A signal and its non-uniform rotation distribution can in principle be recovered from the first two moments of noisy SO(2)-aligned observations, using frequency marching or a spectral eigenvector method.
Estimation under group actions: recovering orbits from invariants,
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Provable algorithms for multi-reference alignment over $\SO(2)$
A signal and its non-uniform rotation distribution can in principle be recovered from the first two moments of noisy SO(2)-aligned observations, using frequency marching or a spectral eigenvector method.