IFF/ADS-B reception chain

A reception chain configured to allow the reception of IFF signals received in a frequency band centred on the 1030 MHz frequency and of ADS-B signals received in a frequency band centred on the 1090 MHz frequency, and to reject at least a frequency band comprised between the 1030 MHz frequency and the 1090 MHz frequency, wherein it comprises:

• a reception antenna configured to receive a radiofrequency signal in a frequency band comprising the 1030 MHz and 1090 MHz frequencies,
• an analog part with:
• a two-band filtering device configured to filter the radiofrequency signal acquired on the reception antenna by allowing passage around the frequency bands of the IFF and ADS-B signals while rejecting said frequency band comprised between the 1030 MHz frequency and the 1090 MHz frequency,
• a low-noise amplifier configured to amplify the radiofrequency signal filtered by said two-band filtering device,
• a mixer configured to mix the signal amplified by the low-noise amplifier with a sinusoidal signal so as to transpose the signals received on the frequency bands of the IFF and ADS-B signals to lower frequency bands,
• an analog-digital converter configured to digitize the signals received on said lower frequency bands,
• a digital part configured to duplicate the digitized signal, and to process the duplicated signals respectively on:
• a first path comprising a first filtering device and a first frequency transposition device, configured to filter and transpose to a working frequency the signals received around the frequency bands corresponding to the IFF signals transposed by said mixer, and further comprising IFF signal processing means,
• a second path comprising a second filtering device and a second frequency transposition device configured to filter and transpose to a working frequency the signals received around the frequency bands corresponding to the ADS-B signals transposed by said mixer, and further comprising ADS-B signal processing means.