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 apparatus for closed-loop control of anti-tachyarrhythmia pacing using hemodynamic sensor
Fuse part in semiconductor device and method for forming the same
Combination therapy to enhance NK cell mediated cytotoxicity
Blended block copolymer composition
Image heating apparatus
Receiver with feedback continuous-time delta-sigma modulator with current-mode input
Method, apparatus and computer program product for providing metadata entry
  Randomly Featured Patents
Method and apparatus for metallization of large area substrates
High-frequency loud speaker
Typing guide
Fastener
Lightweight ceramic insulation and method
Fade compensated tone control method and apparatus
Automatic generation of voice content for a voice response system
Method and apparatus for load sharing on a wide area network
Two tier server
Power driven hair clipper