排序方式: 共有115条查询结果,搜索用时 15 毫秒
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针对Sprinter数字水准仪数据记录中存在的不足之处,采用PDA编制电子记簿的方法加以解决. 相似文献
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基于PDA地下管线探测数据采集系统 总被引:1,自引:0,他引:1
为改变传统的管线外业调查流程,将探查和测量合为一步,实现数据采集的数字化,降低地下管线外业调查的复杂度,提出将PDA用于地下管线外业记录的研究思路。首先根据系统需求分析,设计系统逻辑结构图和地下管网数据结构表,然后在功能设计的基础上使用EPSCE软件的二次开发工具开发了系统功能,最后进行验证,取得较好的运行效果。为地下管线外业调查工作进行有益的探索。 相似文献
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介绍了一种基于PDA和蓝牙的无缆钻孔测斜仪。该仪器采用三轴磁阻传感器和两轴加速度计传感器作为测量元件,适用于无磁干扰的钻孔测斜;采用自动存储方式进行数据采集,取消了测井电缆的配置;以PDA为核心,开发了基于Windows Mobile 6.0平台的测斜软件;以蓝牙代替数据线实现测斜仪和PDA的无线通讯传输。该仪器具有精度高、可靠性好、质量轻、配套设备少和操作简便等优点,极大的减轻了野外作业强度,提高了效率,同时也大幅度降低了使用单位配置成本。 相似文献
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Dyadic wavelet analysis of PDA signals 总被引:3,自引:0,他引:3
The dyadic wavelet transform is used to analyze PDA measured signals in order to identify the CASE-damping factor, which may be directly calculated from the dyadic wavelet analysis, not from the correlation study; accordingly, the pile capacity may be more exactly estimated by the CASE method. The dyadic wavelet transform can decompose a PDA measured signal into an incident impact wave and a reflected impulse wave at the certain scale that are clearly shown on the wavelet transform graph. The relation between the incidence and the reflection has been established by a transfer function based on the dyadic wavelet transform and the one-dimensional wave equation, whose phase is the time delay between the incident and the reflected and whose magnitude is a function of the CASE-damping factor. An autocorrelation function analysis method is proposed to determine the time delay and to estimate the magnitude of the transfer function that is determined by the ratio of the maximum of the autocorrelation function to the second peak value represented the reflected wave on the autocorrelation function graph. Thus, the damping factor is finally determined. An analog signal, a PIT signal and five PDA signals demonstrate the proposed methods, by which the time delay, the CASE-damping factor, and pile capacity are determined. The damping factors and pile capacity are good agreement with those by CAPWAP. 相似文献
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