A simple, trivial example of STAP is shown in the first figure, for formula_4. This is an idealized example of a steering pattern, where the response of the array has been steered to the ideal target response, formula_5. Unfortunately, in practice, this is oversimplified, as the interference to be overcome by steering the nulls shown is not deterministic, but statistical in nature. This is what requires STAP to be an adaptive technique. Note that even in this idealized example, in general, we must steer over the 2-D angle-Doppler plane at discrete points to detect potential targets (moving the location of the 2-D sinc main lobe shown in the figure), and do so for each of the range bins in our system.