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A User's Guide to a Computer Program for Harmonic Analysis of Data at Tidal Frequencies
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A Cross-coupling Computer for the Oceanographer's Askania Gravity Meter
A cross-coupling computer has been built for the NOAA ship Oceanographer's Askania GSS 2 gravity meter. Beam deflection and surge acceleration signals are obtained, respectively, from the gravity meter and its associated Anshutz gyro table. These are multiplied electronically and filtered to give computed cross-coupling error. Cross-coupling error is recorded on an analog recorder, and encoded for processing by the shipboard computer. Comparison of trackline crossings where significant cross coupling was recorded showed that the average crossing discrepancy was reduced from 14.5 milligals (mgal) to 2.5 mgal when corrected. On a traverse of the Cape Flattery gravity range, gravity error was reduced from an average of about 12 mgal to about 1 mgal by correcting for cross coupling.
Radiation Pressure on a Spheroidal Satellite
The pressure of solar radiation on a spherical balloon satellite is proportional to its cross-sectional area. However, there is evidence to indicate that the PAGEOS satellite has not remained spherical, but is more nearly a prolate spheriod that is rotating about its minor axis. If this is true, the force of solar radiation incident upon its surface must be expressed in terms of the shape of the surface and its orientation to the sun. Furthermore, radiation reflected from the surface of an aspherical balloon will impart an additional force which can be large enough to significantly perturb the orbit. By starting with basic equations for the radiation forces on a flat plate and integrating over the sunlit portion of the surface, exact expressions are obtained for both the incident and reflected radiation forces on a stationary, prolate spheroidal satellite. These expressions are then used to develop power series expansions for the radiation forces on a rotating spheroid.
Pacific SEAMAP 1961-70 Data for Area 15530-10, Longitude 155 ̊W to 165 ̊W, Latitude 30 ̊N to 36 ̊N
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The Reduction of Photographic Plate Measurements for Satellite Triangulation
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