Design of High-speed Acquisition System for Interference Signals of Marine Absolute Gravimeter
The ocean absolute gravimeter is a metrological instrument for the on-site calibration of current marine gra-vimeters based on the principle of relative measurements.A software and hardware design scheme for a high-speed interfer-ence signal acquisition system based on field programmable gate array(FPGA)is proposed to address the measurement char-acteristics of high-precision and high-frequency ocean absolute gravimeters.The selection and design of hardware circuits such as high-precision analog-to-digital converter conditioning and operational amplifier circuits have been completed.The logic control of USB3.0 data high-speed transmission module is realized by Verilog hardware description language.Then,a host computer with perfect functions and high visualization degree is developed by C#language to realize the processing and solving of gravity data.Finally,the test platform of the measured signal system is built based on the ocean absolute gravim-eter.The test results show that the standard deviation of gravity obtained from 200 times absolute gravity measurements is 0.6 mGal and the class A uncertainty is 42.4 μGal.The designed acquisition system can meet the requirements of high fre-quency and mGal measurement accuracy of marine absolute gravimeter,and the research results can provide guarantee for the effective measurement of marine absolute gravity.
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