Research Article

Multipole Theory and Algorithms for Target Support Estimation

Figure 7

Illustration of the minimum convex source region corresponding to the minimum source region in Figure 6. The radiated field can be estimated everywhere outside , and this information can be used subsequently to estimate the critical radius of the largest sphere up to which the known radiated field can be backpropagated, which establishes a boundary for the minimum source region . The geometry of this backpropagation pierces or intersects concave portions of , allowing the extraction of the pending nonconvex support information of that is not contained in .
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