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    • 3. 发明授权
    • Satellite signal multipath mitigation in GNSS devices
    • GNSS设备中的卫星信号多路径减轻
    • US08717233B2
    • 2014-05-06
    • US13301633
    • 2011-11-21
    • Javad AshjaeeMikhail Gribkov
    • Javad AshjaeeMikhail Gribkov
    • G01S19/42G01S19/22
    • G01S19/22G01S19/28G01S19/35
    • A method for mitigating the effects of multipath errors in GNSS devices is provided. Signals from GNSS satellites are received. Image data from an image sensor is received. Orientation data from an orientation sensor is received. The orientation data describes the orientation of the image sensor. Obstruction data is determined based on the image data. The obstruction data includes an obstruction region that indicates the sky in that region is obstructed by a structure. Based on the orientation data, obstruction data, and GNSS satellite location data, the position of GNSS satellites with respect to the obstruction region is determined. The location of the GNSS device is determined based on signals from some of the GNSS satellites and the position of GNSS satellites with respect to the obstruction region.
    • 提供了一种减轻GNSS设备中多路径错误影响的方法。 接收来自GNSS卫星的信号。 接收来自图像传感器的图像数据。 接收来自定位传感器的定向数据。 方向数据描述图像传感器的方向。 根据图像数据确定障碍物数据。 障碍物数据包括指示在该区域被结构阻挡的天空的阻塞区域。 基于取向数据,障碍物数据和GNSS卫星定位数据,确定GNSS卫星相对于阻塞区域的位置。 基于来自一些GNSS卫星的信号和GNSS卫星相对于阻塞区域的位置来确定GNSS设备的位置。
    • 4. 发明申请
    • GNSS SURVEYING RECEIVER WITH MULTIPLE RTK ENGINES
    • 具有多台RTK发动机的GNSS检测接收机
    • US20120256788A1
    • 2012-10-11
    • US13437366
    • 2012-04-02
    • Javad ASHJAEELev B. RAPOPORT
    • Javad ASHJAEELev B. RAPOPORT
    • G01S19/40
    • G01S19/43G01S19/40G01S19/421
    • The position of a global navigation satellite system (GNSS) surveying receiver is determined based on a plurality of RTK engines. A first RTK engine is implementing using a first set of parameters. A second RTK engine is implemented using a second set of parameter different than the first set. A plurality of GNSS signals are received from multiple satellites. At least one correction signal is received from at least one base receiver. A first position is determined from the first RTK engine based on the GNSS signals and the at least one correction signal. A second position is determined from the first RTK engine based on the GNSS signals and the at least one correction signal. A final position of the GNSS surveying receiver is determined based on the first position or the second position or a combination of both positions.
    • 基于多个RTK引擎来确定全球导航卫星系统(GNSS)测量接收机的位置。 第一个RTK引擎正在使用第一组参数来实现。 使用与第一组不同的第二组参数来实现第二RTK引擎。 从多个卫星接收多个GNSS信号。 从至少一个基站接收机接收至少一个校正信号。 基于GNSS信号和至少一个校正信号,从第一RTK引擎确定第一位置。 基于GNSS信号和至少一个校正信号,从第一RTK引擎确定第二位置。 基于第一位置或第二位置或两个位置的组合来确定GNSS测量接收器的最终位置。
    • 7. 发明授权
    • Methods and systems for improvement of measurement efficiency in surveying
    • 测量测量效率提高的方法和系统
    • US06633256B2
    • 2003-10-14
    • US09938781
    • 2001-08-24
    • Alexey Vladislavovich ZhdanovJavad Ashjaee
    • Alexey Vladislavovich ZhdanovJavad Ashjaee
    • G01S502
    • G01S19/22G01C15/00G01S19/44
    • Methods and systems for measuring coordinates of a target, particularly under strong multipath conditions, are described. A satellite navigation system antenna and a tilt sensor are mounted on a range pole, with the sensor at the pole's bottom tip. Signals from the antenna and tilt sensor are provided to a receiver, which computes the antenna's coordinates from the antenna signals, and the pole tips position from the computed coordinates and the tilt data. The operator places the pole tip on the target and swings the pole by hand over an angle sector of 15 degrees while keeping the tip on the target. Height of the target can be computed with a single measurement set, and X-Y coordinates with just three measurement sets. The use of additional measurements reduces errors in the target's coordinates since multipath errors are uncorrelated during movement of the antenna. Vertical alignment of the pole is unnecessary.
    • 描述了用于测量目标的坐标的方法和系统,特别是在强多径条件下。 卫星导航系统天线和倾斜传感器安装在距离极上,传感器位于极底部。 来自天线和倾斜传感器的信号被提供给接收机,其从天线信号计算天线的坐标,并从所计算的坐标和倾斜数据计算极点位置。 操作者将极尖放置在目标上,并用手将杆倾斜15度的角度,同时将尖端保持在目标上。 目标的高度可以用单个测量集来计算,而X-Y坐标只有三个测量集。 使用额外的测量可减少目标坐标系中的误差,因为天线移动期间多径误差不相关。 杆的垂直对齐是不必要的。