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	1. A method of quantitative analysis based on deviation coefficient and sliding time window
	ZHANG Zhanyang,YANG Guohua,SUN Qikai,ZHANG Junqing,HE Yadong
	Surveying and Mapping Technology 27 December 2019
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	Abstract:In order to scientifically and accurately describing the shape of deviation distribution curve of the short-level segment data of seismostation, this paper used deviation coefficient and sliding time window to analyze and summarize trends of deviation distribution curves of 2-3(k) segment of Chaoyang seismostation quantitatively before and after Chaoyang M4.6 and M4.3 earthquakes on May 22, 2016: general data anomalies caused by crustal deformation reveal the deviation coefficients get larger and the shapes of deviation distribution curves of the segment deviate from normal distribution before the earthquake, and the deviation coefficients get smaller and the shapes of deviation distribution curves of the segment restore to normal distribution after the earthquake. Then preliminary analysis of earthquake risk near the seismostation was made based on recent data. As a result, the figures prove that this quantitative analysis method has reference valuable for data anomalies recognition before earthquake to a certain extent, which also provides a new way of research for earthquake monitoring and prediction analyzing.
	TO cite this article:ZHANG Zhanyang,YANG Guohua,SUN Qikai, et al. A method of quantitative analysis based on deviation coefficient and sliding time window[J].


	2. Noise Analysis of GPS Coordiante Time Series
	LI Lihua
	Surveying and Mapping Technology 10 November 2015
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	Abstract:The noise property not only affects the accuracy of the parameter estimation, but also reflects the various driving factors of the environment. Therefore, the noise model is the basis of designing the optimal parameter estimation, and it is also the premise of various geometric, physical, and other parameters based on the observation data. Noise analysis is very important in the data processing. The noise property of the GPS coordinate time series has been explored in detail in this paper. Because of the electronic GPS receiver collecting data with high sampling rate, colored noise arise in the GPS coordinate time series. The methods of determining the stochastic model of GPS coordinate noise are discussed in detail. The results show that the GPS real-time measurement deviations have a high autocorrelation, which should be considered in the GPS high-precision positioning.
	TO cite this article:LI Lihua. Noise Analysis of GPS Coordiante Time Series[OL].[10 November 2015] http://en.paper.edu.cn/en_releasepaper/content/4661034


	3. The application of robust estimation in coordinate transformation
	ZHANG Heming,WANG Zhongyuan
	Surveying and Mapping Technology 25 August 2011
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	Abstract:Gross errors in data processing will have great impact, providing a robust estimation to eliminate and reduce measurement errors in the estimation of gross errors on the interference and influence, solving the best valuation method. In this paper, a modern adjustment theory discussed robust estimation theory, the coordinate precision is low in the public or the case of error is too large to obtain high-precision coordinate transformation method. Were using a different anti-difference weighting function for data inspection, data obtained through comparisons of the methods for obtaining high-precision coordinates.
	TO cite this article:ZHANG Heming,WANG Zhongyuan. The application of robust estimation in coordinate transformation[OL].[25 August 2011] http://en.paper.edu.cn/en_releasepaper/content/4440684


	4. Assessment of phase unwrapping approaches
	Fu Tuo,Zhangshubi
	Surveying and Mapping Technology 25 April 2011
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	Abstract:With GAMMA software, VC++ and MATLAB coding implementing six kinds of phase unwrapping approaches ,this paper presents the best method for different situations through two sets of experimental results used for analysing and comparing run time and precision. In the plain and alpine area, the best phase unwrapping methods are separately Goldstein branch-cut method and Minimum Cost Network Flow method.
	TO cite this article:Fu Tuo,Zhangshubi. Assessment of phase unwrapping approaches[OL].[25 April 2011] http://en.paper.edu.cn/en_releasepaper/content/4423962


	5. The stability estimation of irregular coal pillars
	cui ximin,Peng Xiaozhan,Yuan Debao,Zhao Rui,Zhang Bing,Ma Deming
	Surveying and Mapping Technology 12 March 2007
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	Abstract:The pillar stability is very important for the safety mining and the irregular pillar stability estimation is complicated than the regular pillar. Generally, the stability of irregular coal pillars is controlled by the width / height ratio, mining depth, tributary area and related to its spatial distribution. Based on the study of regular pillar stability estimation, the concept of efficient width is proposed and the Voronoi Diagram is introduced to determine the tributary area. The calculated results demonstrate that there are 72 failed pillars, 14 unstable pillars and 52 stable pillars in panel 404. A single pillar inadvertently fail the load could be transferred to adjacent pillars causing those to be overload. This successive overloading process leads to an unstable progressive “domino” effect whereby large areas of the mine occur.
	TO cite this article:cui ximin,Peng Xiaozhan,Yuan Debao, et al. The stability estimation of irregular coal pillars[OL].[12 March 2007] http://en.paper.edu.cn/en_releasepaper/content/11384

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