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GPS与MEMS-IMU组合导航技术发展现状 总被引:4,自引:0,他引:4
介绍了硅微惯性测量单元(MEMS--IMU)的发展和应用情况,针对目前低成本、小型化的应用要求,分析了GPS和MEMS--IMU各自的优缺点和进行组合导航的可行性。提出了GPS与MEMS--IMU的组合模式,并介绍了组合导航计算机的工作原理和组合导航系统所涉及的关键技术。 相似文献
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GPS/MEMS INS integrated system for navigation in urban areas 总被引:1,自引:2,他引:1
This paper evaluates the performance of a tightly coupled GPS/INS integrated system based on low cost MEMS IMUs in dense urban
areas, and investigates two different methods to improve its performance. The first method used is to derive observations
from two different constraint equations reflecting the behavior of a typical land vehicle. The first constraint equation is
derived assuming that the vehicle does not slip and always remains in contact with the ground. If these assumptions are true
the velocity of the vehicle in the plane perpendicular to the forward direction should be zero. The second constraint equation
is derived from the fact that the height does not change much in a short time interval in a land vehicular environment. Thus,
when a GPS outage occurs (partial/complete), the integrated system combines the INS and constraints-derived virtual measurements
to keep the position and velocity errors bounded. This method is suitable for use in real-time applications. The second method
is specifically suitable for a post-mission application and involves the use of Rauch-Tung-Striebel (RTS) smoother. The designed
system performance is evaluated using two data sets collected in dense urban areas. The obtained results demonstrate the effectiveness
of different algorithms considered, in controlling the INS error growth, and indicates the potential of MEMS IMUs for use
in land vehicle navigation applications. 相似文献
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为开展MEMS型加速度传感器在超高层建筑振动监测应用中的性能对比测试,选取4种不同类型MEMS型加速度传感器与G1B型力平衡式加速度传感器,将其安装在地王大厦相同测点,对MEMS型、G1B型加速度传感器记录的结构环境振动数据进行时程、频谱和模态频率对比分析,并对其记录的结构地震响应进行时域及频域对比。研究结果表明,不同类型MEMS型加速度传感器仪器噪声均大于G1B型加速度传感器,其中MEMS-I型加速度传感器噪声水平相对较小,与G1B型加速度传感器模态频率识别结果及地震响应监测数据吻合较好,验证了MEMS-I型加速度传感器可较准确地记录到结构强振动响应,适用于超高层建筑日常结构振动监测。 相似文献
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传统地震预警方法通过在地震频发区域部署高密度地震监测台网,进而构建区域地震预警系统。但此方法所需投资较高,同时还需要政府和不同行业间的密切合作,使得大部分位于地震频发区域的国家和地区无力支撑地震预警系统的建设与运维。随着微机电系统技术的发展以及智能手机的普及,地震预警技术出现了新的研究方向,利用智能手机开展地震预警具有巨大的发展潜力。迄今为止,国内外已研发完成多款诸如MyShake、i-jishin之类的手机端APP地震预警软件。本文详细描述了利用手机端内嵌MEMS芯片开展地震预警的研究进展,较为系统地总结了在手机端进行地震预警时所涉及的处理流程以及相关算法。 相似文献