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相关概念视频

Design Example: Identifying the Locations of Monuments in the Field Using Global Positioning System Device01:30

Design Example: Identifying the Locations of Monuments in the Field Using Global Positioning System Device

27
Surveyors use Global Positioning System (GPS) technology to measure the precise location and elevation of points on Earth. In a recent survey, GPS receivers were used to determine the coordinates and elevations of two park monuments. The process involved careful mission planning, data collection, and correction to ensure accuracy. The survey began with mission planning to identify optimal satellite visibility and minimize Position Dilution of Precision (PDOP). A geodetic control point...
27
Field Application of Global Positioning System01:28

Field Application of Global Positioning System

42
The Global Positioning System (GPS) has become an indispensable tool in fieldwork, offering unparalleled precision and efficiency for surveying, navigation, and infrastructure development. By harnessing signals from a constellation of satellites, GPS receivers determine the location of objects with remarkable speed and accuracy, often completing calculations within a second.Advantages of Modern GPS TechnologyContemporary GPS receivers are designed to meet the practical demands of field...
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Introduction to Global Positioning System01:30

Introduction to Global Positioning System

55
The Global Positioning System (GPS) revolutionized positioning on Earth, providing precise location data through satellite ranging. The GPS system was developed in 1978 by the U.S. Department of Defense  for military use, and it became available for civilian applications in 1983, transforming fields including navigation, fleet management, and time synchronization for telecommunications systems.GPS consists of satellites in medium Earth orbit, about 20,200 kilometers above the surface,...
55
Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

590
The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
590

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相关实验视频

Updated: Jun 24, 2025

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
08:39

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空间激光通信系统象限探测器上的点位图.

Jia Wei, Huishi Zhu, Yuehui Wang

    Applied optics
    |June 10, 2024
    PubMed
    概括

    本研究介绍了一种适应式插值细分 (AIS) 算法,用于空间激光通信中准确的点位定位. 该方法通过简单的操作提高了准确性,优化了卫星系统的性能.

    科学领域:

    • 光学和光子学 在光学和光子学.
    • 太空技术 太空技术
    • 光学通信系统 光学通信系统

    背景情况:

    • 太空激光通信需要高效,准确的定位系统.
    • 有限的内置计算能力和内存限制了算法的复杂性.
    • 四象限探测器对于光学系统中精确的光束对齐至关重要.

    研究的目的:

    • 开发一个计算效率高的点定位方法,用于太空激光通信.
    • 为了提高点位定位的准确性,使用四象限探测器.
    • 评估拟议方法对卫星应用的性能和适用性.

    主要方法:

    • 使用四象限探测器进行初始点检.
    • 实现一个自适应式插值细分 (AIS) 算法,以适应理论位置曲线.
    • 在AIS算法中使用线性运算以提高计算效率.
    • 进行现场接收和定位系统的模拟和实验验证.

    主要成果:

    • 适应式插位细分 (AIS) 算法在象限探测器的中心区域显示出更高的定位准确性.
    • 模拟和实验结果证实了拟议方法的有效性.
    • 定位精度在系统的稳定通信区内最高.

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  • 该方法通过简单的计算操作实现了高精度.

    • 结论:

    • 拟议的点定位方法非常适合用于太空激光通信,因为它的准确性和操作简单性.
    • 这种方法节约了宝贵的计算资源,从而提高了通信性能.
    • 该系统提供了一个实用的解决方案,用于在苛刻的太空环境中精确的光束对齐.