基于实时操作系统的低成本捷联惯导系统

针对捷联惯导系统低成本、小体积的要求，给出提出一种利用微机械惯性传感器，、以ARM芯片作为导航计算机的硬件方案。设计基于嵌入式实时操作系统的实时多任务导航计算机软件系统。测试结果表明，姿态角度的短期误差可保持在2o范围内，软件系统能合理分配硬件资源，提高导航计算机的整体性能，软件的模块化设计使导航计算机的软件系统具备良好可移植性。

Low Cost Strap-down Inertial Navigation System Based on Real-time Operating System

Existing video image retrieval technology compares with whole information based on two pieces of picture, has large calculated amount, and it does not generate effective video structure. Aiming at this problem, this paper presents a fast image retrieval based on video metadata information. It extracts key frames from interaction information amount, divides key frame into two parts of scene and theme, calculates their gray-scale distribution and probability density, generates video metadata, and goes on video retrieval through metadata information. Experimental results show that this method can research video content for user quickly and correctly.