ADJUSTABLE SELF-INTERFERENCE CANCELLATION IN AN FMCW RADAR ALTIMETER

摘要

Systems and methods for calibrating and optimizing frequency modulated continuous wave radar altimeters using adjustable self-interference cancellation are disclosed. In at least one embodiment, a radar altimeter system (100A, 100B, 100C) comprises: a local oscillator delay line (108) including a variable delay circuit (110, 110B, 110C) configured to output a delayed signal (124); a transmitter (102) coupled to the local oscillator delay line (108) and configured to output a transmitter signal (120A, 120B, 120C, 120D); a transceiver circulator (104) coupled to an antenna (112) and coupled to the transmitter (102), and a frequency mixer (106) coupled to the delay line (108) and coupled to the transceiver circulator (104). The transceiver circulator (104) directs the transmitter signal (120A) to the antenna (112), and the antenna (112) is configured to transmit the transmitter signal (120A) and receive a reflected signal (122) from a target (118). Further, the frequency mixer (106) is configured to receive the delayed signal (124) and the target reflected signal (122) from the transceiver circulator (104).