|Daniel F. Marshall
MIT Lincoln Laboratory
244 Wood Street
Lexington, MA 02173-9108
tel: (781) 981-0807
Abstract Research is ongoing into architectures for mitigating monostatic clutter interference and terrain-scattered jamming (TSJ) when both occur simultaneously. A difficulty which may arise in such architectures is that the process of mitigating the TSJ can spread the clutter energy off of its characteristic low-dimensional locus in the signal space. The consequences of this phenomenon are that target detection is impeded in those areas of the signal space to which clutter is spread, and that additional adaptive degrees of freedom are required to null the clutter. The latter occurrence has the potential to overwhelm the adaptive clutter nulling process, resulting in incomplete nulling of all of the clutter which is present. Different forms of clutter spreading have been predicted based on a number of hypothetical mechanisms. In this paper, a technique is developed for identifying such instances of clutter spreading in real data. Then, an example of clutter spreading in Mountaintop data after joint mitigation processing is given. This example is examined to identify the mechanisms responsible for it. The performance loss due to clutter spreading is compared for several joint mitigation architectures.
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