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Temporal Convolutional Autoencoder for Interference Mitig...
[Submitted on 28 May 2025 (v1), last revised 8 Aug 2026 (this ve · 2025-05-29 · via cs.LG updates on arXiv.org

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Abstract:Reliable altitude estimation with frequency-modulated continuous wave (FMCW) radar altimeters is increasingly a challenge due to in-band interference from modern communication systems. In this paper, we present a temporal convolutional autoencoder (TCAE) that directly processes in-phase and quadrature (IQ) samples to suppress structured interference while preserving signal phase and frequency content for range estimation. The model is trained and initially evaluated within a full radar altimeter simulation chain, then further validated via over-the-air (OTA) experiments using a universal software radio peripheral (USRP)-based testbed. Results show that the TCAE reduces altitude estimation error by more than 85% compared to least mean squares (LMS) adaptive filtering under severe interference conditions, including low signal-to-interference-plus-noise ratio (SINR) and full temporal overlap between interfering and radar signals. Unlike conventional methods, the TCAE maintains phase fidelity and beat structure, enabling accurate range estimation even when interferers occupy more than one-quarter of the radar bandwidth. The implemented TCAE performs mitigation directly on fixed-length IQ windows using a single feed-forward pass and was integrated into the MATLAB/ONNX-based evaluation chain used for both simulation and OTA testing. These findings demonstrate that learned IQ-domain interference mitigation can enhance radar-altimeter resilience under a range of tested interference conditions.

Submission history

From: Charles E Thornton [view email]
[v1] Wed, 28 May 2025 18:52:10 UTC (16,051 KB)
[v2] Fri, 26 Jun 2026 14:42:11 UTC (12,229 KB)
[v3] Sat, 8 Aug 2026 14:24:51 UTC (12,229 KB)