Research on software cache applied to the geometric correction of SAR images

In order to meet the requirement of heavy computation and hard real-time in SAR system, a software cache technique was designed for the geometric correction of SAR images. We studied the address mapping, pixel picking algorithm and cache replacement rule in line with the process feature of geometric correction. A result image pixel ergodic schemes was figured out for improving the cache hit probability. In addition, an algorithm was developed to figure out the most efficient cache line strategy adaptively. The software cache module was tested in two platforms, resulting in remarkable efficiency improvement of SAR geometric correction.