内卫星辐射计效应建模与分析

Modeling and Analysis of Radiometer Effect on the Inner-satellite

辐射计效应是内卫星的主要干扰因素之一,是决定内编队重力场测量水平的重要因素.通过分析内卫星所受辐射计效应产生的原因,建立了内卫星辐射计效应模型,并分析了各个参数对辐射计效应的影响及减小辐射计效应的方法.结果表明,通过降低腔体中平均压力、内卫星表面和外卫星腔体内壁面温度梯度以及内卫星的面质比均可减小辐射计效应引起的加速度.

Radiometer effect is a kind of thermal noise caused by temperature gradient.It is one of the main interfering factors to the inner-satellite,and is important to measure gravitational field. By analyzing the cause,the model of inner-satellite radiometer effect was established by the kinetic theory of gas molecules.In the model,the inner-satellite radiometer effect was divided into two parts. One was the reaction force and its torque caused by gas molecules which escaped from inner-satellite surface.The other was the force and its torque caused by collision of gas molecules which escaped from the cavity wall on the outer-satellite.Then the influence of various parameters to inner-satellite radiometer effect was analyzed and methods of reducing the inner-satellite radiometer effect were found.The results showed that through lowering the pressure and temperature gradient in cavity, as well as using materials with low surface-mass ratio,the acceleration caused by radiometer effect could be reduced.