#### Table of Content

25 October 1999, Volume 19 Issue 05
 An Optimal Allocation Model of the Partial Satellite System Design Specification Cao Xibin Zhang Fan (Harbin Institute of Technology,Harbin 150001) 1999, 19 (05):  .  Abstract ( 1925 )   Allocating properly the system specification plays an important role in the satellite system design.In the paper,satellite system design specification including error,mass,power and reliability are optimally allocated with nonlinear optimization and Multiobjective and Multidisciplinary Design Optimization (MMDO).The result shows that the optimization models and the optimization methods,nonlinear optimization and multiobjective and multidisciplinary design optimization,are both feasible and effective.
 The Simple Algorithm of Electromagnetic Refraction Error Due to Atmosphere Refractivity Dry Component Zhang Yu (China Research Institute of Radiowave Propagation,Xinxiang 453003)) 1999, 19 (05):  .  Abstract ( 1591 )   The simple algorithm of electromagnetic refraction error due to atmosphere refractivity dry component is presented.It puts emphasis on the method to obtain the practical model of the equivalent height of atmosphere refractivity dry component and ground temperature under existing conditions with the example of the model cofficient in a certain area of China.
 Experimental Investigation on Correction of Thermal and Gravitational Distortion of Mirrorswith Adaptive Optics Zhang Zhiwei (Beijing Institute of Space Science & Technology Information,Beijing 100086) Yu Xin (Beijing Institute of Technology,Beijing 100081) Yang Bingxin (Beijing Institute of Space Mechanics and Electronics,Beijing 100076) 1999, 19 (05):  .  Abstract ( 1702 )   The paper presents the necessity of employing adaptive optics on high resolution space mirror.The experimental setup of the correction of mirror thermal and gravitational distortion using adaptive optics is introduced.The experiment result is compared with that of the finite element analysis.A reflective plane mirror is used as a model of the primary mirror of the space camera to simulate its thermal and gravitational distortion.A close loop experiment with the 61 unit adaptive optics system is done,the corrective effect of the aberration of the Zernike polynomial is analyzed,and the biggest distortion (P V) value and RMS value of the wavefront after close loop correction is λ/4 and λ/30 seperately.This experiment greatly support the application of adaptive optics on space camera.