172285 ⎘
Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using radio waves; Systems for determining direction or deviation from predetermined direction using amplitude comparison of signals derived sequentially from receiving antennas or antenna systems having differently-oriented directivity characteristics or from an antenna system having periodically-varied orientation of directivity characteristic derived from different combinations of signals from separate antennas, e.g. comparing sum with difference
Sub-classes:ANTENNA SYSTEMS AND METHODS FOR TRACKING NON-GEOSYNCHRONOUS SATELLITES
#2SYSTEM AND METHOD FOR DETERMINING DIRECTION OF A RADIO FREQUENCY SIGNAL
#3ANTENNA SYSTEMS AND METHODS FOR TRACKING NON-GEOSYNCHRONOUS SATELLITES
#43D angle of arrival capability in electronic devices with adaptability via memory augmentation
#5High confidence isolated presence detection in fine resolution region
#6Device including antenna and control method thereof
#7Direction finding system device and method
#8Directional antenna module and method
#9Direction of arrival determination for a radio signal
#10Angle-resolving radar sensor
#11Antenna arrangement for DOA estimation
#12Method and system for signal processing by modulation of an optical signal with a multichannel radio frequency signal
#13Systems and methods for determining a rotational position of an object
#14Method and apparatus for detecting EM energy using surface plasmon polaritons
#15Monopulse antenna tracking and direction finding of multiple sources
#16Phased array antenna beam tracking with difference patterns
#17Systems and methods for tracking power modulation
#18Systems and methods for tracking power modulation
#19Phase difference of arrival geolocation