1.An Imaging Radar forms a picture of the observed object or area. Imaging radars have been used to map the Earth, other planets, asteroids, other celestial objects and to categorize targets for military systems.
Typically implementations of a Non-Imaging Radar system are speed gauges and radar altimeters. These are also called scatterometers since they measure the scattering properties of the object or region being observed. Non-Imaging Secondary Radar applications are immobilizer systems in some recent private cars.
2.For the Second part of your question about funtioning.... you better go this link may be it will help u out.
http://www.crim.ca/perso/langis.gagnon/articles/spie97pf.pdf
For an overview on RADAR Remote Sensing see: Fundamentals on Remote Sensing (CCRS), section 3.1:
http://www.nrcan.gc.ca/earth-sciences/geomatics/satellite-imagery-air-photos/satellite-imagery-products/educational-resources/9309
For more information , read this IEEE Paper "Image Processing Models, Methods and Means in Radio Systems" and "PROSPECTS OF NEW REAL-TIME RADAR APPLICATIONS FOR ENVIRONMENTAL REMOTE SENSING"
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