【摘要】 基于井下近钻头信息短距离有线传输安全性低,声波传输信息量小的问题,本文设计了短距电磁脉冲无线数字传输系统。该系统是采用SOPC技术,基于可编程逻辑器件FPGA内嵌NiosII软核处理器为核心的数字传输系统,包括电磁脉冲发送与电磁脉冲接收部分,接收电路中采用了高速低功耗的串行模数转换器,接收滤波器采用了FPGA设计分布式算法的高阶高速匹配滤波器,该滤波器可获得理论上最佳信噪比。实验结果表明:匹配滤波器滤波后较直接接收信号的信噪比提高了5 dB。该系统具有传输速率高,整体系统功耗低的优点。更多还原

【Abstract】 The short distance wired transmission of near bit information is low security. Sound wave transmission rate is low. An electromagnetic pulse short-distance wireless digital communication system is designed in the paper. Based on SOPC technology,the CPU of system uses NiosII processor embedded IP core on FPGA. The system is composed of two parts: the transmitter part and the receiver part over drilling tools. An analog digital converter of high speed and low power is adopted for signal acquisition.Receiver filter is a high speed and high order matched filter designed with distributed arithmetic(DA)on FPGA. The experimental result shows that the signal to noise ratio of the direct received signal is improved by 5 dB after the matched filter. Advantages of the system are high transmission rate and low power.更多还原