scholarly journals Integrated High-Accuracy Correction Technology of Radio-Wave Refraction for Deep-Space (High-Orbit) Targets

Atmosphere ◽  
2021 ◽  
Vol 12 (9) ◽  
pp. 1151
Author(s):  
Kun Liu ◽  
Zhigang Yuan ◽  
Chen Zhou ◽  
Qinglin Zhu ◽  
Haining Wang ◽  
...  
Keyword(s):  
Error Correction ◽  
Radio Wave ◽  
Elevation Angle ◽  
High Accuracy ◽  
Deep Space ◽  
Wave Refraction ◽  
High Orbit ◽  
And Control ◽  
Measurement And Control ◽  
Refraction Error

The radio-wave refraction error caused by the troposphere and ionosphere badly affects accuracy in terms of the navigation, positioning, measurement, and control of a target; it is the main source of errors in high-accuracy measurement and control systems. The high-accuracy technology needed for radio-wave refraction error correction (mainly in the troposphere and ionosphere) has been the focus of research for a long time. At present, the correction methods used for radio-wave refraction errors have a low accuracy. For an S-band radio-wave signal, the accuracy of refraction error correction can generally only reach m-level (elevation angle of 15° and above), and thus has difficulty meeting the requirements of dm-level accuracy refraction error correction for deep-space and high-orbit targets. To improve the accuracy of radio-wave refraction error correction for deep-space and high-orbit targets, a novel correction method for tropospheric and ionospheric range error due to refraction is proposed in this study, on the basis of the measured data from a water vapor radiometer and dual-frequency Global Navigation Satellite System (GNSS). The comprehensive calibration test is conducted in combination with the Chinese Area Positioning System (CAPS) in Kunming. Results show that this method can effectively correct the range error due to refraction that is caused by the troposphere and ionosphere. For an S-band radio-wave signal, the accuracy of refraction error correction can reach dm-level accuracy (elevation angle of 15° and above), which is 50% higher than that achieved with traditional methods. This work provides an effective support system for major projects, such as lunar exploration and Mars exploration.

scholarly journals Helicopter Training Simulator Measurement and Control System Based on Computer Simulation Technology

2021 ◽  
Vol 2143 (1) ◽  
pp. 012011
Author(s):  
He Li ◽  
Gang Zou ◽  
Lin Li ◽  
Dehui Yu
Keyword(s):  
Control System ◽  
Simulation Training ◽  
Elevation Angle ◽  
Computer Software ◽  
Simulation Technology ◽  
Training Simulator ◽  
Measurement And Control System ◽  
Software Technology ◽  
And Control ◽  
Measurement And Control

Abstract With the development of computer software technology and simulation technology, simulation training has been widely used. Helicopter training simulation has become an important part of helicopter training, and its status is becoming more and more important. On the one hand, the air mechanic is responsible for the maintenance and organization of the helicopter during the flight, and on the other hand is responsible for the starting and stopping of the helicopter engine, the operation of related equipment, and the handling of emergencies during the flight. The simulation training has the characteristics of high training efficiency, convenient maintenance and low training cost. It will become an important means for helicopter air mechanics to troubleshoot and deal with special situations. This paper aims to study the helicopter training simulator measurement and control system based on computer software technology. Based on the analysis of the advantages of the simulator instead of the actual installation for training, the helicopter training simulator function and the simulator subsystem, the actual installation simulation instrument and signal are designed. The indicator light, the graphic instrument and the control signal are arranged in the circuit, and then the simulation experiment is carried out on the design. The experimental results show that the design can more accurately simulate the indication of the antenna elevation angle table, which meets the requirements of this article.

The Research of Round Raster Readheads Scheme

2012 ◽  
Vol 468-471 ◽  
pp. 2282-2286
Author(s):  
Jun Feng Cong
Keyword(s):  
Angular Displacement ◽  
High Accuracy ◽  
Measuring Instrument ◽  
Cnc Machine ◽  
Precise Location ◽  
Machining Center ◽  
Testing Technology ◽  
Configuration Scheme ◽  
And Control ◽  
Measurement And Control

The round raster is extensively applied in all kinds of high accuracy angular displacement measurement and control system.With the development of precise mechanotronics measuring instrument, machining center, CNC machine and various precise location testing technology, a higher request is put forward to the accuracy and the function of raster measurement system. In this article it is concluded that double readheads is the most reasonable configuration scheme through tests of single readhead scheme,two readheads and four readheads.

Research on Data Acquisition System of Ship Measurement and Control Device Check Equipment

2012 ◽  
Vol 591-593 ◽  
pp. 1242-1246
Author(s):  
Hai Yan Yu ◽  
Hai Bo Meng ◽  
Qi Song ◽  
Tian Yong Deng
Keyword(s):  
Data Acquisition ◽  
Data Acquisition System ◽  
High Accuracy ◽  
Control Device ◽  
Functional Modules ◽  
Input Output ◽  
Industrial Control ◽  
Parameter Measuring ◽  
And Control ◽  
Measurement And Control

Ship measurement and control device check equipment has realized the intelligent check of ship measurement and control device’s functional modules which have the function of parameter measuring, data acquisition, calculation, communication and power supply.It need to complete multiple parameters’data acquisition and operation above all, this paper introduces the process of data acquisition and operation of industrial control computer’s PCI cards by using VC program. The PCI cards include PCI-1713,PCI-1724,PCI-1758UDI,PCI-1758UDO,PCI-1612CU.It realizes the data acquisition and operation of industrial control computer’s analog input\output PCI cards,digital input\output PCI cards and communication PCI card. It completes the data acquisition function of check equipment. it satisfys the need of realtime and high accuracy of check equipment,it can used to other data acquisition systems.

The Technology of Positional Detection in Automatic Wheelset Assembly Machine

2012 ◽  
Vol 184-185 ◽  
pp. 595-598
Author(s):  
Jun Xiao ◽  
Xin Cheng ◽  
Rong Fang ◽  
Jian Bin Han
Keyword(s):  
Control Systems ◽  
Real Time ◽  
Production Efficiency ◽  
Position Control ◽  
High Accuracy ◽  
Position Measurement ◽  
And Control ◽  
Measurement And Control ◽  
Improve Production Efficiency

This paper introduces a kind of position measurement and control systems in automatic wheelset assembly machine. This system adopts direct close-loop position control in the process of pressing and real time monitor position of wheel and axle with high accuracy. Compared with traditional wheelset assembly machine, it can improve production efficiency and ensure the quality of pressing through control the distance between backs of wheel flange and the position difference of two wheels accurately.

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