An improved approach of cross-range scaling in ISAR

We have developed an approach of ISAR cross-range scaling. The fundamental principle is that we can estimate the rotating angle of target relative to radar-line-of-sight (RLOS) during the total coherent processing interval via the tomographic formation. However, the multi-dimensional search involved in the estimation of rotating angle will result in huge computational load. In this paper, an improved approach of cross-range scaling in ISAR is presented which takes the place of tomographic formation with the extended coherent processing and modifies the criterion to search the rotating angle. The processing results of computer simulated data and real data of model B-52 collected in a microwave anechoic chamber show that the improved approach is able to carry out the cross-range scaling of ISAR accurately. As compared with the previous method, its computational complexity is greatly reduced.