【作者】 王秀丽；

【导师】 郭改枝；

【作者基本信息】 内蒙古师范大学 ， 计算机科学与技术， 2016， 硕士

【摘要】 供水管道与人们的日常生活紧密相连,管道漏水不仅会造成经济上的损失,还会破坏周围的生态环境。因此,对管道漏水检测的研究是意义深远的。本设计采用无线数据传输设备传送采集到的两路漏水信号,然后通过自适应滤波算法对漏水信号进行滤波。将滤波后的两路纯净信号进行相关算法运算,从而找到管道的正确漏水点。本设计主要研究两部分内容,无线数据传输漏水信号部分和自适应算法滤波处理漏水信号部分。根据对不同频率的无线传输方式穿越障碍物能力、传输距离和传输损耗等性能的对比分析,本设计的无线数据传输部分以MSP430F149为核心控制器,选择绕射能力强,低功耗且传输距离相对较远的433MHz的CC1101芯片作为无线收发芯片,结合外围传感器组成无线收发系统。发送模块把从传感器采集到的并且经过A/D转换后的数字信号以数据包协议形式发送到接收模块。研究无线传输的相关理论后,在MATLAB上仿真漏水信号,并将其保存到.dat文件中待传输。然后在IAR软件上设计相应的C语言程序,编译、调试成功后,把.HEX文件下载到CC1101节点芯片内,实现无线数据传输。由于采集供水管道漏水信号时,夹杂着多种噪声,尤其是突发的高频率噪声,所以要对信号进行滤噪。本设计选择具有高性能的数字信号处理器dsPIC30F6014作为自适应滤波系统的MCU微处理器,通过最小均方Least Mean Squre(LMS)算法对漏水信号进行滤波处理。在MATLAB上验证滤噪方法的正确性,然后在DSP系统的开发工具MPLAB IDE上编写C语言程序,实现了模拟dsPIC30F6014芯片滤波处理漏水信号的过程。实验结果表明,本设计中采用的滤噪方法具有可行性,有实际的应用价值。更多还原

【Abstract】 The water supplying pipeline is closely connected with people’s daily life, which can not only cause economic losses, but also damage the ecological environment. Therefore, the research on the detection of pipeline leakage is of profound significance. The design of wireless data transmission equipment is used to send two water leakage signal, then I use adaptive filtering algorithm to filter noise. Compute the two pure filtered signals with correlation algorithm in order to find the exact point of water leakage pipeline. This design mainly research two parts, wireless data transmission water leakage signal and the adaptive filter algorithm water leakage signal processing.According to the comparison of performance analysis results on the crossing obstacle capability, transmission distance and transmission loss of wireless transmission on different frequencies. The design of wireless transceiver system is based on MSP430F149 which is the core controller, selecting CC1101 chip in 433MHz which has diffraction ability, low power consumption, long transmission distance as the peripheral sensor. The sending module put the digital signal which is gathered from the sensor and conducted with A/D conversion and then sent to the receiving module in the digital signal. After studying the theory of wireless transmission, simulate signal leakage by MATLAB and save the.dat file. And then design the appropriate C language program on the IAR, compiling, debugging. After the adoption, download the.HEX file into the CC1101 chip node, complete the wireless data transmission.Due to the acquisition of water supply pipe leakage signal mixed with a variety of noise, especially sudden high-frequency noise, we must filter it. This design uses the high performance digital signal processor dsPIC30F6014 as the core processor of the adaptive filtering system, and the water leakage signal is processed with the Least Mean Square (LMS) algorithm. Verify the correctness of the method on the MATLAB, and then programme in C language on the DSP system development tool MPLAB IDE. Achieve a filtering process simulate dsPIC30F6014 chip leakage signal. The experimental results show that this method is feasible and has practical application value.更多还原