海底MT采集电路在非实时监控状态下的容错性设计

THE FAULT TOLERANT DESIGN FOR MARINE MT ACQUISITION CIRCUITRY IN NON-REALTIME MONITOR MODE

测量海底大地电磁场的仪器系统只能以非实时监控模式运行,这给信号的采集工作带来诸多不可预测的因素。在测量周期长、条件恶劣且与人员隔绝的时空条件下,信号测试过程会受到来自环境干扰和电路异常等方面的影响。因而,预防干扰及自动纠错成为海底大地电磁信号采集电路必须具备的功能。针对可能出现的电路故障,设计相应的软硬件纠错方案以确保海底的仪器始终正常工作是十分重要的。详细分析了海洋作业过程中由于强烈振动的影响、电子盘的写盘噪声以及方向传感器的电磁辐射等方面的故障及其产生的原因,并提出了软件与硬件相结合的容错性设计方案,实现了海底电磁信号采集在非实时监控状态下的容错功能。

The instruments for marine magnetotelluric(MT)survey can only work under the nonrealtime control mode, which brings much unpredictable factors to the signal acquisition. Under the situation of long acquisition period, inclement condition and isolation from the people, the signal acquisition may be influenced by the disturbances and abnormities from the environments and the electrocircuit. For these reasons, the instruments for marine MT survey must have the functions of disturbances defendant and automatic error correction. An important task in the acquisition circuitry for marine MT is to design a corresponding error correction scheme for both software and hardware, which is used to eliminate the possible troubles in the electrocircuit.This paper analyzed the reasons which cause the trouble in the electrocircuit during the marine MT data acquisition, and brought forward the scheme of designing a corresponding error correction, implemented the function of error correction under the nonrealtime control mode of marine MT data acquisition.