【作者】 孟菊；

【导师】 王金海；

【作者基本信息】 天津工业大学 ， 计算机应用技术， 2006， 硕士

【摘要】 全光纤加速度地震检波器在地震勘探中能够提供灵敏度高、抗干扰性强和非接触的测量优点，具有广阔的应用前景，而信号处理将直接影响到测量的分辨率、精度和动态范围等因素，它的性能高低在很大程度上决定了整个检波系统的性能。为此，本论文提出了一种嵌入式解决方案，通过这种网络化的嵌入式仪器系统实现全光纤加速度地震检波器中的数字信号处理功能，即实现合成外差干涉解调算法，滤除混杂的噪声和干扰，解调出满足精度要求和实时性要求的相位信号，从而得到待测的加速度信号。为基于光学干涉原理的信号检测乃至其他的测试仪器的实现提供了一种新的解决方案。本嵌入式信号处理系统采用双处理器的结构，核心器件为ARM和DSP。提出了一种嵌入式系统设计方案及实现方法，主要通过ARM进行远程数据通信，通过DSP实现解调算法，并扩展了多种输出接口。介绍了DSP与ARM的数据通信方式，讨论了嵌入式操作系统Linux的移植方案，阐述了合成外差干涉解调算法的原理及在该嵌入式系统中实现的整体流程。采用数字信号处理方式实现光纤加速度检波器的相位解调，具有很好的稳定性、灵活性和抗干扰性能力，并且具有友好的交互界面、网络化互联功能、实时的数据处理能力。能够满足传感器信号测量的实时性、精确性及可靠性要求。更多还原

【Abstract】 All-optical fiber acceleration seismometer can offer sensitivity, anti-jamming and no-touched advantage which has an extensive application field, and its signal processing ability decide whole system’s performance to some extent, because it will affect directly factors such as resolving power, precision dynamic range. In this paper, an embedded scheme was presented for implementing synthetic-heterodyne interferometric demodulation of acceleration seismometer system, disposing of noise and demodulating the satisfied phase signal, finally, acceleration signal was measured. This method will provide a new scheme for implementing signal detection and other measue instruments of optic interferometric principle.The signal processing system embedded kernel apparatus of ARM and DSP. The design scheme and realization method of embedded system are presented. ARM was used to communicate data and DSP implemented phase demodulation, and it expanded several interfaces. This system introduced the information communication mode of DSP and ARM and Linux OS transplant scheme. Furthermore, Synthetic-heterodyne interferometric demodulation principle and implementation flow in this embedded system were introduced.Implementing phase demodulation of the optical fiber acceleration seismometer by digital signal processing method will have the advantages of stability, sensitivity and anti-jamming, and have mutual function, network function and real time data processing ability. This system can reach the requirements of real time, accuracy and reliability.更多还原