共查询到19条相似文献,搜索用时 78 毫秒
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本文提出了一种适用于精密脉冲测距系统测定时间间隔的不完全同步计数测时法。初步试验表明,该方法能在简单的软硬件环境中提高测距分辨率数百倍,仪器测距精度可望达到若干厘米。文章还就系统软硬件设计的要点作了简要说明,并指出这种测时法也可用于重复周期不由系统本身决定的外部方波序列脉宽的相对测定。 相似文献
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A combined single range and single image device for low-cost measurement of building façade features
Celestino Ordóñez Pedro Arias José Herráez Jaime Rodríguez María T. Martín 《The Photogrammetric Record》2008,23(122):228-240
The dimensions of building façades and window apertures are usually determined by making direct measurements using tapes and plummets. This approach, however, has a number of drawbacks including the physical risk to which the persons making the measurements are exposed. This paper proposes an indirect approach based on close range photogrammetry that is inexpensive, simple, fast and safe, and which does not require specialist staff or direct ground control measurements. The method is based on taking a picture using a digital camera and measuring the distance to the object using a handheld laser distance meter. Both items of equipment are mounted on a specially designed support that allows the laser distance meter to move independently of the camera. 相似文献
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康宏伟 《测绘与空间地理信息》2011,34(4):174-176
结合轧机基础施工和设备安装实例,总结了设备基础施工放样和安装测量中具有普遍性的技术工作,针对特殊预埋件的放样定位采用独立建网一次固定的方法,设备安装采用专用控制网,通过角度严密归方、精密校正距离的方法,用高精度测量仪器直接控制安装施工,保证了基础预埋件位置的准确和设备各机组之间严密的位置关系。 相似文献
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介绍了GPS激光主动式定位系统的硬件组成及功能,分析了该方法定位的基本原理,并对试验结果进行了分析,验证该方法的可行性及定位精度。利用系统在不同的流动站对目标利用系统同轴望远镜进行照准,发射激光获取不同流动站的距离,利用数字罗盘获取激光仪的姿态,GPS_OEM获得流动站点的GPS坐标。利用空间距离交会原理解算目标的3维坐标,为不易到达的测区提供技术方法。 相似文献
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基于89C55WD单片机的32位高精度计时器 总被引:1,自引:0,他引:1
针对实际测试工作的需要,为了精确测量连续脉冲信号的间隔时间,提出了一种利用两个32位计时器进行连续脉冲间隔时间的测量方法.这两个32位计时器是由89C55WD单片机内部的两个16位定时器/计数器扩展而成的.首先,将输入的信号经过高速光耦合器和采样电路处理;然后,89C55WD在中断方式下利用两个32位计时器交替对连续脉冲信号的间隔时间进行测量.通过合理分配中断资源,保证了装置工作的可靠性.该装置结构简单,频率范围广,并且达到了较高的精度,经过实际测量完全可以满足要求. 相似文献
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Rudi Schüler 《Journal of Geodesy》1981,55(3):196-202
An interferometer using modern interferometric techniques has been developed at ZIPE, which allows the measurement of distances
of more than 1 km. The interferometric equipment was designed for comparing distances of different lengths and directions
and is appropriate for testing horizontal earth crustal movements.
The new interferometer is based on Michelson’s interferometer using collimated light. The interference fringes are received
by means of photoelectric detectors and can be observed visually by an oscilloscope. The duration of an interference signal
need be only 1 ms and the corresponding path difference is registered by printing. In order to get such interferograms, the
path difference of the two beams is periodically changed within an effective range of 8 mm, whilst the total difference between
the beams can reach an amount of 1 m. The interferometer has been tested on the Potsdam International Standard Base Line up
to a distance of 2.7 km. 相似文献
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本文面向建筑物变形监测,设计并开发了一整套可对远距离、室外成像的标志中心进行精确定位的新技术,其重点在于整像素边缘定位和数据质量控制。提出了最大梯度投影概念,以最大梯度投影替代传统梯度算子计算标志的整像素边缘,并在此基础上提出改进的边缘细化算法,同时引入曲率筛选方法,形成一整套整像素边缘定位新技术,规避室外成像环境的不确定干扰,以获取完整、准确的整像素细化边缘。在亚像素中心定位后,以统计理论为框架设计了一套数据质量控制机制,筛选并保留满足统计限值的定位结果参与最终的定位计算,有效控制了相机拍照时轻微晃动给中心定位引入的误差。在不同的自然环境、背景及摄程下进行实测,结果表明,该图像定位方法具有定位性能稳定、定位精度高、处理速度快、对成像设备要求低、对室外环境适应性强等优势。使用标配镜头的主流单反相机,200 m摄程内的标志中心定位精度在3.5 mm内,可应用于建筑物变形监测。 相似文献