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谢文军 《测绘与空间地理信息》2013,36(6):191-193
在水准测量工作中,水准记簿是一项非常繁琐的工作,记录员作业过程中高度紧张,稍有差错就可能导致全测段返工。根据有关技术依据及规范,采用PDA掌上电脑作为硬件平台,在windows XP软件支持下,利用Microsoft Visual Studio编程环境,完成基于PDA的四等水准电子手簿系统的程序设计,完全代替手工水准记簿。 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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GNSS软件无线电接收机及典型案例 总被引:1,自引:0,他引:1
介绍了GNSS软件无线电接收机和它与传统接收机相比的优缺点,并引述了典型的GNSS软件接收机及其应用。 相似文献
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