An Improved Time-Reversal-Based Target Localization for Through-Wall Microwave Imaging
سال انتشار: 1392
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 1,030
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شناسه ملی سند علمی:
JR_JECEI-1-2_004
تاریخ نمایه سازی: 15 آذر 1394
چکیده مقاله:
Recently, time reversal (TR) method, due to its high functionality in heterogeneous media has been widely employed in microwave imaging(MI) applications. One of the applications turning into a great interest isthrough-wall microwave imaging (TWMI). In this paper, TR method is applied to detect and localize a target obscured by a brick wall using a numerically generated data. Regarding this, it is shown that when thesignals acquired by a set of receivers are time reversed andbackpropagated to the target-embedded media, finding the optimum time frame which the constituted image represents a true location of the target becomes infeasible. Indeed, there are situations pertinent to the target distance ratio that the previously-used Maximum field method and Entropy-based methods may fail to select the optimum time frame. As a result, an improved method which is based on initial reflection from thetarget is proposed. According to different target locations described in this research, the results show this method prevails over the shortcomings of the formermethods.
کلیدواژه ها:
Finite-difference time-domain Optimumfocusing Target distance ratio Target initial reflection Through-wallmicrowave imaging Time reversal