| Life detector based on radar which is used to detect living things has been propounded by foreign scholars in recent years. This new implement involves both radar and biomedical engineering techniques, and is able to detect vital signals (such as respiration and heartbeat) through the nonmetallic medium (such as brick walls and ruins) in certain range without any electrode or sensor attached to the target. In our group, the life detecting technique has been mainly used to detect human beings and works as follows: first the radar transmits the electromagnetic wave to the human body and gets the echo which includes the vital signals caused by the respiration and heartbeat, then the signals are processed by some hardware and software, and finally the life parameters are obtained. The central processing and controlling unit of the life detector based on continuous wave radar made in our lab at the early time, the PC, could meet the requirements of detection, but the degree of integration, the reliability and the maneuverability were low. In order to satisfy the actual demands, according to its characteristic, the small quantity of data, two data processing systems were first designed and developed. One was based on one MCU, one DSP and A/Ds and the other was based on two MCUs and A/Ds. These two systems successfully realized the functions of life detection and miniaturization. But as the ability and quality of detection are required to be improved, especially after the technique of life detection based on UWB turned up, the two systems could meet neither the requirements of the hardware interface nor the requirements of processing large quantity of data. As a result, the research of signal processing and controlling based on single DSP is proposed. The system developed in this research can process and calculate all the data coming from the UWB with single DSP-TMS320C6713. It realizes the transmission of data in high speed, processing the data and also the transmission of the result in real-time. The system has not only small volume, but also high performance in the ability of anti-interference and detection.This thesis focuses on the following aspects:1. The platform of hardware based on TMS320C6713 has been developed. The data transmitted from the radar is received by the DSP through the serial port. Then, the data is processed with some algorithm of digital signal processing. The result is sent to the SPI-serial port convertor from the DSP, and then, to the control and display terminal. This system can control the procedure of the software according to the order of the control and display terminal as well.2. The software of the radar-based life detector based on DSP developed with C language and assembly language has been completed. The receiving of data and instructions in high speed, processing in real-time and transmission of the results have been realized.3. The hardware and the software have been evaluated. The reliability of the system has been tested by changing the speed of data transmission, and the practicability of the system has been tested by conducting experiments in several kinds of environment.Innovations in this thesis are listed as follows:1. A hardware platform of UWB radar-based life detecting system based on DSP has been developed. So the miniaturization of the system has been realized. This hardware platform can receive data and instructions in high speed, process data and transmit the result in real-time.2. The software applied to detect life which is fit for the hardware has been designed. This software realizes the life detecting, and what's more, it has been optimized according to the hardware and software pipelining. Lastly, the running speed of the software is enhanced. |
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