隔离度改善对雷达语音传感器影响的实验研究  

Experimental Study on Effect of Isolation Improvement on Radar Speech Sensor

作　　者：焦明克[1] 耿西亮[1] 焦琳[1] 张鹏[1] 薛玉川[1] 王时庆[1] 王健琪[2] 

机构地区：[1]兰州军区乌鲁木齐总医院医学工程科,乌鲁木齐830000 [2]第四军医大学生物医学工程学院,西安710032

出　　处：《医疗卫生装备》2013年第3期11-12,40,共3页Chinese Medical Equipment Journal

基　　金：国家自然科学基金资助项目(60571046)

摘　　要：目的:研究生物雷达收发天线隔离度的改善对超外差生物雷达语音传感器检测灵敏度和检测信号信噪比的影响。方法:通过设计制作的高性能隔离网和增加雷达天线间距离的方法来提高收发天线的隔离度。采用频谱分析仪检测不同发射功率下隔离度改善前后接收天线耦合功率值,并进一步对比分析隔离度改善前后雷达采集到的语音信号语谱图。结果:实验表明,在不同的发射功率,使用隔离罩和增加天线间距使生物雷达的隔离度提高了约10 dB,并提高了雷达语音信噪比。结论:隔离度的改善有效提高了生物雷达语音传感器的语音信号检测能力。Objective To study the effect of isolation improvement of radar antennas on the signal detection sensitivity of bio-radar speech sensor and signal-to-noise（SNR）.Methods Firstly,the high performance isolation cover was designed and the distance between two antennas was increased to improve the isolation of superheterodyne radar antennas.Secondly,the isolation value of radar antennas was detected and compared before and after isolation improvement with different transmit powers.Finally,the spectrums of radar speech signal detected by different isolation radars were compared.Results The results showed that the isolation cover and increased distance between the antennas could make the bio-radar isolation value enhanced by 10 dB and the SNR.Conclusion Isolation improvement can effectively improve the detection sensitivity and capability of bio-radar speech sensor.

关 键 词：隔离度 雷达语言 检测灵敏度 信噪比 

分 类 号：R318.6[医药卫生—生物医学工程]