Measuring and testing – Gravitational determination
Patent
1984-02-27
1985-11-05
Levy, Stewart J.
Measuring and testing
Gravitational determination
G01V 716
Patent
active
045506019
ABSTRACT:
An improved method that directly and continuously determines the magnitude f the earth's gravity in relation to a user platform at one or more selected points on or above the earth's surface. An improved Global Positioning System (GPS) is used to carry out the method and is made up of a plurality of twenty-four (24) continuously orbiting GPS satellites that are arranged into three groups of eight satellites with each group or constellation being disposed in its respective plane of a series of three longitudinal planes. Each plane is arranged in predetermined angular and spatial relation to the earth's equatorial plane and the other planes of the series. Any GPS satellite continuously transmits a pair of encoded RF signals at predetermined L-band frequencies. By virtue of this global arrangement of the 24 satellites, the antenna field of view of a user platform is capable of receiving at any time the encoded signals of at least six satellites. A geodetic receiver on the platform together with a receiver microprocessor, a navigation microprocessor, and a microcomputer progressively and continuously process signals received from the satellites for the ultimate purpose of comparing GPS dtermined vertical acceleration (that is normal to the earth's modeled ellipsoid) with its platform-measured gravimeter acceleration (that is normal to the earth's geoid) so as to determine, with greater accuracy, the gravity at one or more selected points. By reason of the improved GPS systems carrying out the method of continuously and directly determining gravity with greater accuracy at one or more points, a given area can be readily surveyed in relation to the user platform as well as enabling corrections to inertial navigation equipment and enhancing the guidance of weaponry (missiles, etc.) during firing or launch.
REFERENCES:
patent: 3803916 (1974-04-01), DeMatteo et al.
patent: 3888122 (1975-06-01), Black
patent: 4170776 (1979-10-01), MacDoran
patent: 4295372 (1981-10-01), DeMatteo et al.
patent: 4435981 (1984-03-01), Carson et al.
Beers R. F.
Branning A. L.
Chapman, Jr. John E.
Goshorn E. E.
Levy Stewart J.
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