Nano- g accelerometers are widely used in space exploration and measurement of the earth's gravitational field. It is essential to precisely evaluate error effects at high orders such as cross-coupling for applications in a dynamic environment. Nevertheless, it remains challenging to meet the precision requirements using conventional calibration measures. In this article, we propose a method to separate the cross-coupling coefficients of a linear single-axis accelerometer by mounting it on a steadily rotating rate table that is tilted at a fixed deviation angle with respect to the horizontal plane. The gravity component is periodically modulated along the input axis per revolution. Simultaneously, a series of centripetal acceleration is applied along the cross axis in sequence while adjusting the rotation frequency of the rate table by steps. Thus, the cross-coupling coefficient can be separated by its dependence both on the modulated gravity acceleration and the centripetal acceleration. In comparison to the static multipoint angular rotation test on a tilted dividing head, the proposed dynamic modulation method demonstrates improved robustness against corruption from bias drift, with an improved uncertainty. This method to separate the cross-coupling coefficient is suitable for testing high-resolution accelerometers, without requiring high bias stability or sensitive response sustaining at ultralow frequency.

中文翻译：

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通过倾斜速率表上的连续旋转调制估计纳克加速度计的交叉耦合系数


纳克加速度计广泛应用于太空探索和地球引力场测量。精确评估高阶误差影响至关重要，例如动态环境中应用的交叉耦合。然而，使用传统的校准措施来满足精度要求仍然具有挑战性。在本文中，我们提出了一种分离线性单轴加速度计交叉耦合系数的方法，方法是将其安装在相对于水平面以固定偏差角倾斜的稳定旋转速率台上。每转沿输入轴周期性地调制重力分量。同时，沿横轴依次施加一系列向心加速度，同时逐步调整速率表的旋转频率。因此，交叉耦合系数可以通过其对调制重力加速度和向心加速度的依赖性来分离。与倾斜分度头上的静态多点角旋转测试相比，所提出的动态调制方法表现出改进的鲁棒性，以防止偏置漂移造成的损坏，并具有改进的不确定性。这种分离交叉耦合系数的方法适用于测试高分辨率加速度计，不需要高偏置稳定性或在超低频下维持灵敏的响应。