scholarly journals Research on Spatial Positioning System of Fruits to be Picked in Field Based on Binocular Vision and SSD Model

2021 ◽  
Vol 1748 ◽  
pp. 042011
Author(s):  
Xing Zhang ◽  
Qiaoming Gao ◽  
Dong Pan ◽  
Peng Cheng Cao ◽  
Dong Hui Huang
Keyword(s):  
Binocular Vision ◽  
Positioning System ◽  
Spatial Positioning

Ultra-wide Field Infrared Binocular Vision Epipolar Constraint and Spatial Positioning

2019 ◽  
Vol 48 (2) ◽  
pp. 211003
Author(s):  
陈一超 CHEN Yi-chao ◽  
刘秉琦 LIU Bing-qi ◽  
黄富瑜 HUANG Fu-yu
Keyword(s):  
Binocular Vision ◽  
Wide Field ◽  
Epipolar Constraint ◽  
Spatial Positioning

Inexpensive spatial position system for the automation of inspection with mobile robots

2014 ◽  
Vol 41 (6) ◽  
pp. 508-517 ◽  
Author(s):  
Mohammed Abdullah Al Rashed ◽  
Tariq Pervez Sattar
Keyword(s):  
Mobile Robot ◽  
Complex Geometry ◽  
Measurement Unit ◽  
Positioning System ◽  
Destructive Testing ◽  
Wireless System ◽  
Content Type ◽  
Wireless Positioning ◽  
Spatial Positioning ◽  
Pulse Echo

Purpose – The purpose of this paper is to develop a wireless positioning system. The automation of non-destructive testing (NDT) of large and complex geometry structures such as aircraft wings and fuselage is prohibitively expensive, though automation promises to improve on manual ultrasound testing. One inexpensive way to achieve automation is by using a small wall-climbing mobile robot to move a single ultrasound probe over the surface through a scanning trajectory defined by a qualified procedure. However, the problem is to guide the robot though the trajectory and know whether it has followed it accurately to confirm that the qualified procedure has been carried out. Design/methodology/approach – The approach is to use sophisticated bulk electronics developed for game playing in combination with MATLAB to develop a wireless positioning system. Findings – The paper describes the development of an inexpensive wireless system comprising an optical spatial positioning system and inertial measurement unit that relates the 3D location of an NDT probe carried by a mobile robot to a computer-aided drawing (CAD) representation of the test structure in a MATLAB environment. The probe is located to an accuracy of ± 2 mm at distances of 5 m. Research limitations/implications – Positioning range is limited to 5 m. Further development is required to increase this range. Practical implications – The wireless system is used to develop tools to guide the robot remotely to follow a desired scanning trajectory, obtain feedback about the actual trajectory executed by the robot, know exactly where an ultrasound pulse echo was captured, map identified defects on the CAD and relate them to the real test object. Originality/value – An inexpensive spatial positioning system with sufficient accuracy for automated NDT purposes.

scholarly journals Spatial positioning of underwater components for Baikal- GVD

2019 ◽  
Vol 207 ◽  
pp. 07004 ◽  
Author(s):  
A.D. Avrorin ◽  
A.V. Avrorin ◽  
V.M. Aynutdinov ◽  
R. Bannash ◽  
I.A. Belolaptikov ◽  
...  
Keyword(s):  
Lake Baikal ◽  
Spatial Orientation ◽  
Reconstruction Error ◽  
Neutrino Telescope ◽  
Positioning System ◽  
Timing Error ◽  
Positioning Accuracy ◽  
Under Construction ◽  
Spatial Positioning

Baikal-GVD is a cubic kilometer-scale neutrino telescope currently under construction in Lake Baikal. The detector’s components are mobile and may drift from their initial coordinates or change their spatial orientation. This introduces a reconstruction error, particularly a timing error for PMT hits. This problem is mitigated by a combination of a hydroacoustic positioning system and per-component acceleration and orientation sensors. Under regular conditions, the average positioning accuracy for a GVD component is estimated to be less than 13 cm.

scholarly journals Distributed State Estimation for Dynamic Positioning Systems with Uncertain Disturbances and Transmission Time Delays

Complexity ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Li Liu ◽  
Tao Yao ◽  
Xin Hu ◽  
Chunjie Zhou ◽  
Dianli Hou ◽  
...  
Keyword(s):  
State Estimation ◽  
Time Delays ◽  
Transmission Time ◽  
Model Parameters ◽  
Dynamic Positioning ◽  
Positioning System ◽  
Selection Scheme ◽  
Positioning Systems ◽  
Uncertain Disturbances ◽  
Spatial Positioning

The dynamic positioning system of unmanned underwater vehicles (UUVs) is a complex and large-scale system mainly due to the nonlinear dynamics, uncertainty in model parameters, and external disturbances. With the aid of the bio-inspired computing (BIC) method, the designed three-dimensional (3D) spatial positioning system is used for enlarging communication constraints and increasing signal coordination processing. With the growing of measurement scales, the issue of the networked high-precision positioning has been developed rapidly. Then, an information fusion estimation approach is presented for the distributed networked systems with data random transmission time delays and lost and disordered packets. To reduce the communication burden, an adaptive signal selection scheme is employed to reorganize the measurement sequence, and the parameter uncertainties as well as cross-correlated noise are used to describe the uncertain disturbances. Moreover, a reoptimal weighted fusion state estimation is designed to alleviate the information redundancy and maintain higher measurement accuracy. An illustrative example obtained from the 3D spatial positioning system is given to validate the effectiveness of the proposed method.

Sign in / Sign up

Export Citation Format

Share Document