Abstract:This study investigates a communication-centric integrated sensing and communication system that utilizes orthogonal time-frequency space (OTFS) modulated signals emitted by low Earth orbit (LEO) satellites to estimate the initial-range, range-rate, and amplitude of point-like targets experiencing range migration under a first-order range model over the OTFS frame. Leveraging the signal samples produced by off-the-shelf OTFS demodulators, we derive the delay-Doppler-domain input-output relationship governing the target echo under both ideal and rectangular shaping filters. The target response exhibits a sparse structure in the delay-Doppler domain, whose support is determined by the target initial-range and range-rate. Exploiting this sparse model, we derive a lower-complexity approximation of the maximum-likelihood estimator for the target parameters. The proposed method first obtains coarse estimates of the target initial-range and range-rate using block orthogonal matching pursuit; then, a bank of matched filters focused on a smaller initial-range/range-rate region refines these two estimates and computes the amplitude estimate. The single-target procedure is extended to multiple targets via iterative estimation, reconstruction, and cancellation of dominant echoes. Finally, numerical examples are provided to evaluate the estimation performance.
From: Luca Venturino [view email]
[v1]
Thu, 3 Jul 2025 07:30:08 UTC (573 KB)
[v2]
Mon, 24 Nov 2025 17:28:58 UTC (573 KB)
[v3]
Tue, 12 May 2026 19:53:48 UTC (1,082 KB)
[v4]
Tue, 1 Sep 2026 23:17:38 UTC (1,499 KB)
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