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相关概念视频

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During leveling, the Earth's curvature and atmospheric refraction introduce deviations in the line of sight from a true horizontal reference. When the line of sight is leveled, it remains perpendicular to the plumb line only at a single point. Beyond this, it deviates due to the Earth’s curvature, represented by the correction C. For a sight distance D, the deviation can be derived using the relationship:This relationship shows that the deviation increases quadratically with distance. Over a...
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Topography involves measuring and mapping land elevations, natural features, and artificial structures to create accurate representations of the terrain. Topographic surveying relies on traditional and modern methods, each with distinct advantages and limitations.Traditional Surveying Methods:Transit stadia surveys and plane table surveys were widely used traditional surveying methods. These techniques relied on instruments like theodolites and stadia rods for measuring distances and angles,...
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Updated: Jan 16, 2026

In Situ Soil Moisture Sensors in Undisturbed Soils
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使用GNSS-IR进行土壤湿度检索的基于波纹的海拔角度选择方法.

Xilong Kou1, Yan Zhou1, Qian Chen1

  • 1College of Information Science and Engineering, Shandong Agricultural University, Tai'an 271018, China.

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|September 27, 2025
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概括
此摘要是机器生成的。

本研究介绍了全球导航卫星系统干涉度反射计 (GNSS-IR) 土壤水分监测的适应方法. 新方法通过自动选择最佳卫星升高角度来提高准确性,优于固定间隔.

关键词:
在GNSS-IR中使用GNSS.选择升高角度的选择.土壤水分 土壤水分波形小波形电波,就是一个波形电波.

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科学领域:

  • 遥感 遥感 遥感 遥感
  • 地质物理学 地质物理学
  • 信号处理 信号处理

背景情况:

  • 全球导航卫星系统干涉度反射计 (GNSS-IR) 是一种低成本,高精度的土壤湿度监测技术.
  • 在GNSS-IR中,固定升高角度间隔难以适应变化的卫星信号特征.
  • 准确的土壤湿度检索依赖于从卫星信号中有效地提取特征参数.

研究的目的:

  • 为GNSS-IR土壤湿度检索开发一种适应的升高角度间隔选择方法.
  • 通过优化卫星信号分析,提高土壤湿度监测的准确性.
  • 为了解决固定升高角度间隔在适应各种卫星信号时的局限性.

主要方法:

  • 波段变换用于分析残余信号对噪声比 (SNR) 信号的时间频率特征.
  • 计算主要频率组件强度与噪声组件强度的比率序列.
  • 设置了一个值,自动确定每个卫星的最佳检索升高角度间隔.

主要成果:

  • 与传统的固定间隔 (5-20°和5-30°) 相比,拟议的自适应方法显著提高了土壤水分检索的准确性.
  • 使用算法选择的间隔的平均相位特征参数产生了0.925的R2和0.55%的RMSE,改进了原始结果的3.1%和14.2%.
  • 对于低质量的反射区域,R2增加了13.2% (0.728到0.839) 和RMSE减少了22.9% (1.045到0.806).

结论:

  • 适应性方法有效地调整到不同反射区的信号质量减弱.
  • 这一策略优化了GNSS-IR土壤湿度检索的高度角度间隔选择.
  • 开发的技术提高了基于遥感的土壤湿度监测的可靠性和精度.