Positioning system for a vehicle
Hybrid navigation system for determining a relative position and direction of a vehicle and method therefor Patent #: 4743913
ApplicationNo. 738505 filed on 08/01/1991
US Classes:342/357.15Satellite selection (i.e., tracking or acquisition)
ExaminersPrimary: Blum, Theodore M.
Attorney, Agent or Firm
International ClassesH04B 007/85
Foreign Application Priority Data1989-01-26 JP
AbstractAn apparatus and method for navigating a vehicle using GPS (Global Positioning System) are disclosed in which a plurality of GPS antennae are installed on a plurality of positions, e.g., front and rear ends or left and right sides of the vehicle. A direction sensor for detecting a forward direction of the vehicle is installed. Also, a satellite arrangement calculating block for determining satellites from which electromagnetic waves can be received through the respective antennae on the basis of; orbit data on the satellites, the mounting arrangement of the GPS antennae, and the forward direction of the vehicle is included. A receive satellite selecting block for selecting the satellites required to calculate position from among the available satellites from which each GPS antennae can receive electromagnetic waves is installed, so that the receive satellites is previously determined, differently from a diversity method, so speedy and accurate measurement of the present position of the vehicle can be made.