Receiving device broadband autotransposición and application to the detection and characterization of radio emissions

摘要

Device (70) for receiving broadband, adapted for reception of radio emission center frequency F0 comprised in a frequency band BH, said device comprising at least: - two antennas (78, 79) identical very broadband high gain directives at least one plane, the two antennas pointing substantially in the same direction, producing each of the antennas from emissions captured radio signal S1 or S2; - a receive chain comprising two coherent local oscillators in phase respective frequencies F1 and F2 = F1 + FI above the maximum frequency BH band, performing said reception chain demodulating radio signals S1 and S2 in a signal at intermediate frequency; wherein the intermediate frequency signal is obtained in two steps: - initially demodulating the signal S1 or S2 signal by a signal obtained respectively by transposition frequency of the other signal, the S2 or S1 signal respectively, by means of the local oscillator frequency F1 and selecting the lower sideband spectrum obtained; meanwhile being filtered demodulated signal so obtained retain no more than the upper sideband spectrum obtained after demodulation; - transposing then to intermediate frequency FI, the signal obtained by demodulation of the signal S1 or S2 by the local oscillator frequency F2 = F1 + FI; signal being produced intermediate frequency centered on an intermediate frequency constant regardless of the center frequency F0 of the received signals.