Device for motion error compensation for a radar with synthetic aperture based on rotating antennas (ROSAR) for helicopters

A device for motion error compensation of a synthetic aperture radar based on a rotating antenna of a helicopter and flight guidance, the device comprising:

• transmitting and receiving antennas arranged on a rotating arm for transmitting successive transmitted pulses and for receiving reflected said transmitted pulses as received signals;
• correlation means for correlating said received signals with preset reference functions;
• correction means for correcting motion and curvature errors;
• demodulation means for demodulating raw data;
• A/D converter for digitizing data from said demodulation means;
• a pulse compression means for pulse compression of data from said A/D, said pulse compression means transforming data by means of an FFT;
• index shifting means for receiving data from said pulse compression means and for shifting a time gate of the data received from said pulse compression means;
• first interpolation means for receiving data from said index shifting means and cooperating with said index shifting means for fine shifting of said time gate;
• scaler multiplication means for receiving data from said interpolation means and for compensating variations in amplitude;
• memory means for receiving and storing data from said scaler multiplication means;
• second interpolation means for receiving data from said Corner Turn means;
• said correlation means receiving data from said second interpolation means;
• third interpolation means for receiving data from said correlation means, said second interpolation means, said correlation means and said third interpolation means compensating for a data shift caused by a tangential velocity component;
• detection means for receiving complex data from said third interpolation means and for converting said complex data into real amplitude data;
• a memory and a monitor for receiving data from said third interpolation component.