摘要
为解决基于连续波(continuous wave,CW)多普勒雷达的生命体征探测中存在的探测零点问题,提出一种新型的并发双频段混合下变频的雷达收发机系统.提出的雷达系统工作频率为2.05 GHz和1.64 GHz,利用信号间的相关性可以提升系统的整体性能.在λ/4距离处,单频段单通道检测存在探测零点问题,而提出的双频段双通道检测可以改善系统中的探测零点问题;在非λ/4距离处,双频段双通道检测结果之间可以相互验证,确保了生命体征探测系统的探测准确度.仿真结果证明了此雷达系统的可行性,无论探测的距离是否在λ/4距离处,所提出的生命体征探测系统总能获得有效的生命体征信号.
In order to solve the problem of the null detection point in the vital signs detection based on continuous wave(CW)Doppler radar,a novel dual-band hybrid down-conversion radar transceiver system is proposed.The proposed radar system operating frequency is 2.05 GHz and 1.64 GHz.Correlation between signals can improve the overall performance of the system.Atλ/4 distance,the single-band single-channel detection has the problem of null detection point,and the proposed dual-band double-channel detection can solve the null detection point.On the other hand,at the non-λ/4 distance,the results of the dual-band detection double-channel can be mutually verified,ensuring the detection accuracy of the vital sign detection system.The simulation results prove the feasibility of the radar system.Regardless of whether the detected distance is at theλ/4 distance,the proposed vital sign detection system can always obtain the vital sign.
作者
刘文奎
马骏骁
傅海鹏
LIU Wenkui;MA Junxiao;FU Haipeng(School of Microelectronics,Tianjin University,Tianjin 300072,China;China Academy of Space Technology,Beijing 717071,China)
出处
《电波科学学报》
CSCD
北大核心
2021年第1期156-162,共7页
Chinese Journal of Radio Science
基金
国家自然科学基金(61831017)。
