sar image formation algorithm based on stretch processing

the range imaging based on conventional pulse compression technique requires lfm signal that sampled by nyquist rate. in order to high resolution increased in range in pulse compression, so the lfm bandwidth has to increase. consequently this procedure dictated limitations on adc sampling. the stretch processing is one of techniques decreasing nyquist rate in radars. in this method the nature of transmitted lfm signal differ from new signal, because all process steps for imaging formation are investigated repeatedly. in this paper besides introducing stretch processing technique that used in radars, the amount of decreased sampling rate is calculated. in following, a suitable rda image formation algorithm based on stretch processing for high squint angle is proposed. finally, an innovative method is presented for rcmc without interpolation methods.