基于SQUID的超低频透地通信研究  

Super Low Frequency Though-The-Earth Communication Based on SQUID

作　　者：郝欢[1] 王华力[2] 张翼鹏[3] 

机构地区：[1]解放军理工大学通信工程学院研究生4队,江苏南京210007 [2]解放军理工大学通信工程学院 [3]解放军南京炮兵学院,江苏南京210000

出　　处：《军事通信技术》2017年第1期1-6,共6页Journal of Military Communications Technology

基　　金：国家自然科学基金资助项目(61271354)

摘　　要：通过深藏地下的战略要点构建可靠的应急通信,是维持战略威慑的重要保证。文章利用低温SQUID便携式接收机搭建了超低频透地通信系统,并成功开展了不同速率的2FSK通信实验。首先根据电磁波在大地媒介中的传输特性以及煤矿井下的干扰环境,选择合适的通信频点。然后利用最小二乘法和带通滤波器对工频干扰和带外干扰进行抑制以提高接收信号的信噪比,最后采用包络检波的方法对信号进行解调。实验结果表明,利用低温SQUID低频接收机在井下400m处能够有效接收到超低频通信信号。当通信速率为50bps时,2FSK误码性能优于0.1,验证了该系统的有效性。It is important to construct reliable emergency communication with underground strategic points for maintaining strategic deterrence. In this paper, a low-temperature Supercon- ducting Quantum Interference Device（SQUID） based receiver was adopted to construct a super low frequency though-the-earth communication system and 2FSK communication with different communication rates were performed successfully. The transmission characteristic of the electro- magnetic wave through the earth and the ambient noise under the coal were studied firstly. Con- sequently, the communication frequency was chosen according to the channel characteristics. And then least square and bandpass filter were used to suppress the harmonics and out-band noise to improve the Signal to Noise Ratio（SNR） in the received signal. Finally, envelope detection was adopted to demodulate the received FSK signal. Experimental results show that the low-tem- perature SQUID based receiver can receive the super low frequency communication signal very ef- ficiently about 400 meters under the coal mine. When the communication rate is 50 bps, the per- formance of Bit Error Rate（BER） of 2FSK precedes 0.1, which validates the effectiveness of the proposed system.

关 键 词：低温超导量子干涉器件 超低频 透地通信 工频干扰 最小二乘 

分 类 号：TN911.72[电子电信—通信与信息系统]