Networked differential GPS system

An embodiment of the present invention relates to a worldwide network of differential GPS reference stations (NDGPS) that continually track the entire GPS satellite constellation and provide interpolations of reference station corrections tailored for particular user locations between the reference stations Each reference station takes real-time ionospheric measurements with codeless cross-correlating dual-frequency carrier GPS receivers and computes real-time orbit ephemerides independently. An absolute pseudorange correction (PRC) is defined for each satellite as a function of a particular user's location. A map of the function is constructed, with iso-PRC contours. The network measures the PRCs at a few points, so-called reference stations and constructs an iso-PRC map for each satellite. Corrections are interpolated for each user's site on a subscription basis. The data bandwidths are kept to a minimum by transmitting information that cannot be obtained directly by the user and by updating information by classes and according to how quickly each class of data goes stale given the realities of the GPS system. Sub-decimeter-level kinematic accuracy over a given area is accomplished by establishing a mini-fiducial network

Derivation of Aerospace Antenna Coupling-Factor Interference Prediction Techniques

http://deepblue.lib.umich.edu/bitstream/2027.42/21267/2/rl2142.0001.001.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/21267/1/rl2142.0001.001.tx

NAVSTAR GPS Simulation and Analysis Program (Final Report)

This study assesses the capability of the planned NAVSTAR Global Positioning System (GPS) to meet civil navigation requirements

Derivation of aerospace antenna coupling-factor interference prediction techniques : interim report

http://deepblue.lib.umich.edu/bitstream/2027.42/6410/5/bad0635.0001.001.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/6410/4/bad0635.0001.001.tx

Derivation of Aerospace Antenna Coupling - Factor Interference Prediction Techniques

http://deepblue.lib.umich.edu/bitstream/2027.42/21244/2/rl2119.0001.001.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/21244/1/rl2119.0001.001.tx