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Radar Passif Aéroporté : Analyse de l’impact de la propagation sur le traitement des signaux DVB-T

Abstract : Passive radar detection benefits from non-cooperative telecommunication broadcasters, already existing in the environment, such as DVB-T broadcasters.It uses signal reflections over potential targets. An airborne receiver takes advantage of it as radar echoes.This new kind a detection system is discrete, has low energy consumption, uses already allocated frequencies and broaden radar detection to low altitudes.Due to airborne constraints, the standard signal processing steps, as the receiving system need to be adjusted.Indeed a dedicated radar has been developped in order to get experimental signal, and therefore help deepen the understanding of propagation phenomenon.The proposed reference signal estimation allows to face channel multipath induced fluctuations on the one hand, and to take into account channel time variationsthanks to Basis Expansion Model (BEM) modeling. A theoretical analysis of the clutter spread is then drawn.Experimental results confirm the expectation in the range-Doppler and angle-Doppler domain.Besides a clutter cartesian projection highlights the major reflectors, that may be confronted to the terrain truth.Reference signal estimation and clutter spread constitute two radar detection pilars, as these components have to be cancelled.So as to reject direct path, space filtering orthogonal to the direct direction is also performed to suppress the impact of the transmitted noise.Then reference signal is cancelled via a standard rejection method based on least-square filter coefficients estimation.The large Doppler and range clutter spread, lead us to reject the reference signal over shorter correlation periods.The present work gives an accurate comprehension of propagation mechanisms impact on airborne passive radar signal processing andprovides a promising perspective regarding intermediate radar cross section target detection.
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Submitted on : Wednesday, February 13, 2019 - 3:09:08 PM
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Clément Berthillot. Radar Passif Aéroporté : Analyse de l’impact de la propagation sur le traitement des signaux DVB-T. Traitement du signal et de l'image [eess.SP]. Université Paris Saclay (COmUE), 2018. Français. ⟨NNT : 2018SACLC103⟩. ⟨tel-02017997⟩

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