Bistatic imaging
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Bistatic imaging is a technique for using two radar instruments to map a surface, with one emitting and one receiving. The result is a more detailed image than would have been rendered with just one radar instrument. Bistatic imaging can be useful in differentiating between ice and rock on the surface of the moon, due to the different ways that radar reflects off of these objects—with ice, the radar instruments would detect "volume scattering", and with rock, the more traditional surface scattering would be detected.
