Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Method and apparatus for determining the position of a vehicle










Image Number 6 for United States Patent #4897661.

There is provided a system in which a transponder is carried by each vehicle traveling on or above the earth's surface which transmits a signal which is responsive to an interrogation signal to a ground station through two or more satellites and in the ground station, the position of the vehicle is determined from the propagation time differences of the response signals received via the satellites. In this system, the information indicative of the time lag which is required for the transponder to receive the interrogation signal and to transmit the response signal responsive to the interrogation signal is included in the response signal and then such response signal is transmitted. Thus, the time lag which is peculiar to each transponder and corresponds to the time required from the reception of the interrogation signal to the transmission of the response signal can be corrected. With this system, the positioning accuracy of each vehicle can be improved.








 
 
  Recently Added Patents
Method and system for routing telephony communications together with modified calling party identifier information
Methods and apparatus for ultrasonic cleaning
Electronic system auto-mute control circuit and control method thereof
Retransmission and retransmission request in data communication systems
Management of computer-file sharing between at least two devices
Load balancing in shortest-path-bridging networks
File management apparatus and file management apparatus controlling method
  Randomly Featured Patents
Hydrotherapy jet
Vehicle steering wheel power switch apparatus and method
Temperature compensated surface acoustic wave devices
Sample collector and components thereof
Systems and methods of identifying and manipulating objects
Zinc acrylate particle composition, method for production thereof, and golf ball using the composition
Pre-engineered electrode/dielectric composite film and related manufacturing process for multilayer ceramic chip capacitors
Method of producing a polyether copolymer
Tape drive sensor
System and method for analyzing a refrigerant sample