ELECTRONIC RECONNAISSANCE SYSTEMS FOR MILITARY USE ON LAND, SEA, AND AIR, ELECTRONIC WARFARE COUNTER MEASURE SYSTEM, ELECTRONIC SEISMIC SYSTEM FOR MILITARY AND NON-MILITARY GEOLOGICAL EXPLORATION, AND ELECTRONIC CALIBRATION SYSTEM FOR MILITARY AND NON-MILITARY APPLICATIONS, COMPRISING SOME OR ALL THE FOLLOWING, NAMELY, DIRECTION FINDING (DF) SUBSYSTEMS FOR PROVIDING PRECISE INFORMATION ON THE DIRECTION OF INCOMING SIGNALS, INSTANTANEOUS FREQUENCY MEASUREMENT (IFM) SUBSYSTEMS FOR SIMULTANEOUSLY SURVEILLING AND MEASURING THE FREQUENCIES OF ALL RADAR PULSES IN A BROAD SPECTRUM, SIGNAL PROCESSORS FOR PROCESSING DATA FROM RADAR SIGNALS, DISPLAY SUBSYSTEMS FOR TRANSFORMING THE DATA INTO USEFUL FORMS, COUNTER MEASURES FOR DISRUPTING OR MANIPULATING, AS WELL AS RECEIVING AND PROCESSING, SIGNALS, DIGITAL SIGNAL PROCESSORS, DISPLAYS, SPECTRUM ANALYZERS, RECEIVERS, DEMODULATORS, BANDWIDTH COMPRESSORS, SIGNAL DIGITIZERS, SIGNAL SIMULATORS, SIGNAL SELECTORS, WAVEFORM GENERATORS, WAVEFORM MODULATORS, DISCRIMINATORS, INTERFACE UNITS, DIGITAL FILTERS, ANTENNAS, TUNERS, VIDEO PROCESSING UNITS, DELAY LINES, QUANTIZERS, LOGIC BUFFER UNITS, NOISE COMPENSATORS, AMPLIFIERS, CHANNEL CORRELATORS, MULTIPLEXERS, DEMULTIPLEXERS, MONITORS, RADIOS, ANGLE GATING UNITS, SEISMIC ACCELERATOR UNITS, SEISMIC RECORDER UNITS, RECORDER PLAYBACK UNITS, GEOGRAPHICAL FIELD COMPUTERS, ELECTRONIC COUNTER/FREQUENCY CALIBRATORS, AND ATTENUATION AND POWER METER CALIBRATORS