Use of Doppler Shift for the Directional Resolution of Received Signals1958 - 125 pages |
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achieved amplitude amplitude modulation antenna element antenna excitation antenna gate antenna pattern antenna rotation frequency azimuth balanced bandwidth beam switching tube block diagram California 1 Attn capacitor center frequency coil Commanding Officer components conventional array desired signal diode dipole direction finding directional array discussed Doppler array Doppler shift Electrical Engineering Electronics element spacing elevation angle f-m local oscillator filter frequency-modulated G₁ gating function gating pulse grid harmonics i-f output impedance instantaneous instantaneous phase Laboratory load low-pass filter magnetron magnetron beam switching mixer output modulation moving antenna mult multiple signals Naval Research noise figure np)t oscilloscope phase shift plate push-pull quency r-f amplifier r-f selectivity r-f stage received signal result shown in Fig sidebands spurious responses square wave summation tank Tektronix transmitter tuned circuit V₁ v₁(t voltage Washington 25 waveform wavelength ат