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Related Concept Videos

Azimuths and Bearings01:19

Azimuths and Bearings

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Azimuths and bearings are essential concepts in surveying, providing methods to express the direction of a line relative to a meridian. Azimuths refer to the clockwise angle measured from the north end of a reference meridian to the given line, ranging from zero to 360 degrees. This method gives a comprehensive directional reference within a full 360-degree circle, making it a straightforward way to communicate direction in various fields, including navigation, cartography, and...
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Design Example: Traverse Angle Computations01:25

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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...
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Relative Motion Analysis using Rotating Axes-Problem Solving01:29

Relative Motion Analysis using Rotating Axes-Problem Solving

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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.
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Derivatives of Inverse Trigonometric Functions01:30

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A ship tracking an approaching aircraft relies on geometric measurements to find out the aircraft’s position relative to the observer. By measuring the slant distance to the aircraft and the angle of elevation, the horizontal and vertical components of the distance can be obtained using trigonometric relationships. This geometric approach provides a basis for analyzing how the observed angle changes as the aircraft moves closer to the ship.To examine the mathematical behavior of the angle...
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Adjusting a Traverse01:12

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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...
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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.
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Related Experiment Video

Updated: Mar 7, 2026

Design and Application of a Fault Detection Method Based on Adaptive Filters and Rotational Speed Estimation for an Electro-Hydrostatic Actuator
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An Improved Azimuth Angle Estimation Method with a Single Acoustic Vector Sensor Based on an Active Sonar Detection

Anbang Zhao1,2, Lin Ma3,4, Xuefei Ma5,6

  • 1College of Underwater Acoustic Engineering, Harbin 150001, China. zhaoanbang@hrbeu.edu.cn.

Sensors (Basel, Switzerland)
|February 24, 2017
PubMed
Summary
This summary is machine-generated.

This study introduces an improved azimuth angle estimation method using a single acoustic vector sensor (AVS) for active sonar detection. The new approach offers high precision and better performance than conventional methods with reduced computational complexity.

Keywords:
active sonar detection systemazimuth angle estimationcomplex acoustic intensity measurementmatched filteringsingle AVStime-domain processing

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Area of Science:

  • Acoustics
  • Signal Processing
  • Sonar Technology

Background:

  • Conventional passive sonar methods for azimuth estimation rely on complex acoustic intensity measurements.
  • Accurate azimuth angle estimation is crucial for effective active sonar detection systems.
  • Existing methods may involve complex frequency-domain operations and higher computational load.

Purpose of the Study:

  • To propose an improved azimuth angle estimation method utilizing a single acoustic vector sensor (AVS).
  • To enhance the precision and performance of azimuth estimation in active sonar systems.
  • To reduce computational complexity compared to conventional techniques.

Main Methods:

  • The proposed method is based on matched filtering theory.
  • A detailed mathematical and physical model of the new method is presented.
  • The approach uses a single acoustic vector sensor (AVS).

Main Results:

  • Computer simulations and lake experiments demonstrate high-precision azimuth angle estimation.
  • The proposed method shows superior estimation performance compared to conventional techniques.
  • The method avoids complex frequency-domain operations, leading to reduced computational complexity.

Conclusions:

  • The improved azimuth angle estimation method using a single AVS is effective for active sonar.
  • The proposed technique offers a high-precision, computationally efficient alternative to conventional methods.
  • This advancement has significant implications for the performance of sonar detection systems.