Requirement analysis of accelerometer temperature coefficient in gradiometer measurement
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摘要: 加速度计的零位偏置、标度系数对温度很敏感,从而影响重力梯度测量系统的精度,将加速度计零位偏置、标度系数的温度系数代入重力梯度测量方程中,并给定重力梯度测量系统的精度、测量范围和温度变化范围,经过仿真计算得到系统对加速度计温度系数的要求.最后,选取某典型加速度计,通过优化组合,温度系数两正、两负配对使用,使得4只加速度计标度系数的温度系数和从15.255 ppm/℃降低到1.075 ppm/℃,满足系统要求.Abstract: The accelerometer bias and the scale factor are sensitively influenced by temperature so that the precision of gradiometer measurement system is affected.The measurement equation is derived according to the principle of gravity gradiometer including the temperature coefficient of accelerometer bias and the scale factor.The values' range of scale factor coefficient of temperature is presented by assuming some parameters and analyzing the relation equation.Taking some accelerometers for example, the choice of two positive temperature coefficients and two negative temperature coefficients makes the total temperature coefficient fall from 15.255 ppm/℃ to 1.075 ppm/℃ and meets the demand of the temperature coefficient.
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