I'm working on some research with a professor, and we're looking at data collected by an x-band radar array looking at ocean waves as they approach the coast (the radar is on land, and we can see about 3 miles out). What we're trying to do is perform an fft on the signal using Matlab, and then manually increment the fft in time to see if we can inverse it and get back an image similar to one taken by the radar at a different time. We gave it a shot but the inverse transform quickly went to garbage as our delta_t's got bigger. Small delta_t's gave back an image that looked more like the original image but everything was sortof blurred. I can provide some of the code, but does anyone have any general advice on how to do this or know of any resources/examples to check out? I'm posting the question here because I think that what we're after is an answer to a physics/math question. But perhaps this is better addressed to the programming community..? Thanks!