Advanced Technologies for Security Applications by Unknown

Author:Unknown
Language: eng
Format: epub
ISBN: 9789402420210
Publisher: Springer Netherlands

In the CU section dedicated to the received signals, there is another 3:1 coupler collecting the optical signals coming from the RXs of the three SPs, on three different wavelengths. After an EDFA, another AWG splits the three signals at the input of three photodetectors (PD) for the opto-electrical (O/E) conversion of the radar waveform to base band (BB). The PD outputs, after signal conditioning, are separately digitized by three analog-to-digital converters (ADCs). The SOLE photonic MIMO radar demonstrator will operate on S and X band. Transmission and reception orthogonality between the SPs will be obtained thanks to time division multiplexing (TDM), i.e. each SP will transmit and receive in different moments. The coordination in time of the SPs operations is achieved thanks to the gate signals.

The scheme of the structure of a sensor peripheral is shown in Fig. 14.1b. The three optical signal coming from the CU are again separated by an AWG. The radar waveform is photodetected by a PD with a broad electrical BW. Then, among all the beating products at the output, the one centered at the desired RF frequencies in X and S band are selected by suitable electrical filters inside the front-end, before amplification and transmission by a wide-band antenna. The received radar echoes gathered by the antenna are fed into the electrical input of a MZM and E/O converted, modulating the mode coming from the MLL. An automatic polarization controller keeps the polarization of the incoming MLL mode aligned with the input polarization axis of the MZM, to optimize the power losses. The MZM output is transmitted on the SMF to the CU, where it is received and acquired.

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