SBR sparse array performance with subarray orientation and timing errors

Coherent multiple aperture radars have been proposed for ground moving target indication to improve tracking accuracy and for along-track interferometry for detecting slow moving objects. An alternate architecture is indicated for detection of very slow moving targets. The approach that promises the most effective detection of slow moving targets is along-track interferometry (ATI). The Air Force Research Laboratory´s RLSTAP has been used to synthesize the clutter and target returns for a sparse space based radar array. This paper considers the limitations on along-track interferometry detection of moving targets, due to metrology on array orientation and coherency, and target motion. The effects of orientation between the two subarrays can be accommodated if accurate metrology and compensation are provided.