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UM001
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3
VN-100 Software Architecture
The software architecture internal to the VN-100 includes four separate subsystems. These subsystems
are the IMU, the NavState, the NavFilter, and the Communication Interface. The high-level functions
performed by these subsystems are outlined below. This chapter describes these functions performed by
these subsystems in more detail and describes which of the various measurement outputs originate from
each of these corresponding subsystems.
VN-100 Software Architecture
3.1
IMU Subsystem
The IMU subsystem runs at the highest system rate, described from this point forward as the IMU Rate
(defaults to 800 Hz). It is responsible for collecting the raw IMU measurements, applying a factory, user,
and dynamic calibration to these measurements, and optionally filtering the individual sensor
measurements for output. The coning and sculling integrals also are calculated by the IMU subsystem at
the full IMU Rate. The IMU subsystem is also responsible for time stamping the IMU measurements to
internal system time, and relative to the SyncIn signal.
IMU
Downsamples
IMU sensors to
800 Hz
Applies Factory
Calibration
Applies User
Calibration
Applies User
Reference
Frame Rotation
Applies User
Low-Pass
Filtering
Applies Onboard
Calibration
Timestamps
Measurements
NavState
Calculates
orientation at
400Hz
Computes delta
angles
Computes delta
velocity
NavFilter
Vector
Processing
Engine
AHRS Kalman
Filter
Hard/Soft Iron
Estimator
World Magnetic
Model
World Gravity
Model
Comm
Interface
Serial ASCII
Serial Binary
SPI
Serial Command
Prompt
Содержание VN-100
Страница 1: ...UM001 1 Firmware v2 1 0 0 Document Revision 2 22 VN 100 User Manual Embedded Navigation Solutions...
Страница 9: ...UM001 9 2 Specifications 2 1 VN 100 Surface Mount Sensor SMD Electrical Pin assignments top down view...
Страница 14: ...14 UM001 2 3 VN 100 Surface Mount Sensor SMD Dimensions Measurements are in inches 2 4 VN 100 Rugged Dimensions...
Страница 102: ...102 UM001 8 3 Factory Defaults Settings Name Default Factory Value Magnetometer Calibration Control 1 3 5...
Страница 113: ...UM001 113 9 5 Factory Defaults Settings Name Default Factory Value Velocity Compensation Control 1 0 1 0 01...