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Army GPS-Doppler Hybrid Navigation System,
ARMY AVIONICS RESEARCH AND DEVELOPMENT ACTIVITY FORT MONMOUTH NJ
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In accordance with the Department of the Armys approved Positioning and Navigation System PANS Materiel Need, the Armys stated objective is to field a mix of externally referenced Positioning Subsystems, self-contained subsystems, and hybrid systems to allow for determination of heading, azimuth, and range for navigation and present position. The intent is to avoid losing completely PosNavorientation capability for critical missions through dependence by the Army upon any one Nav system in the field. More specifically, the fiscal 1980 Scientific and Technical Objectives Guide defines the need to provide superior accuracy and reliable navigation continuity over the battlefield under all visibility, terrain, and weather conditions for such missions as Aerial Scout Helicopter and Advanced Attack Helicopter. To satisfy these requirements, the Army is developing a family of advanced externally referenced and self-contained PosNav systems and the techniques to hybrid these to satisfy mission requirements at lowest cost. One of these, the Doppler navigator or, ASN-128, is a fully self-contained, EW Secure, sophisticated, dead-reckoning system. However due to residual headingattitude and velocity errors, its position accuracy degrades as a function of distance traveled. Therefore, mission aircraft which require high accuracy at all times must use a form of position-updated doppler navigator.
APPROVED FOR PUBLIC RELEASE