Microlocal Analysis of Multistatic Radar Imaging

We consider the synthetic aperture radar experiment in which waves, simultaneously emitted from a pair of stationary emitters, are scattered by objects and measured by a receiver that makes multiple passes over the scattering region. In such problems, the possibility for passive, background signals to be recorded during a radar experiment and corrupt the image is often neglected. Our work addresses this by considering the two emitters to be ‘always on’ so there is the potential for ‘crosstalk’ between their signals. Closely related is the problem of passive imaging, where one wishes to produce a high-quality image purely from background signals, for which our analysis is also applicable.We use a single-scattering model for the radar data recorded from two emitters and assume that the data cannot be separated. Backprojection of the data leads to artifacts and we determine their positions in the image relative to the scatterers that produced them. We develop two methods that mitigate these artifacts; a technique utilising a carefully designed data acquisition geometry and an image processing technique that displaces artifacts away from a region of interest (ROI). We describe the necessary conditions for these methods to be applicable and discuss their limitations.