牲畜生命信息监测雷达的信号处理与仿真

摘要

研究牲畜生命信息优化监测问题,针对牲畜的心跳呼吸在雷达回波信号中所产生多普勒效应的信号特征,建立了生命信息监测的信号模型,设计了配套方案.采用调频中断连续波体制,通过两次傅立叶变换分别获得距离谱和多普勒谱,运用主成分分析方法获取距离信息,引入现代空间谱估计技术与对称双峰配合的方式来识别生命状态,从而获取牲畜生命信息.进行仿真的结果证明了牲畜静止时和低速移动时呼吸和心跳的对称双峰情况,并进行了信号到达角的对比分析,结果与理论要求一致,可对生命信息监测提供参考.%In order to detect livestock life by radar, the modified model and the corresponding method were proposed based on the signal characteristic of the Doppler effect of breath, heartbeat, and so on. As a kind of Frequency Modulated Interrupted Continuous Wave (FM1CW) radar, the range and Doppler spectrum were orderly obtained by two times Fourier Transformation (FT) of echo signals. By Principal Component Analysis (PCA) techniques, the range information was found. Then by spatial spectrum estimation techniques, the more information of livestock life were explored cooperated with the characteristic of symmetry twin peaks. The symmetry twin peaks model of breathing and heart beating was simulated. The Direction of Arrival (DOA) on the echo signal of the immobile livestock and the slow-moving livestock were analyzed and compared. The simulation result is consistent with the theoretical parameter.