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Army GPS-Doppler Hybrid Navigation System

机译：陆军Gps多普勒混合导航系统

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In accordance with the Department of the Army's approved Positioning and Navigation System (PANS) Materiel Need, the Army's 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 Pos/Nav/orientation 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 Pos/Nav 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 heading/attitude 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.

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