摘要
本综述将静电悬浮加速度计性能指标项目归为五类,阐述了它们与需求的关系,强调了采样率为10SPS、相应的闭环传递函数带宽为3Hz的必要性。指出实验室标定会受到环境振动噪声的干扰,通常的标定方法均不适用,静态标定的首要困难在于准确测定失准角;用专用摆台作动态标定可以大致判断标度因数并观察两台加速度计模型方程各参数的一致性;为了在专用摆台上进行各项性能测试,加速度计检验质量需要在地面重力下悬浮;落塔试验的功用有限,并非加速度计性能指标的量化评定试验;射前检验加速度计噪声采用分析证实的方法,为了降低噪声,必须依靠详尽的理论分析和实验验证,一一找出各种影响因素及其影响程度,采取有力措施,切实加以改进。
In this paper,the specification items of the accelerometers are reduced to five kinds,of which the relation to the requirements is explained.It is accentuated that the sample rate of 10 SPS and the corresponding 3Hz bandwidth of the closed loop transfer function are indispensable.It is pointed out that the laboratory calibration shall be disturbed by the ambient vibration noise,so usual calibration methods are not applicable without exception,and main difficulty of the static calibration is accurately determining misalignment angles;the scale factors could be approximately estimated and the consistency of various parameters of the model equation for the twain accelerometers could be observed through the dynamic calibration with a dedicated pendulum bench;in order to implement various performance tests for accelerometers in the dedicated pendulum bench,the proof mass of the accelerometer is required to be levitated under the ground gravity;the function of the free fall test is limited and the test is not quantitative assessment test for the performance index of accelerometers;the analytic confirmation method is adopted to verify the noise of accelerometers before launch,and in order to reduce the noise,one must depend on the exhaustive theoretic analysis and experimental validation,find out the various influence factors and degrees one by one,take forceful means and faithfully improve the insufficiencies.
出处
《宇航学报》
EI
CAS
CSCD
北大核心
2011年第8期1655-1662,共8页
Journal of Astronautics
关键词
卫星重力测量
静电悬浮加速度计
动态标定
落塔试验
噪声分析
Satellite gravity measurement
Electrostatically suspended accelerometer
Dynamic calibration
Free fall test
Noise analysis
