Abstract: On the basis of the structural characteristic of a Hyper Spectral Imager (HSI),a split-type POS installation scheme used for a three-axis Inertially Stabilized Platform (ISP) is proposed and the mounting bracket is then optimized based on multi-objectives.The POS installation scheme is composed of four parts which are overall layout,POS installation plan,mass balance plan and mounting bracket optimization,respectively.Firstly,optimized overall layout is determined according to the structural characteristics of the load,POS and ISP,namely,POS/holder and counterweight/holder are symmetrically installed on the ISP azimuth gimbal to offset the eccentric torque to roll and pitch axes whatever the imaging sensor is rotated to any position along azimuth axis.Secondly,to decrease the installation space,the POS is designed to install vertically on the top surface of azimuth gimbal.Thirdly,the counterweight is placed on the outer edge to produce the biggest moment while minimizing the mass.Fourthly,the multi-objectives optimization of mounting bracket based on the ANSYS Workbench simulation environment is carried out,resulting in mass decreased by 26.7 % under the condition of maintaining the strength and stiffness.Finally,based on the proposed scheme and optimized results,a three-axis ISP achieves high control accuracy which further helps the success of high-accuracy imaging of a HSI in the aerial remote sensing experiments.

Key words: Inertially Stabilized Platform(ISP), Position and Orientation System(POS), eccentric moment, topology optimization, muti-objectives optimization