An external geometric parameter measuring system is designed using the GPS positioning technology. The traditional track inspection technology and GPS positioning technology are combined into the system. The system is composed of a four-componentsatellite system, track inspection apparatus carrying a receiver, control network and GPRS station. The track observation network is built at first while GPS base stations are already set up. At the same time, the GPS receiver is loaded on the existing track inspection instrument as a moving station. The data acquisition module of the measurement system consists of GPS base stations and a moving station. Then, real-time location information is collected by the GPS stations while the track inspection instrument walks along the track. The positioning data are processed by the double differencing carrier phase algorithm. The integer ambiguity resolution based on LAMBDA ( the least-squares ambiguity decorrelation adjust method) is the key problem of the GPS positioning. Next, the position of the antenna center is calculated. Finally, using internal geometric parameters and antenna center positioning data, the external railway geometric parameters are calculated. The results of the static experiment and field test confirm the validity of the measurement system. On the one hand, the static observation error is within 0.5 mm while the dynamic measurement error is less than 15 mm, on the other hand the labor cost of the system is low due to high automation.
FU Qinyi
,
LIU Zhiping
,
LI Kunwu
. An External Railway Geometric Parameter Measurement System Based on GPS[J]. Science & Technology Review, 2014
, 32(31)
: 41
-45
.
DOI: 10.3981/j.issn.1000-7857.2014.31.004
[1] 陈强, 刘丽瑶, 杨莹辉, 等. 高速铁路轨道几何状态的车载摄影快速检 测方法与试验[J]. 铁道学报, 2014, 36(3): 80-86. Chen Qiang, Liu Liyao, Yang Yinghui, et al. Static geometry measurement of high- speed railway tracks by vehicle- borne photogrammetry[J]. Journal of the China Railway Society, 2014, 36(3): 80-86
[2] 罗林. 高速铁路轨道必须具有高平顺性[J]. 中国铁路, 2000, 10(9): 8- 11. Luo Lin. High smoothness, a must for the high-speed railway tracks[J]. Chinese Railways, 2000, 10(9): 8-11.
[3] 伏思华, 于起峰, 王明志, 等. 基于摄像测量原理的轨道几何参数测量 系统[J]. 光学学报, 2010, 30(11): 3203-3208. Fu Sihua, Yu Qifeng, Wang Mingzhi, et al. Railway geometric parameters measurement system based on video metrics[J]. Acta Optica Sinica, 2010, 30(11): 3203-3208.
[4] Alippi C, Casagrande E, Scotti F, et al. Composite real- time image processing for railways track profile measurement[J]. IEEE Transactions on Instrumentation and Measurement, 2000, 49(3): 559-564.
[5] 高春雷, 王发灯. 利用激光准直技术检测线路的长波不平顺[J]. 铁道 建筑, 2009, 15(1): 81-85. Gao Chunlei, Wang Fadeng. Inspection of long-wave none-smoothness for the railway track using the laser alignment technology[J]. Railway Engineering, 2009, 15(1): 81-85.
[6] Iyengar R N, Jaisal O R. Random field modeling of railway track irregularities[J]. Journal of Transportation Engineering, 1995, 121(4): 303-308.
[7] 胡庆丰, 安博格. GRP1000轨检小车进行无砟轨道检测的作业方法[J]. 铁道勘察, 2008(3): 17-20. Hu Qingfeng, An Boge Operational method for checking ballastlesstrsck with GRP1000 track checking car made by amberg technology AG[J]. Railway Investigation and Surveying, 2008(3): 17-20.
[8] 夏敬潮, 叶世榕, 刘炎炎, 等. Wi-Fi辅助下附有高程信息的GPS定位[J]. 武汉大学学报: 信息科学版, 2014, 39(1): 52-55. Xia Jingchao, Ye Shirong, Liu Yanyan, et al. Wi- Fi assisted GPS positioning with fixed geodetic height[J]. Geomatics and Information Science of Wuhan University, 2014, 39(1): 52-55.
[9] 刘沛, 王剑. 带状GPS控制网的方案探讨及实例分析[J]. 工程勘察, 2009(2): 435-439. Liu Pei, Wang Jian. Optimization layout and implementation survey of ribbon GPS control network[J]. Geotechnical Investigation & Surveying, 2009(2): 435-439.
[10] Yoon S, Lundberg J B. An integer ambiguity resolution algorithm for real- time GPS attitude determination[J]. Applied Mathematics and Computation, 2002, 129(1): 21-41.
[11] 宋高顺, 王昌明, 何云峰, 等. 模糊度函数法中适应度函数的自适应 设计[J]. 南京理工大学学报: 自然科学版, 2012, 36(5): 840-845. Song Gaoshun, Wang Changming, He Yunfeng, et al. Self- adaptive design of fitness function in ambiguity function method[J]. Journal of Nanjing University of Science and Technology: Natural Science Edition, 2012, 36(5): 840-845.
