Accession Number:

ADD012961

Title:

Method for Determining the Orientation of a Moving Platform.

Descriptive Note:

Patent,

Corporate Author:

DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s):

Report Date:

1986-07-08

Pagination or Media Count:

10.0

Abstract:

This patent discloses an improved method for continuously determining the orientation of a moving user platform at a selected time fix. A Global Positioning System GPS is used to carry out the method and is made up of a plurality of twenty four 24 earth-orbiting satellites wherein each satellite continuously transmits a pair of distinctively encoded RF signals. The GPS system is also provided with a computerized GPS receiver apparatus for use on a moving platform. The receiver apparatus is generally comprised of a rotatable antenna, a single channel multi-track geodetic receiver, a receiver microprocessor, and an orientation computer with a display. The receiver processor selects an optimum group of four satellites to be tracked. The orientation computer during antenna rotation selects a series of four equidistant points about the antenna perihery for receiving signals from each tracked satellite. The signals are transformed by the computer so as to provide a graphic data display output in near real time of the biased range Doppler phase measurement of each optimum-tracked satellite in relation to the moving platform.

Subject Categories:

  • Navigation and Guidance

Distribution Statement:

APPROVED FOR PUBLIC RELEASE