A Novel Separated Position and Orientation System Integrated with Inertially Stabilized Platform

Yanshun Zhang,Zhanqing Wang,Ming Li,Xiaopeng Xi,Shuangji Feng

doi:10.1155/2018/4150706

Abstract

Considering the application requirements of independent imaging payloads design, a novel scheme of separated position and orientation system (POS) is proposed, in which the high-precision inertial sensors of traditional centralized POS fixed on the imaging payloads are mounted on three gimbals of the inertially stabilized platform (ISP), respectively, and make them integrated. Then, the kinematics model of the ISP system is built to transmit the inertial information measured by separated inertial sensors mounted on ISP gimbals and flight body to the imaging payloads, calculating the position and attitude of the imaging payloads to achieve the function of separated POS. Based on the model, a series of simulations indicate that the precision difference between separated system and centralized system is ignorable under the condition of angular motion and variable velocity motion. Besides the effective function equal to traditional centralized system, the separated POS enhances the integration with the ISP. Moreover, it improves the design independence of the imaging payloads significantly.

Highlights

The remote sensing system is an effective way to achieve highresolution earth observations and obtain high-resolution images [1, 2]
The imaging payloads are mounted on azimuth gimbal of the inertially stabilized platform (ISP) system, and the position and orientation system (POS) consists of three gyros and three accelerometers are usually fixed on the imaging payloads so that the motion parameters of the imaging payloads can be measured by POS directly [6,7,8]. (It is called “centralized POS” below.)
This paper presents the separated POS design idea, in which the inertial sensors from original centralized POS are mounted on three gimbals of the ISP system separately to make POS and ISP integrated

Summary

Introduction

The remote sensing system is an effective way to achieve highresolution earth observations and obtain high-resolution images [1, 2]. The imaging payloads are mounted on azimuth gimbal of the ISP system, and the POS consists of three gyros and three accelerometers are usually fixed on the imaging payloads so that the motion parameters of the imaging payloads can be measured by POS directly [6,7,8]. It is technically feasible to realize the integrated design, in which the high-precision inertial sensors from centralized POS are mounted on three gimbals of the ISP. The design scheme proposed can simplify the mechanical interfaces among imaging payloads, POS and ISP It improves the attitude stabilization accuracy of payloads effectively. The integrated design idea improves the design independence of the imaging payloads significantly

The Principle of Imaging Payloads Stabilization in Remote Sensing System

The Design Scheme of Separated POS

Simulation

Conclusion