scholarly journals Evaluation of Distance Measurement Accuracy by Odometer for Pipelines Pigs

2006 ◽  
Vol 49 (1) ◽  
pp. 38-42 ◽  
Author(s):  
Sergiy Sadovnychiy ◽  
Juan López ◽  
Volodymyr Ponomaryov ◽  
Andriy Sadovnychyy
Keyword(s):  
Measurement Accuracy ◽  
Distance Measurement

scholarly journals The Impact of Radar Distance Measurement Accuracy on the Accuracy of Position Fixing in VTS Systems

2018 ◽  
Vol 25 (3) ◽  
pp. 5-13
Author(s):  
Krzysztof Czaplewski ◽  
Sambor Guze ◽  
Sławomir Świerczyński
Keyword(s):  
Measurement Accuracy ◽  
Distance Measurement ◽  
Large Vessel ◽  
Monitoring Systems ◽  
Gross Error ◽  
Radar Echo ◽  
The Impact ◽  
Source Of Information ◽  
Large Vessels ◽  
Made In

Abstract The main source of information on the situation across the sea basins used by operators of shipping monitoring systems is a network of coastal radar stations. Presently, it is possible to gather navigational information from many individual radar stations simultaneously, which may be used for improving the accuracy of vessel position fixing. However, without making other estimates, we obtain an inconsistent image comprising multiple echoes of the same ship, and as such it is impossible to say which echo presents the vessel on the move. Another problem is the method of performing radar observations, which significantly affects the accuracy of position fixing. The estimated radar distance is encumbered with a gross error in the case of large vessels, as the position of a large vessel is not the same as the position of the edge of the radar echo to which the estimation is made. In this paper, the authors present a method to adjust the measured radar distance. The proposed method may be automated easily, which would significantly enhance VTS positioning processes.

scholarly journals Evaluation of Distance Measurement Accuracy by Odometer for Pipelines Pigs

2006 ◽  
Vol 49 (1) ◽  
pp. 038-042 ◽  
Author(s):  
Sergiy Sadovnychiy ◽  
Juan López ◽  
Volodymyr Ponomaryov ◽  
Andriy Sadovnychyy
Keyword(s):  
Measurement Accuracy ◽  
Distance Measurement

Improve a 3D distance measurement accuracy in stereo vision systems using optimization methods’ approach

2017 ◽  
Vol 25 (1) ◽  
pp. 24-32 ◽  
Author(s):  
J.C. Rodríguez-Quiñonez ◽  
O. Sergiyenko ◽  
W. Flores-Fuentes ◽  
M. Rivas-lopez ◽  
D. Hernandez-Balbuena ◽  
...  
Keyword(s):  
Stereo Vision ◽  
Measurement Accuracy ◽  
Optimization Methods ◽  
Distance Measurement ◽  
Vision Systems

scholarly journals LAND UNMANNED COMPLEX WITH PASSIVE RANGE MEASUREMENT

2021 ◽  
pp. 11-16
Author(s):  
Volodymyr I. Mikitenko ◽  
Volodymyr M. Senatorov ◽  
Anatolii Gurnovych
Keyword(s):  
Measurement Method ◽  
Measurement Accuracy ◽  
Vision System ◽  
Distance Measurement ◽  
Measuring Channel ◽  
Wide Field ◽  
Range Finder ◽  
Fixed Base ◽  
Movement Parameters ◽  
Base Range

The automatic robotic complex will obviously become one of the main subjects in the conduct of military actions in the near future. To control movement parameters, as well as search, target detection and aiming, the complex includes a technical vision system. The minimum sufficient configuration of such a system includes a television search camera with a wide field of view, television and thermal imaging sights, and a rangefinder. The use of laser rangefinders ensures high accuracy of aiming weapons, but generates a powerful unmasking feature. To ensure the secrecy of the functioning of the robotic complex, range finders can operate in a passive mode using information from on-board television cameras. But at the same time, the metrological characteristics of the information measuring channel are significantly deteriorated. Accuracy of five methods of passive distance measurement with application of TV-systems of land unmanned complex is assessed in paper. Classic method of TV-sight external-base range-finder with scale, designed on human height 1,65 m, is ensuring measurement accuracy 135 m on distance 1000 m. External base method, when a range finger scale is forming on remote display as variable length vertical line in process of target framing, is ensuring measurement accuracy 100,3 m on dis-tance 1000 m. Fixed-base range-finder method, when distance between entrance pupils of TV-sight and wide viewing field camera using as base, is ensuring measurement accuracy 76 m on distance 1000 m.  Distance measurement method due to displacement of land unmanned complex ensures a measurement accuracy up to 168 m on distance 1000 m. Measurement method due to using zoom-objective is not suitable for land unmanned complex. Proposals have been formulated for the spatial layout of the computer vision system, in which the method of the fixed-base rangefinder is implemented, which ensures the highest measurement accuracy.

