|Honeywell's Dead Reckoning Module (DRM™) 4000L is a miniature, electronic device for personnel on foot that provides the user’s position relative to an initialization point. Dead Reckoning (DR) data and external GPS NMEA data are blended by an internal Kalman filter. When GPS data is available the dead reckoning sensors are automatically calibrated continuously and the two data sources are blended into a composite real-time position data output. When GPS data is unavailable, dead reckoning takes over. DRM™4000L position error characteristics are independent of time, and depend primarily on distance traveled.
Patented motion classification algorithms (SmartPedometry™) analyze walking motion, and compensate when the user is running, or just “fidgeting” in place. Commercially available gyros are included to compensate for transient magnetic disturbances and transient accelerations that may interfere with compass operation. A barometric altimeter provides vertical position accurate enough to discriminate between floors of a building (1.5 meter accuracy). High fidelity azimuth, pitch, and roll data from the magnetic compass is also available for use by the host system.
The DRM™4000L unit can be directly interfaced to many GPS receivers and man-pack computers, and includes capabilities for accurate field calibration. The DRM™4000L is a reliable GPS supplement for personnel on foot. The unit is small enough to be easily integrated into torso-mounted devices, and does not require any sensors on the legs or feet. Applications for the DRM™4000L include personnel tracking (fire, police, and security), real-time waypoint navigation, disaster relief operations, and cell phone signal strength mapping.