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旋转条件下非连续卫星导航信号处理技术 被引量:6
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作者 袁赫良 金天 +1 位作者 曲家庆 吕红丽 《系统工程与电子技术》 EI CSCD 北大核心 2021年第9期2573-2580,共8页
针对传统卫星导航技术无法估计旋转载体的转速,且旋转导致的卫星信号非连续性使得定位和转速估计更加困难的问题,提出一种基于多天线结构的开环跟踪与差分卡尔曼滤波相结合的跟踪定位方法,并利用相邻天线间的多普勒频率差值实现载体转... 针对传统卫星导航技术无法估计旋转载体的转速,且旋转导致的卫星信号非连续性使得定位和转速估计更加困难的问题,提出一种基于多天线结构的开环跟踪与差分卡尔曼滤波相结合的跟踪定位方法,并利用相邻天线间的多普勒频率差值实现载体转速估计。同时,利用开环结构无反馈回路和快拍方式工作的特点实现对非连续信号的跟踪。差分卡尔曼滤波以相邻历元间差分值进行建模,消除原始观测量中公共偏差,实现跟踪信息的融合滤波和定位。最后,利用相邻天线间共视卫星的多普勒频率差值实现载体转速估计。基于模拟信号和实际信号的实验结果表明,所提算法能够实现对卫星信号的持续跟踪,并且获得高精度的定位结果,对转速的估计误差的标准差不超过1 rps。 展开更多
关键词 卫星导航 旋转非连续 开环跟踪 差分卡尔曼滤波 转速估计
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Study on geometric models of non-numerically controlled machining revolving cutter with constant pitch 被引量:1
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作者 韩成顺 尚元江 +2 位作者 王景贺 唐余勇 董申 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2004年第4期356-360,共5页
This paper presents a new approach of designing the revolving cutter with constant pitch, and provides geometric models. The corresponding models in the non-numerically controlled manufacturing, such as designing the ... This paper presents a new approach of designing the revolving cutter with constant pitch, and provides geometric models. The corresponding models in the non-numerically controlled manufacturing, such as designing the helical groove, grinding wheel, relative feeding motion, and calculating the helical angle of the cutting edge, are introduced. The examples are given to testify that the design approach is simple and readily realized in machining the revolving cutter with constant pitch. The effective design and manufacture method provides general references for non-NC machining revolving cutter with constant pitch and reducing the equipments input. 展开更多
关键词 revolving cutter constant pitch non-numerically controlled machining geometric model
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