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描述了相干多普勒雷达人体呼吸回波信号的试验研究结果,给出了信息处理的频谱与时域实现及其统计特性。试验表明,在微波频段的声音信号中,人体呼吸引起的回波信号相位调制产生的过程具有周期性关联随机过程的特性。基于等距栅格对该过程的统计特性进行计算,其周期与过程关联周期相等。文中提出了一种随机准则来估算关联周期。对基于等距栅格的过程的遍历性作了理论验证和试验证实。
Describes the experimental results of the human respiratory echo signal of coherent Doppler radar, and presents the spectrum and time domain realization of information processing and its statistical properties. Experiments show that in the microwave frequency band signal, the process of phase modulation of the echo signal caused by the human respiratory has the characteristics of periodic correlation random process. Based on the isometric grid, the statistical characteristics of the process are calculated, and the period is the same as the process related period. In this paper, we propose a stochastic criterion to estimate the correlation period. The ergodicity of the process based on isometric grid is theoretically verified and experimentally confirmed.