Fault Diagnosis and Separation for a Distributed Rotary-laser Scanning System

doi:10.11947/j.JGGS.2023.0406

Journal of Geodesy and Geoinformation Science ›› 2023, Vol. 6 ›› Issue (4): 70-78.doi: 10.11947/j.JGGS.2023.0406

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Fault Diagnosis and Separation for a Distributed Rotary-laser Scanning System

Siyang GUO¹^,²(), Yin GUO¹(), Shibin YIN¹, Hongbo XIE², Jigui ZHU²

1. Isvision (Hangzhou) Technology Company Limited, Hangzhou 310000, China
2. School of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China

Received:2023-09-07 Accepted:2023-11-22 Online:2023-12-20 Published:2024-02-06
Contact: Yin GUO E-mail:guosiyang@isv-tech.com;guoyin@isv-tech.com
About author:Siyang GUO E-mail: guosiyang@isv-tech.com

Abstract

Abstract:

The wMPS is a laser-based measurement system used for large scale metrology. However, it is susceptible to external factors such as vibrations, which can lead to unreliable measurements. This paper presents a fault diagnosis and separation method which can counter this problem. To begin with, the paper uses simple models to explain the fault diagnosis and separation methods. These methods are then mathematically derived using statistical analysis and the principles of the wMPS. A comprehensive solution for fault diagnosis and separation is proposed, considering the characteristics of the wMPS. The effectiveness of this solution is verified through experimental observations. It can be concluded that this approach can detect and separate false observations, thereby enhancing the reliability of the wMPS.

Key words: rotary-laser scanning measurement system; least square method; fault diagnosis; fault separation

Siyang GUO, Yin GUO, Shibin YIN, Hongbo XIE, Jigui ZHU. Fault Diagnosis and Separation for a Distributed Rotary-laser Scanning System[J]. Journal of Geodesy and Geoinformation Science, 2023, 6(4): 70-78.

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Two kinds of errors in hypothesis testing
Hypothesis	Decisions
Hypothesis	Accept H₀	Reject H₀
H₀ is true	Correct decision	Type I error
H₀ is false	Type II error	Correct decision

Station number	Before adjustment		After adjustment
Station number	θ₁	θ₂		θ₁	θ₂
No.1	212.7621	298.8698	266.2134		298.8694
No.2	53.6115	140.5296	49.2134		135.2873
No.3	105.7377	189.2329	105.7369		189.2325
No.4	229.0982	317.5178	229.0986		317.5170

Station number	Standardized residuals before adjustment/mm		Standardized residuals after adjustment /mm
Station number	Surface 1	Surface 2		Surface 1	Surface 2
1	-0.12	0.23	-821.3		321.3
2	0.13	-0.16	437.9		800.1
3	-0.08	-0.11	32.3		105.6
4	-0.19	0.1	682.7		138.2

Fault Diagnosis and Separation for a Distributed Rotary-laser Scanning System

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