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相关概念视频

Adjusting a Traverse01:12

Adjusting a Traverse

56
In the site survey of a four-sided traverse, internal angles are essential to ensure geometric accuracy. The survey revealed that the sum of the measured internal angles was 359 degrees and 48 minutes, which is 12 minutes less than the expected 360 degrees. This discrepancy signals an error likely arising from measurement inaccuracies during the fieldwork.To rectify this error, the adjustment process involved distributing the 12-minute shortfall equally across the four internal angles. By...
56
Relative Motion Analysis using Rotating Axes-Problem Solving01:29

Relative Motion Analysis using Rotating Axes-Problem Solving

400
Consider a crane whose telescopic boom rotates with an angular velocity of 0.04 rad/s and angular acceleration of 0.02 rad/s2. Along with the rotation, the boom also extends linearly with a uniform speed of 5 m/s. The extension of the boom is measured at point D, which is measured with respect to the fixed point C on the other end of the boom. For the given instant, the distance between points C and D is 60 meters.
Here, in order to determine the magnitude of velocity and acceleration for point...
400
Types of Global Positioning System Surveys01:30

Types of Global Positioning System Surveys

55
GPS surveying methods vary in application, accuracy, and data collection techniques, catering to diverse surveying and mapping needs. Static GPS, kinematic GPS, and real-time kinematic (RTK) surveying are widely used. Each technique offers distinct advantages.Static GPS involves placing one receiver at a known reference point and another at the target point. It collects exact positional data by observing multiple satellite ranges over an extended period, achieving centimeter-level accuracy for...
55
Relative Motion Analysis using Rotating Axes - Acceleration01:22

Relative Motion Analysis using Rotating Axes - Acceleration

330
Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame. The absolute velocity of point B is determined by adding the absolute velocity of point A, the relative velocity of point B in the rotating frame, and the effects caused by the angular velocity within the rotating frame.
Time differentiation is...
330
Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

459
Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame.
However, to express the relative position of point B relative to point A, an additional frame of reference, denoted as x'y', is necessary. This additional frame not only translates but also rotates relative to the fixed frame, making it...
459

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恒星追踪器的动态精度测量方法使用时间同步的高精度转盘.

Rui Lu, Jianfu Zhang, Xing Han

    Applied optics
    |June 10, 2024
    PubMed
    概括

    一种新方法准确地测量了在动态条件下使用同步摇摆表和真实恒星的恒星追踪器性能. 这种方法通过提供可靠的轨道验证来提高卫星导航的准确性.

    科学领域:

    • 太空飞船态度的确定空间飞船的态度的确定
    • 导航系统工程 导航系统工程
    • 光学传感器测量仪表学

    背景情况:

    • 恒星追踪器对于航天器的态度控制至关重要,提供必要的导航数据.
    • 来自星球追踪器的不准确的态度信息可能导致重大导航错误和任务失败.
    • 实地验证恒星追踪器的准确性,特别是在动态条件下,是具有挑战性的.

    研究的目的:

    • 提出和验证一种用于在动态条件下测量恒星追踪器精度的新方法.
    • 为了克服高度动态的恒星追踪器地面测试的局限性.
    • 为了实现全面的性能验证,包括灵敏度和捕获概率.

    主要方法:

    • 利用高精度的同步摇摆台来模拟动态航天器运动.
    • 使用坐标转换来预测初始的星球追踪器态度.
    • 同步了摇摆桌,恒星追踪器和测试设备,以最大限度地减少系统错误.
    • 使用真正的导航恒星作为测量目标,与模拟恒星方法不同.

    主要成果:

    • 拟议的方法允许恒星追踪器以高达20°/s的角度速度保持追踪.
    • 由于持续跟踪,实现了更多足够的统计抽样点和可靠的结果.

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  • 使用真实恒星进行的测量非常接近轨道上的性能.
  • 在单个实验中成功验证了多个星球追踪器性能指标.
  • 结论:

    • 开发的精度测量方法对于在高度动态的条件下评估恒星追踪器是有效的.
    • 测试环境紧密复制轨道中的条件,满足严格的动态性能要求.
    • 这种方法提供了一种可靠的方法来验证恒星追踪器的准确性和性能.