Resources Contact Us Home
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
Software management system for network data processing systems
Method and system for determining an optimal missile intercept approach direction for correct remote sensor-to-seeker handover
Therapeutic rinse in a self-heating package
5-phenyl-pentanoic acid derivatives as matrix metalloproteinase inhibitors for the treatment of asthma and other diseases
Stain-blocking aqueous coating composition
Apparatus and method of managing radio bearer in wireless communication system
IC layout parsing for multiple masks
  Randomly Featured Patents
Semiconductor device and manufacturing method thereof
PMD insensitive direct-detection optical OFDM systems using self-polarization diversity
Umbrella with a light source and light refracting means
Methods of treating cancer with doxazolidine and prodrugs thereof
Sheet material transporting machine
Polyamide resin composition, and fibers, films and molded articles using the same
Chemical mode of operation of a water/steam cycle
Impact absorbing strut
Mute for brass musical instruments
Process for producing methacrylic acid