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頁籤選單縮合
題名 | Aspect-Doppler Imaging by Using Wavelet Transform=使用基波轉換之測角--都卜勒成像技術 |
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作者 | 蘇秋楠; | 書刊名 | 筧橋學報 |
卷期 | 4 1997.09[民86.09] |
頁次 | 頁25-48 |
分類號 | 448.5 |
關鍵詞 | 微波成像; 相位調變信號; 基波轉換; 短時區傅氏轉換; 距離--都卜勒成像; 寬頻信號; Microwave imaging; Phase-modulated signal; Wavelet transoform; Short time fourier transform; Range-doppler imaging; Wide-band signals; |
語文 | 英文(English) |
中文摘要 | 此論文展示一種利用單頻雷達回波之測角-都卜勒微波成像技術。由於雷達與目標 之相對運動,雷達回波可視為是一種相位調制信號。此相位調制回波將以基波轉換與短時區 傅氏轉換來作測角-都卜勒分析,其結果並相互比較。基於此角度分集資料之分析結果,微 波成像將可據以完成。不像傳統之距離-都卜勒成像法,本論文所提出之方法可不靠寬頻信 號而達到高的空間解析度。此外,文中亦推導出新的成像法則。文中展示的實驗結果驗證了 此方法的有效性,甚至在目標無法作寬廣角度觀測時亦可獲致不錯之結果。 |
英文摘要 | This paper demonstrates a new approach to microwave imaging based on the aspect-Doppler analysis of single frequency radar echo. Because the relative motion between radar and target, the radar echo can be viewed as a phase-modulated signal. Both continuous wavelet transform (CWT) and short time Fourier transform (STFT) are employed to perform the aspect-Doppler analysis of the phase-modulated radar echo and the results are compared. Basing on the aspect-Doppler analysis, microwave imaging can be completed by using angular diversity data. Unlike the conventional range-Doppler imaging methods, the proposed approach can achieve high spatial resolution without wide-band signals. Besides, new image reconstruction algorithm is developed in this paper. Experimental examples are illustrated to support the effectiveness of the proposed approach. Fairly good results of images are still obtained even though the targets can not be observed in a wide aspect angle. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。