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Abstract

Measurement of orientation of a mobile in space, for example the heading of a ship with the aid of receivers of satellite-based radio positioning signals. To obtain a measurement of orientation very rapidly, use is made of two reception antennas located at two points A and B whose distance D is known. First, n successive calculations of position of the point A with respect to the point B (for example a dozen successive calculations if the distance D is 40 centimeters) are performed based on a single set of 2p pseudo-distances measured between each antenna and p satellites. The n calculations correspond to n initial estimated positions serving as starting assumptions for the calculation. The n estimated positions are situated on a circle with center B and radius D. The calculated positions are situated at distances from the point B. A position is selected representing a true position of the point A while verifying that this position is on the circle with center B and radius D to within a few millimeters. The selection may possibly be improved by verifying the consistency of the measurement.

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First Claim