Patent Document ID: 4672382
Application ID: 06804512
Patent Flag: 1

Claim One:
1. A position measuring system for a vehicle comprising: means for detecting navigational data by receiving radio waves emitted by satellites; switching means having a change-over switch connected to said detecting means; first computing means connected to the change-over switch for computing initial estimated values of the vehicle's position on the basis of the navigational data when said change-over switch is in a first position; memory means for storing the initial estimated values calculated in the first computing means; and second computing means connected to said change-over switch and said memory means for convergently computing the true position of the vehicle based on the initial estimated values and the navigational data when said change-over switch is in a second position, wherein said first position indicates that the initial estimated values have not been stored in said memory means and said second position indicates that the initial estimated values have been stored in said memory means.