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	Accuracy analysis and real-time inversion and imaging logging while drilling azimuth electromagnetic wave resistivity measurements 期刊论文 OAI收割 CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION, 2023, 卷号: 66, 期号: 9, 页码: 3990-3998 作者: Li XingHan; Zhang WenXiu; Chen Peng; Chen WenXuan; Wang Jun \| 收藏 \| 浏览/下载：20/0 \| 提交时间：2023/12/28 Azimuth electromagnetic wave resistivity measurement logging while drilling 1D inversion and imaging Logging while drilling Accuracy analysis
	High precision magnetic azimuth correction of horizontal well by multi-station analysis 期刊论文 OAI收割 CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION, 2019, 卷号: 62, 期号: 7, 页码: 2759-2766 作者: Liu JianGuang; Di QingYun; Zhang WenXiu \| 收藏 \| 浏览/下载：42/0 \| 提交时间：2019/08/22 MWD (Measurement While Drilling) technology Magnetic azimuth correction Multi-station analysis High precision
	Analysis and research of polarization aberration in rapid space angle measuring system 期刊论文 OAI收割 ACTA PHYSICA SINICA, 2018, 卷号: 67, 期号: 3 作者: Li Chun-Yan; Lu Wei-Guo \| 收藏 \| 浏览/下载：31/0 \| 提交时间：2018/12/11 Polarized Light Azimuth Measurement Polarization Aberration Glan-taylor Prism
	The method of the system error modification of photoelectric theodolite of T type (EI CONFERENCE) 会议论文 OAI收割 2012 International Conference on Optoelectronics and Microelectronics, ICOM 2012, August 23, 2012 - August 25, 2012, Changchun, China 作者: Zhao L.; Zhang Y. 收藏 \| 浏览/下载：19/0 \| 提交时间：2013/03/25 The system error of photoelectric theodolite includes Visual axis error This paper ratiocinates the formula of Azimuth orientation error horizontal axis error elevation zero error and Visual axis error of Photoelectric theodolite of T type by triangle relation in space. Photoelectric theodolite of U type with main visual axis and auxiliary visual axis shoots images and inverse images of marks to obtain system error data. Error is less than 0.4 second by comparing error data of auxiliary visual axis with error data of main visual axis and the precision of two methods is identical. It has been validated that the method of error measurement of photoelectric theodolite of T type is right. 2012 IEEE. vertical axis error Azimuth orientation error elevation zero error
	Optimum design of laser encoding and decoding on laser beam-riding guidance (EI CONFERENCE) 会议论文 OAI收割 2nd International Conference on Frontiers of Manufacturing and Design Science, ICFMD 2011, December 11, 2011 - December 13, 2011, Taichung, Taiwan 作者: Yang L.; Yang L. 收藏 \| 浏览/下载：33/0 \| 提交时间：2013/03/25 Operating principle of laser beam-riding guidance was set forth. Based on the principle of spatial frequency-encoding experimental results demonstrated that the receiver can receive correctly the encoded signal and can decode the signal an optimum laser encoding mode was designed measurement for the missdistance is feasible and all the performance parameters satisfy the demand. (2012) Trans Tech Publications which can transfer continuous laser into pulse laser that represents different position information. Then the mathematic model of deviation from target is built Switzerland. a modified encoding pattern was presented which is composed of two light paths crossed 90. Azimuth information of target is given in orthogonal coordinate system and deviation from target is linearity. As well as characteristic distribution of spatial laser field is analyzed. Corresponding decoding mode was presented by testing in 2 kilometers outdoor
	Experimental analysis of accelerometer installation error (EI CONFERENCE) 会议论文 OAI收割 2010 International Conference on Computer, Mechatronics, Control and Electronic Engineering, CMCE 2010, August 24, 2010 - August 26, 2010, Changchun, China Yanqiu H.; Juan C.; Peng Y. L. 收藏 \| 浏览/下载：18/0 \| 提交时间：2013/03/25 When accelerometer is installed errors would be produced which will greatly degrade the measurement accuracy so to the tracking precision while being applied in the compound control. We make the experimental analysis for the accelerometer installation in which the accelerometer is installed parallel to the azimuth and 30 degree away the azimuth. The data are dealt with and compared with the theoretical results. Out work can offer useful information for the calibration of accelerometer in the optoelectronic tracking system. 2010 IEEE.
	Study on the Driving Scheme of a 4-m Alt-azimuth Telescope (EI CONFERENCE) 会议论文 OAI收割 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies, AOMATT 2007: Large Mirrors and Telescopes, July 8, 2007 - July 12, 2007, Chengdu, China 作者: Zhang J.; Dai S.; Zhao Y.; Zhao Y.; Zhao Y. 收藏 \| 浏览/下载：23/0 \| 提交时间：2013/03/25 By summarizing the corresponding parameters Of the driving system of a 4-m Alt-azimuth telescope some unit techniques like the driving modes and structure angular position measurement methods in detail have been analyzed in the paper. A set of primary schemes for astronomical applications including the altitude axes being driven by 2 DC torque motors the azimuth by 4 DC torque motors using helical gears and two pieces of the 27-bit segment tape encoders for each set of axes is proposed. To meet practical engineering needs the shafting motion parameters are designed and motor elementary parameters are primarily calculated to offer the important references for further study on system driving model and prototype development.
	Error analysis and test study of fiber optic gyroscope north-finder (EI CONFERENCE) 会议论文 OAI收割 Advanced Sensor Systems and Applications II, November 8, 2004 - November 12, 2004, Beijing, China Zhang Z.; Sun J.; Wu K. 收藏 \| 浏览/下载：22/0 \| 提交时间：2013/03/25 North-finder system is an important application of the inertial technology. It provides true north azimuth information to f all kinds of ground-based equipment. This paper designed a dynamic automatic north-finder based on the modulation output of fiber optic gyroscope (FOG). In this scheme the sine output signal of the FOG was sampled and disposed and then the real north of surveyed point on the surface of earth was calculated. The deviation caused by the base tilt was compensated by an accelerator. The output signals of FOG and accelerator were computed combined with the position sampled from increasing encoder by digital signal processor. Successive rotating technique was adopted to modulate the FOG signal periodically. Most of the low frequency part of random gyro drift errors was compensated. The north-finder accuracy was improved compared with the traditional static measuring method. The test result shows the FOG automatic north-finder obtains 2' true north angle accuracies within not more than three minutes can meet the orientation need of artillery terrain measurement vehicle armored car unmanned drive vehicle geodetic survey and tunnel exploration.