摘要 雷达传感系统的非接触、隐蔽性、全天候测量的优势使其在婴儿、烧伤患者等特殊对象的生命体征探测方面具有良好的应用前景。文中针对探测过程中的空探测点问题和解调过程中的直流偏移问题提出了一种基于复信号解调的多普勒雷达系统设计方法。该方法将零中频正交解调结构输出的两路基带信号合成复信号,再对复信号进行快速傅里叶变换得到待测对象的生命体征信号。测试结果表明,当系统在中心频率2.45 GHz工作时,探测得到的人体呼吸频率和心跳频率分别约为0.3 Hz和1.1 Hz,满足系统设计预期。 The radar sensor system has a good prospect in the detection of vital signs of special objects such as infants and burned patients for its advantages of non-contact,concealment and all-weather measurement.In this paper,a design of Doppler radar system based on complex signal demodulation is proposed for the effect of null point issue and the dc offset.The complex signal consisted of the two baseband signals output from the zero-IF quadrature demodulation structure is performed fast Fourier transform to obtain the vital sign of the object.The test shows that when the system works at the center frequency of 2.45 GHz,the frequency of respiration and heartbeat are respectively about 0.3 Hz and 1.1 Hz,which meet the design expectation.
机构地区 南京航空航天大学电子信息工程学院
出处 《电子科技》 2021年第6期23-27,共5页 Electronic Science and Technology
基金 江苏省自然科学基金(BK20181290) 毫米波国家重点实验室开放课题(K201919)。
关键词 生命体征探测 多普勒雷达 空探测点 直流偏移 零中频 正交解调 复信号解调 快速傅里叶变换 vital sign detection Doppler radar null point dc offset zero-IF quadrature demodulation complex demodulation fast Fourier transform
