Engineering topics
Publications and source records attributed to Bar-Sever, Y..
We describe the development, demonstration, and applications of the NASA Global Differential GPS (GDGPS) system, an effort that is funded under the Advanced Information Systems Technology (AIST) Program.
In this paper we present results for CHAMP POD using the precise GPS measurements collected by the BlackJack receiver through the up-looking antenna. We will describe the quality of the tracking data, the tuning of the reduced-dynamic model for the 400-km orbit, and the various methods of evaluating the orbit accuracy.
Presentation in three parts. Part 1: GPS capabilites in JPL's tracking systems and applications section: Introduction. Part 2: JPL's GPS Receiver Technology. Part 3: JPL's relevant expertise in GPS performance analysis and software.
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The BlackJack family of GPS receivers has been developed at JPL to satisfy NASA's requirements for high-accuracy, dual-frequency, Y-codeless GPS receivers for NASA's Earth science missions. In this paper we will present the challenges that were overcome to meet this accuracy requirement. We will discuss the various reduced dynamic strategies, Space Shuttle dynamic models, and our tests for accuracy that included a military Y-code dual-frequency receiver (MAGR).
Precise real-time, onboard knowledge of a platform s state (position and velocity) is a critical compponent in many marine applications. This article describes a recent technology development that provides a breakthrough in this capability for platforms carrying a dual-frequency GPS receiver - seamless global coverage and roughly an order of magnitude improvement in accuracy compared to state-of-the-art.
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Indirect observations of Eurpoa suggest that the Jovian satellite may have a liquid ocean underneath its ice surface.
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Mars has become the focus of an unprecedented series of missions spanning many years, involving numerous nations and evolving from robotics to humans.
NASA's Jet Propulsion Laboratory has intiated the design of a spacecraft constellation that will provide communication relay and navigation support for a variety of future Mars missions.
Data from terrestrial GPS receivers are being used in growing numbers of applications requiring precise tropospheric sensing. One emerging application is the calibration of water vapor measurements from spaceborne microwave radiometers.