Resources Contact Us Home
Self calibration of transponder apparatus

Image Number 2 for United States Patent #6529156.

A method and apparatus is provided for remotely and constantly calibrating a transponder by using the ring around phenomenon. A number of different time varying physical quantities, such as for example temperature, signal level, noise, transmission line flex, frequency, and general operational effects, affect the inherent delay in transponders on a time varying basis. The invention relies on a the ring around phenomenon to produce pulse doublets, wherein the distance between the pulses in the pulse doublets correspond to the instantaneous delay in the transponder. The system is configured so that instantaneous variation in the transmission delay is detected and recognized on a pulse by pulse basis and transmitted to the interrogation device, which then functions to calculate the actual delay. Normal operation of the transponder is not affected by the continuous calibration method, and therefore a special calibration mode is not required.

  Recently Added Patents
Plants and seeds of hybrid corn variety CH514730
Data storage apparatus, memory control apparatus and method for controlling flash memories
Under bump passive components in wafer level packaging
Randomly accessible visual information recording medium and recording method, and reproducing device and reproducing method
Video reproducing apparatus and video reproducing method
Linear transformer power supply
Method and apparatus for providing seamless call handoff between networks that use dissimilar transmission methods
  Randomly Featured Patents
Process and apparatus for extruding a low density elastomeric thermoplastic foam
Continuous fish feeding system
Method and system for providing access to computer resources that utilize distinct protocols for receiving security information and providing access based on received security information
Modular walkway system
Vertical deflection control circuit and television receiver using such vertical deflection control circuit
Hand rail for recreational vehicle
System and method for flow/pressure boosting in a subsea environment
Optical glass for precision molding
Bicycle brake with detachable slave cylinder