High precision laser ranging by combining phase method and multi-cycle pulse method

2011 ◽  
Author(s):  
Xiaojun Wu ◽  
Ailing Zhang ◽  
Zhengrong Tong ◽  
Ye Cao
Keyword(s):  
High Precision ◽  
Pulse Method ◽  
Phase Method ◽  
Laser Ranging ◽  
Cycle Pulse

Vision-based target point tracking and aiming method

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Xiao Bo Liang ◽  
Xinghua Qu ◽  
YuanJun Zhang ◽  
Lianyin Xu ◽  
Fumin Zhang
Keyword(s):  
Standard Deviation ◽  
Target Tracking ◽  
High Precision ◽  
Visual Tracking ◽  
Laser Ranging ◽  
Content Type ◽  
Mean Error ◽  
Wide Range ◽  
The Mean ◽  
Correlation Filtering

Purpose Laser absolute distance measurement has the characteristics of high precision, wide range and non-contact. In laser ranging system, tracking and aiming measurement point is the precondition of automatic measurement. To solve this problem, this paper aims to propose a novel method. Design/methodology/approach For the central point of the hollow angle coupled mirror, this paper proposes a method based on correlation filtering and ellipse fitting. For non-cooperative target points, this paper proposes an extraction method based on correlation filtering and feature matching. Finally, a visual tracking and aiming system was constructed by combining the two-axis turntable, and experiments were carried out. Findings The target tracking algorithm has an accuracy of 91.15% and a speed of 19.5 frames per second. The algorithm can adapt to the change of target scale and short-term occlusion. The mean error and standard deviation of the center point extraction of the hollow Angle coupling mirror are 0.20 and 0.09 mm. The mean error and standard deviation of feature points matching for non-cooperative target were 0.06 mm and 0.16 mm. The visual tracking and aiming system can track a target running at a speed of 0.7 m/s, aiming error mean is 1.74 pixels and standard deviation is 0.67 pixel. Originality/value The results show that this method can achieve fast and high precision target tracking and aiming and has great application value in laser ranging.

A Fast and High-Precision Pulse Laser Ranging Method Based on Cursor Principle

2019 ◽  
Vol 46 (5) ◽  
pp. 0510001
Author(s):  
黄民双 Huang Minshuang ◽  
关在辉 Guan Zaihui
Keyword(s):  
Pulse Laser ◽  
High Precision ◽  
Laser Ranging

scholarly journals An Improved Partial Discharge Detection System Based on UV Pulses Detection

Sensors ◽  
2020 ◽  
Vol 20 (17) ◽  
pp. 4767
Author(s):  
Zeliang Shen ◽  
Jingang Wang ◽  
Gang Wei
Keyword(s):  
High Precision ◽  
Reliable Method ◽  
Pulse Current ◽  
Detection System ◽  
Partial Discharge ◽  
Current Method ◽  
Pulse Method ◽  
Early Discharge ◽  
Effective Distance ◽  
Pulse Detection

Partial discharge (PD) usually reflects failures and potential hazards of equipment, so PD detection is important to protect the power system. The most reliable method now is the pulse current method (PCM), but the device of PCM is large and hard to carry. Ultraviolet (UV) pulse detection is another method to detect PD, which has a high precision, strong anti-interference ability, and a long effective distance. However, the existing detection system does not work well when the PD is weak and can hardly reflect the hidden trouble of equipment. This paper introduces an improved PD detection system, based on the UV Pulse Method, which is of high precision and can reflect early discharge. In this study, a corresponding detection device was also built. This device is handheld, non-contact, easy to use, and of high precision.

High precision multi-pulse laser ranging echo detection technology

2018 ◽  
Vol 39 (1) ◽  
pp. 130-133
Author(s):  
Gao Wei ◽  
Ma Shiwei ◽  
Duan Yuanyuan
Keyword(s):  
Pulse Laser ◽  
High Precision ◽  
Laser Ranging ◽  
Detection Technology ◽  
Echo Detection

kHz repetition Satellite Laser Ranging system with high precision and measuring results

2011 ◽  
Vol 56 (15) ◽  
pp. 1177-1183 ◽  
Author(s):  
ZhiBo WU ◽  
HaiFeng ZHANG ◽  
ZhongPing ZHANG ◽  
FuMin YANG ◽  
JuPing CHEN ◽  
...  
Keyword(s):  
High Precision ◽  
Satellite Laser Ranging ◽  
Laser Ranging

A High-Precision Pulsed Laser Ranging Time Interval Measurement Technology Based on Sine Curves Method

2014 ◽  
Vol 41 (8) ◽  
pp. 0808002
Author(s):  
黄民双 Huang Minshuang ◽  
龙腾宇 Long Tengyu ◽  
刘慧慧 Liu Huihui ◽  
张泽 Zhang Ze
Keyword(s):  
High Precision ◽  
Pulsed Laser ◽  
Laser Ranging ◽  
Measurement Technology ◽  
Time Interval ◽  
Interval Measurement ◽  
Time Interval Measurement

High speed and high precision time-interval measurement system in pulsed laser ranging

2015 ◽  
Vol 30 (1) ◽  
pp. 83-88 ◽  
Author(s):  
岱钦 DAI Qin ◽  
毛有明 MAO You-ming ◽  
吴凯旋 WU Kai-xuan ◽  
吴杰 WU Jie ◽  
李业秋 LI Ye-qiu
Keyword(s):  
High Precision ◽  
Measurement System ◽  
High Speed ◽  
Pulsed Laser ◽  
Laser Ranging ◽  
Time Interval ◽  
Interval Measurement ◽  
Precision Time ◽  
Time Interval Measurement

High precision linear frequency modulation ranging system based on semiconductor laser

2018 ◽  
Vol 32 (11) ◽  
pp. 1850136 ◽  
Author(s):  
Mingyuan Xue ◽  
Cunxiao Gao ◽  
Linquan Niu ◽  
Shaolan Zhu ◽  
Na Guo ◽  
...  
Keyword(s):  
Semiconductor Laser ◽  
High Precision ◽  
Frequency Modulation ◽  
Signal To Noise Ratio ◽  
Linear Frequency Modulation ◽  
Repetition Frequency ◽  
Laser Ranging ◽  
Signal To Noise ◽  
Linear Frequency ◽  
Noise Ratio

Based on the linear frequency modulation (LFM) of semiconductor laser, a laser ranging system is built. The ranging precision of the system is about micron dimension with the repetition frequency of 100 kHz and a distance of 1–10 m. We analyzed the ranging precision experimentally. As the bandwidth increases, the ranging precision becomes higher and higher. When the bandwidth is fixed, as the distance increases, the signal-to-noise ratio (SNR) will decrease, which reduces the precision.

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