Positioning system for a vehicle
First Claim
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1. A system for measuring the position of an object comprising:
- receiving means for receiving navigational data radiated from a plurality of satellites and calculating position data and propagating delay time data based on the navigational data received from the plurality of satellites;
computing means, coupled to said receiving means, for calculating the position of the object when said receiving means receives navigational data from at least three satellites, based on the position data and the propagating delay time data calculated by the receiving means;
vector means for detecting the velocity and the angular velocity of the object and calculating a shifted vector amount caused by the displacement of the object during a predetermined time interval based on the detected velocity and the detected angular velocity of the object; and
compound computing means, coupled to said receiving means and said vector means, for calculating the position of the object when said receiving means receives data from at least one satellite but less than three satellites, based on the position data and the propagating delay time data calculated by the receiving means and the shifted vector amount calculated by the vector means.
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Abstract
An improved positioning system for a vehicle is shown. In the system, when radio wave can be received from only one satellite, the current position of the vehicle is computed based on a pair of navigational data, which are brought by radio wave received at the current time and by radio wave received at an earlier time.
117 Citations
8 Claims
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1. A system for measuring the position of an object comprising:
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receiving means for receiving navigational data radiated from a plurality of satellites and calculating position data and propagating delay time data based on the navigational data received from the plurality of satellites; computing means, coupled to said receiving means, for calculating the position of the object when said receiving means receives navigational data from at least three satellites, based on the position data and the propagating delay time data calculated by the receiving means; vector means for detecting the velocity and the angular velocity of the object and calculating a shifted vector amount caused by the displacement of the object during a predetermined time interval based on the detected velocity and the detected angular velocity of the object; and compound computing means, coupled to said receiving means and said vector means, for calculating the position of the object when said receiving means receives data from at least one satellite but less than three satellites, based on the position data and the propagating delay time data calculated by the receiving means and the shifted vector amount calculated by the vector means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification