iGPS Measurement Network Multi-Station Arrangement Design

2013 ◽  
Vol 443 ◽  
pp. 223-227 ◽  
Author(s):  
Na Zhou ◽  
Zhi Yong An ◽  
Li Juan Li ◽  
Yun Zhu
Keyword(s):  
Measurement Accuracy ◽  
Measurement Unit ◽  
Baseline Length ◽  
Position Tracking ◽  
Test Results ◽  
Simulation Design ◽  
Intersection Angle ◽  
Optimal Arrangement ◽  
Accuracy Requirement ◽  
Measurement Principle

In order to meet the measurement accuracy requirement of some patrol device iGPS position tracking experiment, the most rational, economic configuration and optimal arrangement of iGPS are needed to find. It presented the iGPS dual-transmitter measurement principle based on non-coplanar intersection principle, and also their uncertainty analysis. From the measurement unit of iGPS networkthe dual-transmitter measurement uncertainty simulation results, the relations between measurement accuracy and the intersection angle, azimuth angle, pitch angle and baseline length are studied, which provides a reference for arrangement of multi-transmitter of iGPS. The iGPS multi-transmitter arrangement simulation design of some patrol device iGPS position tracking experiment is put forward. The calibration test results show that: the measurement accuracy of station arrangement design is less than 0.4mm, and satisfied the experiment requirement.

An Algorithm to Eliminate Stochastic Jump Measurements of Ultrasonic Flow-Meter with Time Difference Method

2011 ◽  
Vol 267 ◽  
pp. 414-421
Author(s):  
Qiang Liu ◽  
Rang Ding Wang ◽  
Ying Zhu ◽  
Cheng Tou Du
Keyword(s):  
Measurement Accuracy ◽  
Time Difference ◽  
Test Results ◽  
Flow Meter ◽  
Newton Interpolation ◽  
Improve Measurement ◽  
Measurement Results ◽  
Stochastic Jump ◽  
Ultrasonic Flow Meter ◽  
Measurement Principle

This article describes the time difference ultrasonic flow meter measurement principle, by analyzing the ultrasonic flow meter test results, using the theory of Newton interpolation correction calibration constants, solves the problems that the measurement results will suddenly appear more random beating and further improve measurement accuracy of the ultrasonic flow meter.

scholarly journals Integrated GNSS/IMU-Gyrocompass with Rotating IMU. Development and Test Results

2020 ◽  
Vol 12 (22) ◽  
pp. 3736
Author(s):  
Gennadiy Emel’yantsev ◽  
Oleg Stepanov ◽  
Aleksey Stepanov ◽  
Boris Blazhnov ◽  
Elena Dranitsyna ◽  
...  
Keyword(s):  
Inertial Measurement Unit ◽  
Fiber Optic ◽  
Measurement Unit ◽  
Prototype Model ◽  
Navigation Satellite ◽  
Test Results ◽  
Rotating Platform ◽  
Inertial Measurement ◽  
Urban Conditions ◽  
The Given

The paper presents the developed integrated GNSS/IMU gyrocompass which, unlike the existing systems, contains a single-axis rotating platform with two antennas installed on it and an inertial measurement unit with tactical grade fiber-optic gyros. It is shown that the proposed design provides attitude solution by observing the signals of only one navigation satellite. The structure of the integrated GNSS/IMU gyrocompass, its specific features and prototype model used in the tests are described. The given test results in urban conditions confirmed heading determination accurate to ±1.5° (3σ).

Multi-DMEs for alternative position, navigation and timing (A-PNT)

2021 ◽  
pp. 1-21
Author(s):  
Xiao Liang ◽  
Carl Milner ◽  
Christophe Macabiau ◽  
Philippe Estival
Keyword(s):  
Global Navigation Satellite System ◽  
Measuring Equipment ◽  
Measurement Accuracy ◽  
Satellite System ◽  
Navigation Satellite ◽  
Test Results ◽  
Reference Area ◽  
Alternative Position ◽  
Alternate Source ◽  
Global Navigation Satellite

Abstract Distance measuring equipment (DME/DME) as the main reversionary method provides alternative positioning, navigation and timing (A-PNT) services for use during a Global Navigation Satellite System (GNSS) outage. Considering the geometry limitation of DME/DME, multi-DMEs with better geometry can be used to increase the accuracy and integrity performance of positioning. This paper discusses the opportunities and challenges related to use of multi-DMEs as an alternate source of positioning, navigation and timing. To support the performance for A-PNT, the basic idea is considering the existing installed equipment. In this paper, barometer altimeter and TACAN are used to help improve the performance of A-PNT provided by multi-DMEs both in accuracy and integrity. Based on the database of EUROCONTROL, the test results demonstrate that 79⋅7% of a reference area roughly matching with the continental European locations achieve RNP 1 using multi-DMEs when the DME measurement accuracy is 0⋅2 NM (95%). When the DME measurement accuracy is 0⋅1 NM (95%), 87⋅9% of the reference area can achieve RNP 1 using multi-DMEs. The usage of barometer/TACAN measurements aided multi-DMEs improves the performance of the accuracy and integrity monitoring.

