Channel calibration calculation program for OBEMs
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摘要: 海底电磁接收机(OBEM, ocean bottom electromagnetic receiver)是用于观测海底大地电磁信号的主要仪器。为了验证仪器的功能并提升仪器测量精度,在仪器入水前采用通道标定的方式进行仪器自检。现有的OBME-Ⅲ在进行标定计算时,需将通道标定生成的标定文件从仪器中导出,再借助PC端的Matlab程序进行计算,存在海上作业复杂、计算效率低等不足。针对这一系列问题,笔者开发编写了基于ARM-Linux平台的标定计算程序。通过输入相关命令,便可在OBEM-Ⅲ本地实现通道标定计算,减少了导出数据进行多平台计算引起的麻烦。所采用的混合基快速傅里叶变换计算方法,在保证计算精度的同时,将计算时间从90s缩短到11s,大大提升了计算速度,提高了仪器海上作业的效率。在2020年7~8月南海西南开展的大地电磁科研任务中,该程序表现出色,成功获得高质量海底大地电磁测深数据。Abstract: An ocean bottom electromagnetic receiver (OBEM) is primarily designed to measure the submarine electromagnetic signal. In order to verify the function of the instrument and improve the accuracy of result, the instrument is self-checked by a built-in channel calibration before OBEM enters the water. OBME-Ⅲ needs to export the calibration file generated by channel calibration from the instrument, and then use the Matlab program on the PC side to perform calibration calculation, which has shortcomings such as complex offshore operations and low calculation efficiency. In order to solve these problems, the author developed a calibration calculation program based on the ARM-Linux platform. By entering the relevant commands, the channel calibration calculation can be realized locally in OBEM-Ⅲ, reducing the trouble of exporting data for calculation on multiple platforms. The mixed-base fast Fourier transform calculation method adopted reduces the calculation time from 90 s to 11 s while ensuring the calculation accuracy, which greatly improves the calculation speed and improves the efficiency of the instrument's offshore operations. In the magnetotelluric scientific research mission carried out in the southwest of the South China Sea from July to August 2020, the program performed well and successfully obtained high-quality submarine magnetotelluric sounding data.
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Key words:
- magnetotelluric /
- OBEM /
- calibration calculation /
- mixed radix FFT
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