Patent ID: 6762715
Filing Date: 2004-07-13
Classification: G01S

Abstract:
A positioning receiver comprising:phase confirmation means for receiving a signal from each of at least five satellites, locus information of each of which has been received, and confirming the phase of a diffusion code in a condition where said locus information has been obtained from each of said satellites as well as an approximate present time and an approximate position of a receiver is already known; and coordinate calculation means for establishing at least five simultaneous equations for said at least five satellites respectively to represent a relation between the positions of each of said satellites as well as said receiver and a time required by said diffusion code to arrive at said receiver, and solving said at least five simultaneous equations in order to calculate 3-dimensional coordinates of said receiver, wherein: said at least five simultaneous equations include five unknown quantities, namely, a reference time, an error of a clock for measuring a diffusion-code reception time for each of said satellites and said 3-dimensional coordinates of said receiver; said diffusion code is transmitted from each of said satellites at a diffusion-code transmission time expressed as a sum of a time having a value represented by digits expressing a number equal to or greater than one unitary time corresponding to one period of said diffusion code and a time having a value represented by digits expressing a number smaller than said unitary time; and said time represented by said digits expressing a number equal to or greater than said unitary time is represented by a sum of said reference time which is common to all said satellites and a differential time which varies from satellite to satellite.