Kovalev passive rangefinder

2021 ◽  
Vol 969 (3) ◽  
pp. 12-18
Author(s):  
S.V. Kovalev ◽  
D.A. Shapovalov
Keyword(s):  
Measurement Accuracy ◽  
Distance Measurement ◽  
Optical Path ◽  
Optical Scheme ◽  
Acceptable Error ◽  
Technical Result ◽  
Laser Range Finders ◽  
Digital Methods ◽  
Field Works ◽  
Photo Receiver

The authors present the results of longtime research on the development and improvement of a passive geodetic rangefinder based on the inbasis method of distance measurement. Actually, active laser range finders are not always effective at field works. An original compact optical scheme of a passive rangefinder based on a theodolite telescope and a mould photo receiver with application of digital methods for coordinate calculation is proposed. The distance and dimensions of the object are defined. The former is identified by the shift between the images on the horizontal axis. The merit of such a system is the absence of mechanical displacements. Its main advantage is an extremely simple optical path. The technical result is reduction in overall dimensions and weight, while maintaining an acceptable error in the passive range measurement. The use of Kovalev passive rangefinder is promising at performing geodetic measurements with total stations. There is also a description of the rangefinder sample as well as the calculations results according to the distance measurement accuracy.

scholarly journals Study of the Error Caused by Camera Movement for the Stereo-Vision System

2021 ◽  
Vol 11 (20) ◽  
pp. 9384
Author(s):  
Yan Liu ◽  
Zhendong Ge ◽  
Yingtao Yuan ◽  
Xin Su ◽  
Xiang Guo ◽  
...  
Keyword(s):  
Stereo Vision ◽  
Measurement Accuracy ◽  
Rotation Angle ◽  
Vision System ◽  
Distance Measurement ◽  
3D Measurement ◽  
Relative Rotation ◽  
Distance Error ◽  
Stereo Vision System ◽  
Coordinate Error

The stereo-vision system plays an increasingly important role in various fields of research and applications. However, inevitable slight movements of cameras under harsh working conditions can significantly influence the 3D measurement accuracy. This paper focuses on the effect of camera movements on the stereo-vision 3D measurement. The camera movements are divided into four categories, viz., identical translations and rotations, relative translation and rotation. The error models of 3D coordinate and distance measurement are established. Experiments were performed to validate the mathematical models. The results show that the 3D coordinate error caused by identical translations increases linearly with the change in the positions of both cameras, but the distance measurement is not affected. For identical rotations, the 3D coordinate error introduced only in the rotating plane is proportional to the rotation angle within 10° while the distance error is zero. For relative translation, both coordinate and distance errors keep linearly increasing with the change in the relative positions. For relative rotation, the relationship between 3D coordinate error and rotation angle can be described as the nonlinear trend similar to a sine-cosine curve. The impact of the relative rotation angle on distance measurement accuracy does not increase monotonically. The relative rotation is the main factor compared to other cases. Even for the occurrence of a rotation angle of 10°, the resultant maximum coordinate error is up to 2000 mm, and the distance error reaches 220%. The results presented are recommended as practice guidelines to reduce the measurement errors.

scholarly journals EXAMINATION METHOD OF THE EFFECT OF THE INCIDENCE ANGLE OF LASER BEAM ON DISTANCE MEASUREMENT ACCURACY TO SURFACES WITH DIFFERENT COLOUR AND ROUGHNESS

2016 ◽  
Vol 22 (3) ◽  
pp. 420-436 ◽  
Author(s):  
Karol Daliga ◽  
Zygmunt Kurałowicz
Keyword(s):  
Laser Beam ◽  
Measurement Method ◽  
Measurement Accuracy ◽  
Incidence Angle ◽  
Distance Measurement ◽  
Distance Measurements ◽  
Total Station ◽  
Examination Method ◽  
Critical Incidence ◽  
Reflective Foil

Interest in the influence of the incidence angle of a laser beam to distance measurements can be seen in many areas of science and technology: geodesy, glaciology, archaeology, machine automation, and others. This paper presents results of measurements of the effect of the incidence angle of a laser beam to distance measurements to the surfaces of different colour and roughness by Topcon's electro-optical total station with an accuracy of 3 mm. Measurement method and the method of elimination of test stand errors are presented. The results of measurements have been analysed and the influence of selected factors (surface colour and roughness, lack of instrument rectification) on the distance measurement have been discussed. It is also shown the critical incidence angle above which it can be impossible to measure distances to reflective foil with tested total station

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