Fixed-row truncated Hankel smoothing plus continuous Newton refinement recovers single-snapshot DoAs near square-Hankel accuracy at linear cost in array size.
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Low-Complexity Gridless Single-Snapshot DoA Estimation via Truncated Hankel Newton-MUSIC
Fixed-row truncated Hankel smoothing plus continuous Newton refinement recovers single-snapshot DoAs near square-Hankel accuracy at linear cost in array size.