scholarly journals Modeling the Influence of Dust-Removing Extraction Fan’S Parameters on the Dust Control Effects in the Tunnel

2016 ◽  
Vol 5 (2) ◽  
pp. 18 ◽  
Author(s):  
Qingguo Wang ◽  
Deming Wang ◽  
Hetang Wang
Keyword(s):  
Cfd Simulation ◽  
Dust Control ◽  
Test Results ◽  
Ventilation Mode ◽  
Forced Ventilation ◽  
Migration Process ◽  
Optimal Arrangement ◽  
Air Supply ◽  
Mechanized Tunnelling ◽  
Migration Law

<p class="emsd"><a name="OLE_LINK1"></a><span lang="EN-GB">In the process of comprehensive mechanized tunnelling in coal mines, forced ventilation is usually adopted to supply air in China. But this ventilation mode could cause the dust rise and diffuse more easily, which has threaten the mine workers’ health seriously. To solve this problem, </span><a name="OLE_LINK8"></a><span lang="EN-GB">dust-removing extraction fan</span><span lang="EN-GB"> is generally used to suck and purify dusty air in mines. However, the optimal arrangement scheme for dust control is rarely systematically studied. In this paper, we took the tunnel in Donghuantuo Mine as an example and use CFD simulation technology to analyze the dust migration law and dust control effects under different conditions. An unsteady state solution is used to simulate the process and the simulation have realized the visualization of dust migration process with time and the results are as follows. Firstly, it’s better for dust control to <a name="OLE_LINK15"></a>arrange the inlet of the dust-removing extraction fan to the air return side rather than to the center of the tunnel. Secondly, the dust control effects decrease with the distance between inlet of the dust-removing extraction fan and heading face increases. Thirdly, as the amount of air suction is larger than air supply, the dust control efforts would get worse. Field test results are similar <a name="OLE_LINK9"></a>with that obtained from simulation under the optimal arrangement, which proves the reliability of simulation.</span></p>

Dynamic Measurement of Bearing Radial Clearances

2005 ◽  
Vol 295-296 ◽  
pp. 361-366 ◽  
Author(s):  
Yu Xue Chen ◽  
S.N. Yang
Keyword(s):  
Measurement Accuracy ◽  
Systematic Errors ◽  
Dynamic Measurement ◽  
Outer Ring ◽  
Radial Clearance ◽  
Test Time ◽  
Ball Bearings ◽  
Test Results ◽  
Accuracy Measures

Outer ring tilted or offset axially, caused by improperly fixing relatively to the inner ring, will produce remarkable systematic errors in measured radial clearance of a bearing. Analyzing their effects in detail on the results of measured radial clearances, they are found to be the main sources affecting the measurement accuracy. Measures for removing them are proposed. Based on these, a novel type of instrument for measurement of radial clearances of ball bearings has been developed. It could avoid the two kinds of systematic errors. The measuring principle, structures and working procedures of the instrument are presented. Test results show that the test time is less than 15 seconds per a part and the indication stability is between ±1.0 µm.

A Novel Kind of Turbidity Sensor and its Measurement Method

2012 ◽  
Vol 424-425 ◽  
pp. 1253-1257
Author(s):  
Xing Qiao Liu ◽  
Peng Zhang
Keyword(s):  
Measurement Accuracy ◽  
Test Results ◽  
Measurement Circuit ◽  
The Core ◽  
On Line ◽  
New Type ◽  
The Impact ◽  
Sensor Probe ◽  
Easy Operation ◽  
Higher Sensitivity

In this paper, the scattering measuring principle of turbidity is introduced firstly. The new type of turbidity sensor probe designed in this paper overcomes the deficiencies of existing technologies, which has higher sensitivity, strong anti-interference and can detect the turbidity accurately and continuously. The system designed with the core of MCU C8051F020 is presented. Then the design of turbidity sensor probe, data acquisition, processing and non-linear compensation are introduced in detail. Besides, in order to eliminate the impact of temperature on the turbidity measurement and improve the measurement accuracy, temperature measurement circuit has been designed. Test results have shown that the designed on-line turbidity-meter has some advantages: low price, high precision, easy operation etc. It can be widely applied in the fields of waterworks, industrial production, aquaculture, environmental protection and so on

A Design of MIMU/GPS Integrated Navigation System

2013 ◽  
Vol 278-280 ◽  
pp. 1719-1722 ◽  
Author(s):  
Xiao Yu Zhang ◽  
Chun Lei Song
Keyword(s):  
Navigation System ◽  
Inertial Measurement Unit ◽  
High Performance ◽  
Inertial Navigation System ◽  
Measurement Unit ◽  
Integrated Navigation ◽  
Test Results ◽  
Simulation Test ◽  
Integrated Navigation System ◽  
Navigation Algorithm

