A TCAS receiver/transmitter which uses an improved calibration scheme for improving the ability of the device to transmit in a narrow directional field where the device uses the transmitter frequency source to generate signals for calibration purposes. The calibration uses a technique of simultaneously...http://www.google.fr/patents/US6285313?utm_source=gb-gplus-shareBrevet US6285313 - TCAS transmitter phase tuning system and method
