A device for receiving a wide band by autotransposition and a detection and the characterization of emissions radio

摘要

The device according to the invention is based on the use of an antenna formed of two antennas which pick up the transmissions presented and produce two radio signals s1 and s2. These two signals are used to produce at least one signal at intermediate frequency fi by demodulation of one of the two signals with the other (autotransposition). The demodulation is carried out by translating a of the signals s1, for example, about a frequency f1, the signal s2 is kept around its central frequency f of the initial. Thus, regardless of the central frequency f of the emission picked up by the antennas, the demodulation produces a signal of the central frequency f is then demodulated in the intermediate frequency fi is given by means of a local oscillator of a constant frequency f1 + f2 = fl. The device according to the invention is applied to the embodiment of a detection device and to the characterization of broadcasts.