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相关概念视频

Area Computation by the Alternative Coordinate Method01:24

Area Computation by the Alternative Coordinate Method

89
The alternative coordinate method, also known as the Shoelace Formula, is a technique for determining the area of a traverse using Cartesian coordinates. This method relies on the sequential arrangement of x and y coordinates for each point of the shape, ensuring accuracy and ease of application.In this approach, each corner's x and y coordinates are listed as fractions, with the x-coordinate as the numerator and the y-coordinate as the denominator. These coordinates are arranged sequentially...
89
Design Example: Traverse Angle Computations01:25

Design Example: Traverse Angle Computations

112
Traverse angle computations are a critical component of surveying, used to compute the internal angles within a closed traverse. A traverse consists of a series of connected lines forming a closed loop, often used for land boundary delineation or mapping. Calculating the internal angles ensures accuracy in the traverse geometry and is essential for checking survey data integrity.The process begins with known azimuths and bearings of the traverse sides. Internal angles at each vertex are...
112
Adjusting a Traverse01:12

Adjusting a Traverse

86
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...
86
Latitudes and Departures01:27

Latitudes and Departures

152
Latitudes and departures are essential concepts in surveying, providing a systematic way to analyze the projections of traverse lines. These projections allow surveyors to interpret a line's north-south and east-west components, which are crucial for precisely calculating areas, bearings, and lengths. Latitude is the north-south projection of a line, calculated as the product of the line's length and the cosine of its bearing. Departure, conversely, is the east-west projection obtained by...
152
One-Compartment Open Model: Wagner-Nelson and Loo Riegelman Method for ka Estimation01:24

One-Compartment Open Model: Wagner-Nelson and Loo Riegelman Method for ka Estimation

587
This lesson introduces two critical methods in pharmacokinetics, the Wagner-Nelson and Loo-Riegelman methods, used for estimating the absorption rate constant (ka) for drugs administered via non-intravenous routes. The Wagner-Nelson method relates ka to the plasma concentration derived from the slope of a semilog percent unabsorbed time plot. However, it is limited to drugs with one-compartment kinetics and can be impacted by factors like gastrointestinal motility or enzymatic degradation.
On...
587
Design Example: Marking Boundaries of a Site Using a Compass01:12

Design Example: Marking Boundaries of a Site Using a Compass

64
Marking site boundaries using a compass is a precise surveying technique that ensures the accuracy of boundary delineation. The process begins by using provided site details, including the bearings and lengths of each boundary line. The initial step involves calculating latitudes and departures for all sides of the site. This computation verifies that the traverse is free of errors, ensuring a closed and accurate boundary.The process starts at a known point, such as Point A, which is often...
64

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相关实验视频

Updated: Jul 27, 2025

Tracking Infiltration Front Depth Using Time-lapse Multi-offset Gathers Collected with Array Antenna Ground Penetrating Radar
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无孔嵌套阵列与三个子ULA来指导到达估计方向.

Yule Zhang1, Guoping Hu2, Hao Zhou2

  • 1Graduate College, Air Force Engineering University, Xi'an 710051, China.

Sensors (Basel, Switzerland)
|June 10, 2023
PubMed
概括

这项研究引入了一种新的无孔嵌套阵列 (NA-TS),用于改进到达方向 (DOA) 估计. 拟议的数组比现有方法提供了更多的自由度 (DOF),提高了稀疏数组的性能.

关键词:
自由度的自由度的自由度.差异共同数组的差异.抵达方向估计的方向.有三个子ULA的无孔嵌套阵列.稀疏数组数组是一个稀疏的数组.

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科学领域:

  • 信号处理 信号处理
  • 阵列信号处理 阵列信号处理
  • 电磁学 电磁学 电磁学 电磁学

背景情况:

  • 稀疏阵列能够识别超过传感器数量的源.
  • 无孔差异共同阵列 (DCAs) 提供了很大的自由度 (DOF).
  • 现有的嵌套数组在DOF中存在局限性.

研究的目的:

  • 提出一个新的无孔嵌套数组,其中有三个亚统一的线条数组 (NA-TS).
  • 分析拟议的NA-TS的配置和DOF.
  • 展示到达方向 (DOA) 的优越估计性能.

主要方法:

  • 开发了一种新的无孔嵌套阵列配置 (NA-TS).
  • 为最佳配置和DOFs.衍生闭式表达式.
  • 使用1D和2D表示来进行详细分析.
  • 将NA-TS与现有的无孔嵌套阵列进行比较.

主要成果:

  • 详细介绍了NA-TS配置,以嵌套数组 (NA) 和改进的嵌套数组 (INA) 为特殊情况.
  • NA-TS 的 DOF 是传感器计数和第三个亚统线阵列 (sub-ULA) 的函数.
  • 与之前提出的无孔嵌套阵列相比,NA-TS提供了更多的DOF.
  • 数字示例证实了NA-TS的优越DOA估计性能.

结论:

  • 拟议的NA-TS是稀疏数组的有效配置.
  • NA-TS提供了增强的DOF,对于先进的DOA估计至关重要.
  • 新型阵列设计在识别多个来源方面带来了卓越的性能.