Accession Number : ADD011099

Title :   Direct Measurement of Earth's Vertical Deflection Using Global Positioning System.

Descriptive Note : Patent Application,


Personal Author(s) : Calabria,J A ; DeMatteo,J ; May,M ; Connolly,P E

Report Date : 30 Aug 1982

Pagination or Media Count : 22

Abstract : A shipboard system and associated technique are disclosed for measuring vertical deflection of the earth along the track of a survey ship using navigational information obtained from the space-based Global Positioning System (GPS). Continuously coded signals emanating from a plurality of GPS orbiting satellites are received on board the ship and processed to produce real-time data indicative of the ship's vertical position and velocity. The data is recorded and through post-mission processing thereof, smoothed estimates of the ship's vertical position are obtained. The vertical position estimates, representative of the earth's geoidal height along the course of the ship, are differentiated in accordance with a vertical deflection estimation algorithm, incorporating a Kalman smoothing filter, to obtain improved vertical deflection measurements along the track of the ship. (Author)

Descriptors :   *Patent applications, *Global positioning system, Geodetic surveys, Navigation satellites, Orbits, Kalman filtering, Ocean environments, Gravity anomalies

Subject Categories : Geodesy
      Unmanned Spacecraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE