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    • 2. 发明授权
    • GPS receiving system
    • GPS接收系统
    • US06480787B2
    • 2002-11-12
    • US09903744
    • 2001-07-13
    • Shoji YoshikawaKatsuhiko YamadaJun Tsukui
    • Shoji YoshikawaKatsuhiko YamadaJun Tsukui
    • G01C2100
    • G01S19/51B64G1/36G01S5/0072G01S19/23G01S19/52
    • A global positioning system (GPS) receiving system which achieves an equivalent synchronization in time measurement of GPS signals utilizing software without requiring highly accurate synchronization for receiver clocks with time information embedded in the GPS signals. The GPS receiving system performs a relative navigation process after correcting a pseudorange with a time tag error which is attributable to inaccuracy of receiver clocks of first and second moving objects. A relative navigation process correcting an absolute error of a time tag with a clock bias is also described. A differential computation unit calculates a difference between the first pseudorange and the second pseudorange commonized by the time tag commonizing unit. Correction in a time tag error correction unit is performed for the selected GPS data with a common GPS satellite identification number.
    • 一种全球定位系统(GPS)接收系统,其利用软件实现GPS信号的时间测量中的等效同步,而不需要在GPS信号中嵌入时间信息的接收机时钟的高精度同步。 GPS接收系统在利用可归因于第一和第二移动物体的接收器时钟的不准确的时间标签误差校正伪距之后执行相对导航处理。 还描述了用时钟偏差校正时间标签的绝对误差的相对导航处理。 差分计算单元计算第一伪距和由时间标签公用化单元公共的第二伪距之差。 对于具有公共GPS卫星识别号码的所选择的GPS数据执行时间标签误差校正单元的校正。
    • 3. 发明授权
    • Apparatus for determining attitude of artificial satellite
    • 用于确定人造卫星姿态的装置
    • US06523786B2
    • 2003-02-25
    • US09879918
    • 2001-06-14
    • Shoji YoshikawaKatsuhiko YamadaHaruhiko ShimojiMasao InoueNorimasa YoshidaKatsumasa Miyatake
    • Shoji YoshikawaKatsuhiko YamadaHaruhiko ShimojiMasao InoueNorimasa YoshidaKatsumasa Miyatake
    • B64G136
    • B64G1/361B64G2001/245
    • An apparatus for determining the attitude of an artificial satellite by narrowing attitude candidates to a correct one in a short time. The apparatus has star sensors, a star catalog data base, star identification sections in each of which star images output from the star sensors are collated with a star catalog with respect to each star sensor to output a group of corresponding candidates, attitude computation sections for computing a value of an attitude candidate of the artificial satellite with respect to each corresponding candidate, an attitude updating section for updating the value of the attitude candidate on the basis of the star images output from the star sensor and the star catalog, and an attitude propagation section for computing the value of the attitude candidate at the present sampling time from the value of the attitude candidate at the preceding sampling time and the artificial satellite's angular velocity. An attitude candidate unification section for comparing and combining the values of attitude candidates into one candidate is provided in a loop including the attitude updating section and the attitude propagation section.
    • 一种用于通过在短时间内将姿态候选缩小到正确的姿态来确定人造卫星的姿态的装置。 该装置具有星形传感器,星型目录数据库,星型识别部分,其中从星形传感器输出的星形图像与星形传感器相关的星形目录进行整理,以输出一组相应的候选者,姿态计算部分用于 计算人造卫星相对于每个相应候选人的姿态候选的值,姿态更新部分,用于基于从星形传感器和星形目录输出的星形图像来更新姿态候选者的值,以及姿态 传播部分,用于根据前一采样时间的姿态候选值和人造卫星的角速度计算当前采样时间的姿态候选值。 在姿态更新部和姿态传播部的回路中设置用于将姿态候选的值进行比较和组合成一个候选的姿态候补统一部。
    • 4. 发明授权
    • Attitude determination system for artificial satellite
    • 人造卫星姿态确定系统
    • US6102338A
    • 2000-08-15
    • US919193
    • 1997-08-28
    • Shoji YoshikawaKatsuhiko YamadaHiroshi SakashitaHiroo Yonechi
    • Shoji YoshikawaKatsuhiko YamadaHiroshi SakashitaHiroo Yonechi
    • G01C21/24B64G1/24B64G1/28B64G1/36G01C21/02G05D1/08
    • G05D1/0883B64G1/24B64G1/288B64G1/361G01C21/025B64G1/36
    • An attitude determination system for an artificial satellite capable of performing star identification without need for the aid of ground station includes an image processing module (17) for processing star images observed at predetermined time points by a star sensor (16) mounted on the artificial satellite (1) for arithmetically determining direction vectors of the observed stars, a rotation estimating module (18) for estimating a rotational motion of the artificial satellite (1) between an attitude of the artificial satellite at a predetermined time point and an attitude of the artificial satellite at another time point, an elongation estimating module (19) for estimating elongations between the direction vectors of plural stars the images of which are picked up at a same time point by the star sensor and estimating the elongations between the direction vectors of plural stars the images of which are picked up at different time points by the star sensor on the basis of the estimated rotational motion, a star identifying module (20) for establishing correspondences between a plurality of the stars for which relation of the elongation has been determined and stars on a star catalog for identifying the stars, and an attitude angle estimating module (21) for estimating an attitude angle of the artificial satellite on the basis of result of identification of the stars.
    • 能够在不需要地面站的帮助下进行星型识别的人造卫星的姿势确定系统包括:图像处理模块(17),用于处理在预定时间点由安装在人造卫星上的星形传感器(16)观察到的星形图像 (1),用于对所述观测星的方向矢量进行算术确定;旋转估计模块,用于估计所述人造卫星在预定时间点的姿态与人造卫星的姿态之间的旋转运动; 卫星在另一个时间点,延伸率估计模块(19),用于估计多个恒星的方向向量之间的延伸,其中图像由星形传感器在同一时间点被拾取并且估计多个恒星的方向向量之间的伸长 其基于估计的星形传感器在不同时间点拾取图像 旋转运动的星形识别模块(20),用于在已经确定了伸长关系的多个星星之间建立对应关系,并且用于识别恒星的星形目录上的恒星;以及姿态角估计模块(21),用于估计 人造卫星的姿态角基于星星识别的结果。
    • 5. 发明授权
    • Attitude determination system for artificial satellite
    • 人造卫星姿态确定系统
    • US06227496B1
    • 2001-05-08
    • US09610603
    • 2000-07-05
    • Shoji YoshikawaKatsuhiko YamadaHiroshi SakashitaHiroo Yonechi
    • Shoji YoshikawaKatsuhiko YamadaHiroshi SakashitaHiroo Yonechi
    • B64G136
    • G05D1/0883B64G1/24B64G1/288B64G1/36B64G1/361G01C21/025
    • An attitude determination system for an artificial satellite capable of performing star identification without need for the aid of ground station includes an image processing module (17) for processing star images observed at predetermined time points by a star sensor (16) mounted on the artificial satellite (1) for arithmetically determining direction vectors of the observed stars, a rotation estimating module (18) for estimating a rotational motion of the artificial satellite (1) between an attitude of the artificial satellite at a predetermined time point and an attitude of the artificial satellite at another time point, an elongation estimating module (19) for estimating elongations between the direction vectors of plural stars the images of which are picked up at a same time point by the star sensor and estimating the elongations between the direction vectors of plural stars the images of which are picked up at different time points by the star sensor on the basis of the estimated rotational motion, a star identifying module (20) for establishing correspondences between a plurality of the stars for which relation of the elongation has been determined and stars on a star catalog for identifying the stars, and an attitude angle estimating module (21) for estimating an attitude angle of the artificial satellite on the basis of result of identification of the stars.
    • 能够在不需要地面站的帮助下进行星型识别的人造卫星的姿势确定系统包括:图像处理模块(17),用于处理在预定时间点由安装在人造卫星上的星形传感器(16)观察到的星形图像 (1),用于对所述观测星的方向矢量进行算术确定;旋转估计模块,用于估计所述人造卫星在预定时间点的姿态与人造卫星的姿态之间的旋转运动; 卫星在另一个时间点,延伸率估计模块(19),用于估计多个恒星的方向向量之间的延伸,其中图像由星形传感器在同一时间点被拾取并且估计多个恒星的方向向量之间的伸长 其基于估计的星形传感器在不同时间点拾取图像 旋转运动的星形识别模块(20),用于在已经确定了伸长关系的多个星星之间建立对应关系,并且用于识别恒星的星形目录上的恒星;以及姿态角估计模块(21),用于估计 人造卫星的姿态角基于星星识别的结果。
    • 9. 发明授权
    • Autoconfiguration system for wireless sensor network and its method, and gateway apparatus for wireless sensor network
    • 无线传感器网络自动配置系统及其方法,无线传感器网络网关设备
    • US08942212B2
    • 2015-01-27
    • US12622051
    • 2009-11-19
    • Katsuhiko Yamada
    • Katsuhiko Yamada
    • H04W4/00H04W48/14H04W40/24H04W80/04
    • H04W48/14H04W40/24H04W80/04
    • The present invention enables connection between a wireless sensor node and a service server while reducing load on the wireless sensor node.The wireless sensor node transmits a router solicitation message to a gateway apparatus; the gateway apparatus analyzes the message to extract the discrete information of a device or service, searches for a service server based on such information and acquires the configuration information necessary for execution of a service application of the wireless sensor node; the gateway apparatus multicasts the received router solicitation message into a link; a router within the link receives the router solicitation message, and multicast a router advertisement message which contains the prefix information of an address, etc. into a link; the gateway apparatus sets the acquired configuration information in the router advertisement message and transfers the resultant message to the wireless sensor node; and the wireless sensor node analyzes the message.
    • 本发明能够在减少无线传感器节点上的负载的同时,实现无线传感器节点与服务服务器之间的连接。 无线传感器节点向网关设备发送路由器请求消息; 网关设备分析消息以提取设备或服务的离散信息,基于这样的信息搜索服务服务器,并获取执行无线传感器节点的服务应用所需的配置信息; 网关设备将接收的路由器请求消息多播到链路中; 链路内的路由器接收路由器请求消息,并将包含地址等的前缀信息的路由器通告消息组播到链路中; 网关装置将所获取的配置信息设置在路由器通告消息中,并将所得到的消息传送到无线传感器节点; 无线传感器节点分析消息。