A new scheme of small integrated navigation system based on micro inertial measurement unit (MIMU), global position system (GPS) is presented. The characteristic of these sensors and the structure of system are introduced respectively. The TI high performance floating point DSP TMS320C6713B is used as core processor, which is designed to realize both the data collecting and the navigation calculating. According to the error models of inertial navigation system, an integrated navigation algorithm used Kalman filter is proposed to fuse the information from all of the sensors. The simulation test results show the feasibility of the system design.

scholarly journals Method to Evaluate the Resistance–Capacitance Voltage Divider and Uncertainty Analysis

Energies ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 7744
Author(s):  
Yi Luo ◽  
Bin Guo ◽  
Bin Qian ◽  
Lijuan Xu ◽  
Fan Zhang ◽  
...  
Keyword(s):  
Uncertainty Analysis ◽  
Measurement Errors ◽  
Measurement Accuracy ◽  
Dielectric Breakdown ◽  
Voltage Divider ◽  
Test Results ◽  
Term Operation ◽  
Economic Significance ◽  
Capacitance Voltage

The resistance and capacitance parameters of a resistance–capacitance divider may change due to factors such as long-term operation, internal insulation flashover, and dielectric breakdown, which will affect the measurement characteristics of the resistance–capacitance divider. Since it is difficult to separate the voltage divider, and because improper disassembly will damage the insulation of the equipment, measuring the resistance and capacitance parameters of a voltage divider non-destructively has always been a problem. In this paper, an indirect method for evaluating the resistance and capacitance parameters is proposed, and the uncertainty of measurement of this method is determined. Simulation and actual test results show that this method can be used to estimate the resistance–capacitance parameters and has a good level of measurement accuracy. Besides, through the uncertainty analysis, it is concluded that the proposed method can overcome measurement errors within a certain range and has high practicability. Finally, a very practical application scenario of the proposed method is given, showing that the proposed method has good economic significance.

scholarly journals SIMULATION OF DIRECT GEOREFERENCING FOR GEOMETRIC SYSTEMATIC CORRECTION ON LSA PUSHBROOM IMAGER

2017 ◽  
Vol 14 (1) ◽  
pp. 71
Author(s):  
Muchammad Soleh ◽  
Wismu Sunarmodo ◽  
Ahmad Maryanto
Keyword(s):  
Inertial Measurement Unit ◽  
Remote Sensing Data ◽  
Image Data ◽  
Measurement Unit ◽  
Array Detector ◽  
Ground Sample ◽  
Accuracy Requirement ◽  
Systematic Correction ◽  
Measurement Results ◽  
Camera Sensor

LAPAN has developed remote sensing data collection by using a pushbroom linescan imager camera sensor mounted on LSA (Lapan Surveillance Aircraft). The position accuracy and orientation system for LSA applications are required for Direct Georeferencing and depend on the accuracy of off-the-shelf integrated GPS/inertial system, which used on the camera sensor. This research aims to give the accuracy requirement of Inertial Measurement Unit (IMU) sensor and GPS to improve the accuracy of the measurement results using direct georeferencing technique. Simulations were performed to produce geodetic coordinates of longitude, latitude and altitude for each image pixel in the imager pushbroom one array detector, which has been geometrically corrected. The simulation results achieved measurement accuracies for mapping applications with Ground Sample Distance (GSD) or spatial resolution of 0,6 m of the IMU parameter (pitch, roll and yaw) errors about 0.1; 0.1; and 0.1 degree respectively, and the error of GPS parameters (longitude and latitude) about 0.00002 and 0.2 degree. The results are expected to be a reference for a systematic geometric correction to image data pushbroom linescan imager that would be obtained by using LSA spacecraft.

scholarly journals MECHANIZATION DEVICES FOR HANDLING BRANCHES IN MODERN ORCHARDS

2021 ◽  
pp. 293-302
Author(s):  
Hui Li ◽  
Xin Yang ◽  
Aiqian Yang
Keyword(s):  
Practical Experience ◽  
Labor Cost ◽  
Motion Trajectory ◽  
Test Results ◽  
Simulation Design ◽  
Practice Test ◽  
The Core ◽  
Simulated Test ◽  
Influencing Parameters ◽  
Lower Height

In most parts of China, pruned branches in orchards are still treated manually. In order to reduce the intensity and labor cost, this paper provides a mechanical solution for branches collection, which mainly includes the gathering device, picking device, and smashing device. A simulation platform with a human-computer interaction was developed in Matlab. It can set optimization goals based on human practical experience and optimize the main influencing parameters, and both the gathering device and the picking device achieve the design simulation on this platform. Furthermore, this method helps to quickly obtain the data of key components in the core device. Firstly, the shape of the Slide-way shell of the gathering device can be obtained quickly through different gathering ranges. Secondly, a group of angle and motion trajectory of the picking device with lower height was obtained from the simulation design. Furthermore, the performance of the improved picking device under four different laying conditions was tested. The results showed that, under R=38-42 r/min and V=0.80-0.95 m/s, the success rate of the picking device was 94.2%, 92.5%, 61.0% and 30.8%, respectively. The field test demonstrated that there are no significant differences between the simulated test results and practice test results.

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