As the ordinary low resolution radarcan not distinguish the radar target both at range andazimuth,if we apply the technology of inverse syn-thetic aperture radar (ISAR) to resolve the differenceamong Doppler frequency of the scatters on the tar-get,we can obtain a fine resolution cross-range image.The cross-range scale depends on both radar wave-length and rotating angle of target relative to radar-line-of-sight (RLOS) during the coherent accumula-tion.The former is known while the latter is difficultto determine especially in the case of ISAR.But wemust investigate the method of cross-range scaling oflow-resolution radar,as it is very important to radartarget classification and recognition.In this paper,anew approach is proposed which is based on the princi-ple of interferometric inverse synthetic aperture.Weapply the proposed algorithm to the emulational dataof two antennas.The processing results show that theproposed method is correct and effective.