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全站仪小角法基坑水平位移监测的误差分析与精度控制
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作者 牟建华 《城市勘测》 2019年第6期141-144,共4页
采用视准线小角法监测基坑水平位移,监测点相对于基准线的偏差中误差应满足1 mm^3 mm的精度要求,对观测要求很高。通过分析小角法测量原理和误差来源,讨论了照准误差、测站对中误差和测角误差的影响。在不同偏差中误差控制值和选用不同... 采用视准线小角法监测基坑水平位移,监测点相对于基准线的偏差中误差应满足1 mm^3 mm的精度要求,对观测要求很高。通过分析小角法测量原理和误差来源,讨论了照准误差、测站对中误差和测角误差的影响。在不同偏差中误差控制值和选用不同标称精度全站仪的情况下,应进行理论精度估算并合理确定小角值的测回数。为提高观测精度,提出了工作基点至监测点的距离、小角值测回数和全站仪选型等限制措施,有利于达到预警监控的目标要求。 展开更多
关键词 全站仪小角法 基坑工程 偏差中误差 测回 标称精度
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星源通掌上森林调查仪面积测量精度研究 被引量:4
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作者 李崇贵 陈华安 李春干 《林业科学》 EI CAS CSCD 北大核心 2005年第3期174-178,共5页
Xingyuangtong handhold forest inventory instrument is a microcomputer_based Hi_tech product integrating remote sensing、mobile GIS and GPS, which is developed by 3S research center of Shenzhen Polytechnic. It can be u... Xingyuangtong handhold forest inventory instrument is a microcomputer_based Hi_tech product integrating remote sensing、mobile GIS and GPS, which is developed by 3S research center of Shenzhen Polytechnic. It can be used in forest resource inventory, area calculation on map, area survey on the spot, compartment and sub_compartment mapping and editing based on remote sensing images or scanned relief maps, interactive query and amendment between graphics and its attributes, etc. On the basis of theory analysis of area survey principle, the practical area survey precision of nine different_sized plots in different period of time and under different interfered conditions is analyzed in order to study the possible precision of area survey on the spot by using this product. It is demonstrated that Xinyuantong handhold forest resource inventory instrument can meet the precision needs of returning the grain plots to forestry, acceptance check of forestation land, area survey of compartment and sub_compartment, etc. This product can be widely used in forest resource inventory. 展开更多
关键词 GPS单点定位 面积测量 面积偏差中误差
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手持型GPS接收机面积测量精度研究 被引量:1
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作者 陈华安 李崇贵 《林业调查规划》 2010年第5期1-6,共6页
在理论分析手持型GPS接收机面积测量原理的基础上,对9个不同大小地块在不同时段、不同干扰条件下实际面积测量的精度进行分析,详细论证了手持型GPS接收机完全能够满足退耕还林、造林地验收、小班面积测量等精度的需要,可广泛应用于森林... 在理论分析手持型GPS接收机面积测量原理的基础上,对9个不同大小地块在不同时段、不同干扰条件下实际面积测量的精度进行分析,详细论证了手持型GPS接收机完全能够满足退耕还林、造林地验收、小班面积测量等精度的需要,可广泛应用于森林资源调查. 展开更多
关键词 手持型GPS接收机 GPS单点定位 面积测量 精度 面积偏差中误差
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Moderate deviations and hypothesis testing for signal detection problem 被引量:4
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作者 GAO FuQing ZHAO ShouJiang 《Science China Mathematics》 SCIE 2012年第11期2273-2284,共12页
Abstract We use moderate deviations to study the signal detection problem for a diffusion model. We establish a moderate deviation principle for the log-likelihood function of the diffusion model. Then applying the mo... Abstract We use moderate deviations to study the signal detection problem for a diffusion model. We establish a moderate deviation principle for the log-likelihood function of the diffusion model. Then applying the moderate deviation estimates to hypothesis testing for signal detection problem we give a decision region such that its error probability of the second kind tends to zero with faster speed than the error probability of the first kind when the error probability of the first kind is approximated by e-ατ(T), where α〉 0, τ(T) = o(T) and τ(T)→∞ as the observation time T goes to infinity. 展开更多
关键词 large deviations moderate deviations signal detection hypothesis testing
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