NAVPAC (Navigation Package) is a space-qualified receiver instrument designed and developed by APL for the Defense Mapping Agency. The use of NAVPAC represents the first application of the Navy Navigation Satellite System to reconstruct accurately the orbit of another space vehicle. It also represents the first system for automatically providing a precise time-annotation capability for an event that occurs on a spacecraft. NAVPAC contains three dual-channel receivers to acquire and track signals automatically from as many as three Navy Navigation Satellites that are in view simultaneously. To help meet the program goals, NAVPAC also includes a three-axis minature electrostatic accelerometer. The goals of NAVPAC include accurately reconstructing a host-vehicle orbit, providing atmospheric density information, and improving the gravity field model. (Author)


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