I will be presenting this DIY phased array radar system this week at the 2010 IEEE International Symposium on Phased Array Systems and Technology, in Waltham MA.
This is a near-field phased array radar capable of forming images in near-real-time at the rate of 0.5 Hz. In general, this shows what one might be capable of when you have limited resources and some time to think about working the problem. It was built in my garage and basement laboratory while in grad school as part of my dissertation.
If you are interested in this topic it will be presented on Wednesday, see the technical program for further details. (You can register at the conference if you have not done so already.)