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
Vehicle speed verification system and method
Driving apparatus having an optical sensor and a thermal sensor for thermal and aging compensation of backlight module and driving method of backlight module
Method for manufacturing a magnet coil configuration using a slit band-shaped conductor
Dual work function recessed access device and methods of forming
Accessing a base station
Pharmaceutical powder compositions
Real-time RSL monitoring in a web-based application
  Randomly Featured Patents
Storage system
Fabrication of foil disc pressing matrices
Heterocyclic compounds and thrombopoietin receptor activators
Control valve
Display frame
Herbicidal sulfonamides
Four-layered striated tealight candle
Antioxidant combinations for use in feed rations to increase milk production and milk fat
Capacitor ignition system