Using Ultra-wideband Array Radar System for 3D Human Respiration Detection
Date Issued
2014
Date
2014
Author(s)
Liao, Kuei-Da
Abstract
The purpose of this study is to using electronic scanning 2D PCB array antenna to achieve 3D imaging as well as 3D respiratory motion detection and estimation. The proposal for 3D imaging is because the positioning ability for 3D imaging is better than 2D imaging with providing additional dimension in real case and applications. The 2D array antenna applied in this study is a X-shaped array antenna. The imaging and the good positioning will be based on the use of UWB signal. The 1D synthetic aperture in previous study is contributed to mechanical scanning by step motor. However, the scanning speed and the setup time for mechanical scanning are concerns when it comes to applications. Therefore, using electronic scanning to scan over our array antenna is proposed. The center frequency of transmitted signal should follow the FCC defined unlicensed band for UWB use. Consequently, the transmission circuit is redesigned to generate signal with center frequency at 3GHz. Under the same fractional bandwidth, the bandwidth would increase and the resolution would be better with the raise of center frequency. However, in this study, the circuits meeting our proposal could not generate signals with enough power. Hence the original 1.5 GHz is still applied in the following system. Finally, 3D UWB imaging system and the respiration detection algorithm, generalized incoherence factor (GICF) and filter bank assisted generalized coherence factor (FBGCF) are applied to achieve both 3D imaging and human respiratory motion detection and estimation. However, the detection outcome is not ideal due to poor system performance such as antenna power gain, crosstalk, and the inaccurate system delay calibration.
Subjects
超寬頻脈衝產生電路
超寬頻雷達陣列
三維呼吸偵測
Type
thesis
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