172275 ⎘
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; Details Means for reducing polarisation errors, e.g. by use of Adcock or spaced loop antenna systems
Sub-classes:METHOD OF ESTIMATING A DIRECTION OF ARRIVAL OF AN ELECTROMAGNETIC WAVE AT AN ANTENNA ARRAY
#2Antenna array with selectable horizontal, vertical or circular polarization
#3RANGEFINDER FOR TARGETING DEVICE AND METHOD OF ALIGNING RANGEFINDER TO TARGETING DEVICE
#4Method of automatic target angle tracking by monopulse radar under conditions of interference distorting location characteristic
#5Rangefinder for shooting device and method of aligning rangefinder to shooting device sight
#6True azimuth and north finding method and system