基于94 GHz非对称天线生物雷达系统的语音探测性能实验研究

Experimental study on speech detection performance based on 94 GHz asymmetric antenna biological radar system

目的 :研究94 GHz非对称天线生物雷达系统的人体语音探测性能,进一步提高生物雷达语音探测能力。方法:以94 GHz非对称天线生物雷达系统为核心,设计该雷达系统与94 GHz对称天线生物雷达系统、麦克风系统的语音探测性能对比实验,并利用语谱图等评估方法对系统的语音探测性能进行分析。结果:对称天线雷达采集的人体语音信号频率范围为0~1 000 Hz,将直径为600 mm卡塞格伦天线作为接收模块的94 GHz非对称天线雷达采集的人体语音信号频率范围为0~1 200 Hz。结论:将直径为600 mm卡塞格伦天线作为接收模块的非对称天线生物雷达获取语音信号的能力更强,探测距离更远。

Objective To study the human speech detection performance of 94 GHz asymmetric antenna biological radar system and further improve the speech detection capability of biological radar. Methods With a 94 GHz asymmetric antenna biological radar as the core, a comparison experiment between the radar system, the 94 GHz symmetric antenna biological radar system and the microphone system was designed, and the performance of the system was evaluated by means of spectrogram methods. Results The frequency range of speech signals detected by the 94 GHz symmetric antenna radar was about 0 to 1 000 Hz, and the frequency range of human speech signals detected by the 94 GHz asymmetric antenna radar with a diameter of 600 mm as the receiving module was about 0 to 1 200 Hz. Conclusion The asymmetric antenna biological radar with a diameter of 600 millimeter antenna as the receiving module has a strong ability to obtain speech signals and has a long detection distance.