Non-contact vital sign measurement has been studied for many years. Researchers devote huge amount of effort to apply this technique into numerous applications, such as vital sign monitoring, Heart Rate Variability (HRV) study, Chronic Heart Failure patients study, tumor tracking, cancer radiotherapy, life detection and rescue, animal health care, etc. Among numerous methods for non-contact vital sign detection, using microwave Doppler radar phase modulation effect is one of the most popular approaches.
This dissertation focuses on accurate measurement of vital signs for human and animal. First, the definition of vital signs and the motivation of non-contact vital sign detection are discussed. Previous works on this topic are reviewed and compared. The bottlenecks of the current state of art are discussed: respiration harmonics issue, fast acquisition of vital sign measurements from a short-period time window and random body movement effect.
In order to measure the vital signs and study the challenges and issues, a 5.8-GHz boardlevel non-contact vital sign detection system is designed and fabricated. The detection theory is explained based on the system structure. Agilent Advanced Design Systems (ADS) is used to perform the system level simulations to verify the theory and help to design the system. This system is built with discrete RF building blocks. The system has been demonstrated the ability to measure heart rate (HR) and respiration rate (RR) from a distance away with convincing accuracy.
Using the 5.8-GHz board-level non-contact vital sign detection system, several methods are developed to solve the issues and challenges of the current state of art and improve the accuracy of vital sign detection. The respiration harmonics cancellation method is developed to eliminate the effect of the respiration harmonics in heart rate measurements and increase the accuracy of heart rate detection. Time window variation technique is developed for fast acquisition of HR from a short-period time window. In order to alleviate the effect of random body movement, the characteristic of the frequency spectrum of the vital sign signal under 1-D RBM, the motion modulation effect, is studied. A new method to detect the movement direction and measure the respiration rate under large 1-D random body movement using single radar system is developed.
At last, the advantages of using non-contact radar system for vital sign measurement for animals and the challenges that are different from human detection are discussed. Tests on different animals are performed and the results are analyzed.
|Commitee:||Eisenstadt, William, q, Long, Maureen, Xie, Huikai|
|School:||University of Florida|
|Department:||Electrical and Computer Engineering|
|School Location:||United States -- Florida|
|Source:||DAI-B 79/04(E), Dissertation Abstracts International|
|Keywords:||complex signal demodulation, doppler radar system, non-contact vital sign detection, random body movement, respiration harmonics cancellation, time window variation|
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