Electronic null-seeking goniometer for ADF

摘要: In an electronic null-seeking goniometer for use in automatic direction finding equipment a microprocessor is used to generate sine and cosine information response the detected phase of bearing signal. The iteratively locates transmitter null cardioid pattern orthogonal loop sense antennas (115) (116), without rotating either antenna set or goniometer. This eliminates requirement moving components. entirely devoid any machinery. A feedback signal (127) functionally related angle provides stable location method, audio distortion, at relatively high feedback/signal ratios. generates signals (113 114) which are supplied respectively multipliers (110, 111) multiply signals. outputs subtracted (117) resultant difference zero when found. shifted (110), modulated (119), added (122) output (121), result (123), (125) filtered (129) provide error (130) drives iterative process microprocessor.