scholarly journals A radio navigation angle measurement method with entangled microwave signals

AIP Advances ◽  
2018 ◽  
Vol 8 (6) ◽  
pp. 065217 ◽  
Author(s):  
X. Li ◽  
D. W. Wu ◽  
T. L. Wei ◽  
Q. Miao ◽  
H. N. Zhu ◽  
...  
Keyword(s):  
Measurement Method ◽  
Angle Measurement ◽  
Radio Navigation ◽  
Microwave Signals

scholarly journals Accuracy in Determining Aircraft Position by Terrestrial Radio Navigation

2021 ◽  
Vol vm02 (is02) ◽  
pp. 49-56
Author(s):  
Chingiz Hajiev ◽  
Alper Mehdi Sametoglu
Keyword(s):  
Measurement Method ◽  
Angle Measurement ◽  
Distance Measurement ◽  
Position Determination ◽  
Radio Navigation ◽  
Aircraft Flight ◽  
Position Errors ◽  
Accurate Position ◽  
Distance Difference ◽  
Determination Methods

The main objective of terrestrial radio navigation is position determination. In this study, the accuracy of the distance measurement, distance difference measurement, and integrated angle measurement/distance measurement terrestrial radio navigation methods is investigated. in order to calculate the position errors, simulations for the aircraft flight dynamics were carried out, and the obtained position values were compared with the actual values. The aircraft position determination methods were evaluated in the sense of accuracy. The position determination method with better accuracy was determined by comparing the absolute errors of the examined methods. Simulation and error analysis shows that the distance difference method is superior and gives more accurate position results. It was observed that the distance measurement method errors were smaller than the errors of the integrated angle measurement/distance measurement method.

scholarly journals An Optical Frequency Domain Angle Measurement Method Based on Second Harmonic Generation

Sensors ◽  
2021 ◽  
Vol 21 (2) ◽  
pp. 670
Author(s):  
Wijayanti Dwi Astuti ◽  
Hiraku Matsukuma ◽  
Masaru Nakao ◽  
Kuangyi Li ◽  
Yuki Shimizu ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Second Harmonic Generation ◽  
Frequency Domain ◽  
Harmonic Generation ◽  
Measurement Method ◽  
Second Harmonic ◽  
Angle Measurement ◽  
Laser Source ◽  
Optical Frequency ◽  
Measurable Range

This paper proposes a new optical angle measurement method in the optical frequency domain based on second harmonic generation with a mode-locked femtosecond laser source by making use of the unique characteristic of the high peak power and wide spectral range of the femtosecond laser pulses. To get a wide measurable range of angle measurement, a theoretical calculation for several nonlinear optical crystals is performed. As a result, LiNbO3 crystal is employed in the proposed method. In the experiment, the validity of the use of a parabolic mirror is also demonstrated, where the chromatic aberration of the focusing beam caused the localization of second harmonic generation in our previous research. Moreover, an experimental demonstration is also carried out for the proposed angle measurement method. The measurable range of 10,000 arc-seconds is achieved.

A high-precision roll angle measurement method

Optik ◽  
2015 ◽  
Vol 126 (24) ◽  
pp. 4837-4840 ◽  
Author(s):  
Zhai Yusheng ◽  
Zhang Zhifeng ◽  
Su Yuling ◽  
Wang Xinjie ◽  
Feng Qibo
Keyword(s):  
High Precision ◽  
Measurement Method ◽  
Angle Measurement ◽  
Roll Angle

Study on Harmonic Analysis and Error Correction in Synchro to Digital Conversion

2011 ◽  
Vol 225-226 ◽  
pp. 334-337 ◽  
Author(s):  
Yan Liu ◽  
Ze Gang Ye
Keyword(s):  
Harmonic Analysis ◽  
Error Correction ◽  
Measurement Method ◽  
Angle Measurement ◽  
Conversion Process ◽  
Matlab Simulation ◽  
Angle Error ◽  
Digital Conversion ◽  
Current Implementation ◽  
Improve Accuracy

The current implementation of the synchro to digital conversion (SDC) can not directly detect harmonic which can cause the problem of low precision angle measurement. To improve accuracy of angle, harmonic interference was analyzed and summarized in the axis-angle to digital conversion process. Through detailed research, a new angle measurement formula is proposed in this paper, this formula can be very good for angle error correction and compensation. In order to meet the practical requirements, a software measurement method based on FFT algorithm of harmonic analysis and error correction is put forward. Matlab simulation shows that the formula and method is effective and feasible.

Research on angle measurement method of monopulse SAR

2015 ◽  
Author(s):  
Zengliang Li Zengliang Li ◽  
Xin Zhao Xin Zhao ◽  
Huadong Zhang Huadong Zhang
Keyword(s):  
Measurement Method ◽  
Angle Measurement

Design and Precision Analysis of Muzzle Angle Measurement System

2011 ◽  
Vol 128-129 ◽  
pp. 1378-1381
Author(s):  
Jian Ping Zhou ◽  
Xiao Yun Wu ◽  
Peng Fei Zhang ◽  
Guo Hua Gu
Keyword(s):  
Light Source ◽  
Measurement System ◽  
Measurement Method ◽  
Angle Measurement ◽  
Measurement Technology ◽  
Optical Range ◽  
Precision Analysis ◽  
Traditional Methods ◽  
Two Dimension ◽  
New System

The traditional muzzle angle measurement method measured by optical range quadrant can’t satisfy the demand. A muzzle angle auto-measurement method based on collimation light source and PSD two-dimension sensors is provided. Adopted by the auto-measurement technology, the precision, efficiency and velocity of measurement are all improved, which solves the problems of traditional methods. The errors and precision of the new system are analyzed. According these analysis and calculation, the precision of this measurement system can gain the measurement ends.

Research on Measurement Method of Rotational Angle of Plane Rudder Based on ADXL345 Sensor

2014 ◽  
Vol 556-562 ◽  
pp. 3124-3128
Author(s):  
Quan Fa Yang ◽  
Gui Rong Ye ◽  
Chang You Li
Keyword(s):  
Measurement Method ◽  
Maximum Error ◽  
Angle Measurement ◽  
Coordinate Space ◽  
Acceleration Sensor ◽  
Transformation Theory ◽  
Rotational Angle ◽  
Space Transformation ◽  
Mathematical Expressions ◽  
Inclination Angles

A measurement method based on digital MEMS’ acceleration sensor is proposed. The paper analyzes the working principle of capacitive acceleration sensor. According to the coordinate space transformation theory, a mathematical model of the measurement method was built, and the mathematical expressions of the angle displacement of aircraft rudder was deduced; A measurement system of aircraft tail wing inclined was established using MEMS’ acceleration ADXL345, and taken STM32 as controller. Setting different angles in 3D turntable and aiming at a typical inclination angles, the aircraft tail rotation angle experiment was simulated, and experiment achieved angle measurement arranging from-90°-90°. Experiment results demonstrate that when the inclination is close to the real inclination of aircraft tail wing, the maximum error is 0.277°, less than 0.3°, which meets the requirement of measurement. For aircraft currently being used, the measurement method can achieve the angle measurement of aircraft tail wing rotating effectively.

High resolution and stability roll angle measurement method for precision linear displacement stages

2017 ◽  
Vol 88 (2) ◽  
pp. 023102 ◽  
Author(s):  
Tao Jin ◽  
Guizheng Xia ◽  
Wenmei Hou ◽  
Yanfen Le ◽  
Sen Han
Keyword(s):  
High Resolution ◽  
Measurement Method ◽  
Angle Measurement ◽  
Linear Displacement ◽  
Roll Angle
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