Taken from the MOD website:
ASTOR - the Air-borne STand-Off Radar - is a ground surveillance system designed to provide information regarding the deployment and movement of enemy forces. It will use state-of-the-art radar technology to obtain high resolution imagery of static features and can also identify and track moving vehicles. Imagery gathered will be transmitted in near-real-time to a network of distributed Ground Stations deployed with front-line forces. Images can be displayed and analysed within the Ground Stations, ensuring that tactical commanders are aware of the latest developments on the ground. It will be a vital force multiplier in the modern conflict where speed of battle is such that up-to-date information is crucial if troops are to be deployed effectively.
With the Sythetic Aperture Radar, you don't just get MTI dots moving on a scope (a la J-STARS in Desert Storm) but you get a high-res radar image, which can be used as a stand-alone source or cross-cued with other assets. It should be quite good, really!
SBG