Patent ID: 7280071

Claim:
A satellite-signal reception-processing apparatus for receiving signals, which each have completed a spectrum-spreading process using a spreading code, from a plurality of artificial satellites, and computing a position and velocity of said satellite-signal reception-processing apparatus on the basis of said received signals, said satellite-signal reception-processing apparatus comprising: position-computation satellite determination means for carrying out an operation to search said artificial satellites for a set of specific artificial satellites each having its locus already known and a time of transmission of its spreading code also already known, a frequency of its carrier not being known as a stable frequency and designating said set found in said search operation as a set of position-computation artificial satellites to be used in computation of a position of said satellite-signal reception-processing apparatus; and velocity-computation satellite determination means for carrying out an operation to search said artificial satellites for a set of particular artificial satellites each having its locus already known and a frequency of its carrier determined to be a stable frequency, a time of transmission of its spreading code not known and designating said set found in said search operation as a set of velocity-computation artificial satellites to be used in computation of a velocity of said satellite-signal reception-processing apparatus.