GPS Receiver Application Module
GPS Global Positioning System
Hard failure Fatal condition, non‐operational
Hard iron Magnetism is retained (permanent)
IMU Inertial Measurement Unit
LLA Latitude Longitude and Altitude
LSB Least Significant Byte
MEMS Micro‐Electro‐Mechanical Systems
MSB Most Significant Byte
MTBF Mean Time Between Failure
PPS Precise Positioning Service
QTP Qualification Test Plan
SAASM Selective Availability / Anti‐Spoofing Module
SDGPS Satellite Differential GPS
Soft error Persistent error, repeated many times within a period of time
Soft iron Magnetism is not retain
magnetic field ed; magnetism only occurs while the material exposed to a
VDC Voltage Direct Current
VG Vertical Gyroscope
WAAS Wide Area Augmentation System: enhanced accuracy of GPS positioning