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相关概念视频

Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

38
Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short...
38
Differential Leveling01:12

Differential Leveling

191
Differential leveling is a precise method in surveying used to determine the elevation difference between two points. Its primary goal is to establish accurate vertical measurements to create level surfaces or grade lines critical for designing and constructing infrastructures such as roads, bridges, and buildings.The procedure for differential leveling begins with setting up and leveling the instrument at a point where the benchmark can be seen. The level rod is held on the benchmark (BM), and...
191
Errors in Global Positioning System01:26

Errors in Global Positioning System

49
Global Positioning System (GPS) technology has revolutionized navigation and positioning, but its accuracy is often compromised by various errors. These errors, stemming from environmental, satellite, and receiver-related factors, require careful mitigation to ensure reliable performance across applications.Atmospheric ErrorsGPS signals travel through the Earth’s ionosphere and troposphere, introducing delays which affect accuracy. The ionosphere is strongly influenced by charged particles,...
49
Distance Measurements by Taping01:18

Distance Measurements by Taping

46
Tapes are essential in surveying for accurate, durable, and short-distance measurements. Made from lightweight, nylon-coated steel, they offer flexibility and strength for rugged outdoor use. The nylon coating protects against rust and wear, extending the tape's life. Standard lengths, around 30 meters, are marked in meters and millimeters for precision.Surveyors select tapes based on site conditions and accuracy needs. Lightweight, nylon-coated tapes are commonly used for ease of handling and...
46
Distance Corrections01:15

Distance Corrections

31
To achieve precise distance measurements, especially in surveying and construction, certain corrections must be applied to account for potential sources of error like the standardization errors, temperature variations, and slope adjustments.Standardization error emerges when measurement equipment undergoes changes, such as wear, repairs, or weather impacts. To address this, surveyors compare the equipment’s readings to a standard. This process identifies any deviation that might lead to...
31
Types of Global Positioning System Surveys01:30

Types of Global Positioning System Surveys

63
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...
63

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Microfluidic Platform with Multiplexed Electronic Detection for Spatial Tracking of Particles
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一个简单的方法来确定单接收器差异代码偏差,使用精确的定位点定位.

Fenkai Zhang1, Long Tang1, Jiaxing Li1

  • 1School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, China.

Sensors (Basel, Switzerland)
|October 14, 2023
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概括
此摘要是机器生成的。

一个新的精确点定位 (PPP) 模型准确地估计了单接收器差异代码偏差 (DCB). 这种方法改善了电离层测量并减少了误差,提供了一种更精确的方法来确定接收器DCB.

关键词:
从载体到代码的等级化不同代码偏差偏见差异化代码偏见精确的定位点定位精确的定位点定位.标准偏差的标准偏差

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科学领域:

  • 地测和地球物理学的地质学.
  • 太空天气 太空天气
  • 卫星导航 卫星导航 卫星导航 卫星导航

背景情况:

  • 差异代码偏差 (DCB) 是全球导航卫星系统 (GNSS) 测量中的一个重要错误来源.
  • 精确点定位 (PPP) 为高精度GNSS数据处理提供了一个强大的框架.
  • 准确估计接收器DCB对于电离层建模和精确定位至关重要.

研究的目的:

  • 提出一种新的,精确的单接收器差异代码偏差 (DCB) 估计方法.
  • 为了利用精确点定位 (PPP) 模型进行增强的电离层观测提取.
  • 验证拟议方法的性能与现有技术相比.

主要方法:

  • 使用PPP模型提取高精度的电离层观测,包括DCB,使用PPP模型.
  • 使用国际GNSS服务 (IGS) 产品的卫星DCB的校正.
  • 应用垂直总电子含量 (VTECmstd) 的最小化算法来确定接收器DCB.

主要成果:

  • 与 carried-to-code (CCL) 模型相比,大多数车站的 VTECmstd 值显著降低.
  • 在接受器DCB校正后,负电离层测量站的平均数量减少了40%.
  • 使用PPP模型估计的接收器DCB的平均误差大约减少0.6n.

结论:

  • 拟议的PPP基于的方法提供了更精确的估计接收器DCB.
  • 该方法提高了电离层测量的质量,并减少了定位错误.
  • 这种方法为高精度GNSS数据分析和电离层研究提供了有价值的工具.