用於聯合通訊與遙測基於正交時頻空調變 之合成孔徑雷達成像系統;An OTFS-based Synthetic Aperture Radar Imaging System for Joint Communication and Remote Sensing

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Title:	用於聯合通訊與遙測基於正交時頻空調變之合成孔徑雷達成像系統;An OTFS-based Synthetic Aperture Radar Imaging System for Joint Communication and Remote Sensing
Authors:	林智賢;Lin, Chih-Hsien
Contributors:	電機工程學系
Keywords:	正交時頻空調變;合成孔徑雷達;聯合通訊與感知;測距都普勒演算法;通道估測;Orthogonal Time Frequency Space;Synthetic Aperture Radar;Joint Communication and Sensing;Range Doppler Algorithm;Channel Estimation
Date:	2025-08-26
Issue Date:	2025-10-17 12:57:12 (UTC+8)
Publisher:	國立中央大學
Abstract:	隨著通訊技術的演進，高速移動性通道的情況變得越來越常見，其造成通訊系統需處理時變性通道的問題。正交時頻空間（Orthogonal Time Frequency Space, OTFS）調變因其對高都普勒頻率偏移具有良好的強健性（Robustness），因此相較於基於正交分頻多工調變技術（Orthogonal Frequency Division Multiplexing, OFDM）之第四代行動通訊技術（4th Generation Mobile Communication），更加地適用於高速移動下的無線通訊場景。本研究因此基於 OTFS 調變系統發展了通訊與合成孔徑雷達（Synthetic Aperture Radar, SAR）遙感整合系統，應用於無人載具（Unmanned Aerial Vehicle, UAV）中。我們將雷達波訊號從常見的線性頻率調變訊號（Linear Frequency Modulation, LFM）置換成了OTFS訊號，並針對雷達成像演算法—測距都普勒演算法（Range Doppler Algorithm, RDA）進行相應的修正，使其能夠兼容於通訊系統。修正後的演算法可用作條帶（Stripmap）模式下之OTFS 接收端影像處理。其流程包含脈波內（Intra-pulse）都普勒補償，並利用基於領航符元（pilot symbol）的通道估測法來達成等效測距方向壓縮處理。不僅如此，本論文建構了SAR等效通道模型，考慮通道參數經正規化後，非整數之延遲與都普勒頻移的情況，使模擬結果更貼近真實情境。本論文使用影像峰值旁瓣比（Peak SideLobe Ratio, PSLR）與脈衝響應寬度（Impulse Response Width, IRW）作為成像效能評估指標，並與線性頻率調變訊號（LFM）SAR系統進行比較。實驗結果顯示，本論文所提出的處理流程不僅能夠達成良好的 SAR 成像品質，且經都普勒補償後，可有效校正目標物定位偏移的問題，亦可滿足聯合通訊與感知（Joint Communication and Sensing, JCAS）應用的需求。;With the evolution of communication technologies, high-mobility channels have become increasingly common, presenting significant challenges for modern wireless communication systems. Orthogonal Time Frequency Space (OTFS) modulation, with its excellent robustness against high Doppler frequency shifts, demonstrates superior performance compared to Orthogonal Frequency Division Multiplexing (OFDM)-based 4th Generation Mobile Communication technologies, making it particularly suitable for wireless communication under high mobility scenarios. This research develops an integrated communication and Synthetic Aperture Radar (SAR) remote sensing system based on OTFS modulation for Unmanned Aerial Vehicle (UAV) applications. The conventional Linear Frequency Modulation (LFM) radar signals are replaced with OTFS signals. A SAR imaging flow based on modifying the Range Doppler Algorithm (RDA) is proposed, including intra-pulse Doppler compensation and pilot-based channel estimation as range processing for an OTFS receiver operating in stripmap mode. Furthermore, this paper constructs an equivalent SAR channel model that considers normalized fractional delay and Doppler frequency shifts according to the practical conditions. The peak sidelobe ratio (PSLR) and impulse response width (IRW) of the imaging results are assessed and compared with those of the traditional linear frequency modulation (LFM)-based SAR system. Our work demonstrates that the proposed processing method achieves high-quality SAR imaging without positional deviations, making it suitable for joint communication and sensing (JCAS) applications.
Appears in Collections:	[Graduate Institute of Electrical Engineering] Electronic Thesis & Dissertation

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