High-precision laser spot center positioning method for weak light conditions

The high-precision roll attitude estimation of the decoupled canards relative to the projectile body based on the bipolar hall-effect sensors is proposed. Firstly, the basis engineering positioning method based on the edge detection is introduced. Secondly, the simplified dynamic relative roll model is established where the feature parameters are identified by fuzzy algorithms, while the high-precision real-time relative roll attitude estimation algorithm is proposed. Finally, the trajectory simulations and grounded experiments have been conducted to evaluate the advantages of the proposed method. The positioning error is compared with the engineering solution method, and it is proved that the proposed estimation method has the advantages of the high accuracy and good real-time performance.

Download Full-text

Autocorrelation Phase Measurement of Spread Spectrum Signal for High Precision Indoor Microwave Positioning

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.734.31 ◽

2015 ◽

Vol 734 ◽

pp. 31-39

Author(s):

Wen Yang Cai ◽

Gao Yong Luo

Keyword(s):

High Precision ◽

Spread Spectrum ◽

Phase Measurement ◽

Wide Band ◽

Cost Effective ◽

Local Area ◽

Indoor Positioning ◽

60 Ghz ◽

Positioning Method ◽

Increasing Demand

The increasing demand for high precision indoor positioning in many public services has urged research to implement cost-effective systems for a rising number of applications. However, current systems with either short-range positioning technology based on wireless local area networks (WLAN) and ZigBee achieving meter-level accuracy, or ultra-wide band (UWB) and 60 GHz communication technology achieving high precision but with high cost required, could not meet the need of indoor wireless positioning. This paper presents a new method of high precision indoor positioning by autocorrelation phase measurement of spread spectrum signal utilizing carrier frequency lower than 1 GHz, thereby decreasing power emission and hardware cost. The phase measurement is more sensitive to the distance of microwave transmission than timing, thus achieving higher positioning accuracy. Simulation results demonstrate that the proposed positioning method can achieve high precision of less than 1 centimeter decreasing when various noise and interference added.

Download Full-text

High Precision Indoor Positioning Method Based on UWB

Ad Hoc Networks - Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering ◽

10.1007/978-3-030-37262-0_16 ◽

2019 ◽

pp. 201-207

Author(s):

Janyong Yan ◽

Donghai Lin ◽

Kai Tang ◽

Guangsong Yang ◽

Qiubo Ye

Keyword(s):

High Precision ◽

Indoor Positioning ◽

Positioning Method

Download Full-text

A New System for Measuring Bridge Deflections Based on Laser Imaging Process

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.143-144.211 ◽

2011 ◽

Vol 143-144 ◽

pp. 211-215 ◽

Cited By ~ 2

Author(s):

Fang Cui ◽

Yun Fei Wang

Keyword(s):

Measuring System ◽

Laser Spot ◽

Zoom Lens ◽

Steel Bridge ◽

Laser Imaging ◽

Spot Center ◽

Measuring Bridge ◽

Center Location ◽

Dial Test ◽

New System

A new system for measuring bridge deflections based on laser imaging process is introduced. Firstly, principle of this system is analyzed with geometrical optics theory. Secondly, hardwares of measuring system are illuminated in detail, and the key software problems are discussed, including laser spot center location and accurate control of motorized TV zoom lens. The laser spot center location is realized by using image fuzzy edge extraction algorithm and Hough transform algorithm. The accurate control of motorized TV zoom lens' motors is realized by using a control-driving card based on ISA bus. At last, the contrastive experiments are operated on a certain continuous steel bridge with this system and dial test indicator. The experimental results show that this system is equal precision with dial test indicator, and can get over defects of traditional measuring methods. The security and reliability is much higher relatively and the precision can match to the engineering requirement.

Download Full-text