北斗导航卫星系统在铁路控制测量中的应用研究

为探讨北斗导航卫星系统静态测量模式在铁路控制测量中的适用性,利用基线重复性指标以及最小二乘法拟合得到固定误差和比例误差指标,基于连盐铁路控制网24 h连续观测数据,研究分析了基线向量实测精度。结果表明,单独使用北斗导航卫星系统进行静态测量,可以满足铁路五等测量精度要求;若结合GPS观测数据,能够有效提高静态测量精度和可靠性;增加观测时段长度,可以降低固定误差,但对比例误差的影响不明显。建议使用商用软件基于北斗导航卫星系统观测数据进行铁路控制测量时,将基线长度控制在15 km以内。

Application of Beidou Navigation Satellite System in Railway Control Survey

In order to investigate the practicability of the static positioning of BeiDou Navigation Satellite System(BDS) in railway control survey,three parameters were used to evaluate the precision of baselines.They were baseline vector repeatability index,constant error and proportional error which were derived from the least squares fitting method.Based on the 24-hour continuous observation of the Lianyan railway control network,the accuracy of the baseline vectors was analyzed.The results show that the static positioning using the BDS alone can meet the requirements of the fifth-class network accuracy.If combined with the GPS observation data,the positioning accuracy and reliability can be effectively improved.Increasing the length of the observation session can reduce the constant error,but the influence of the proportional error is not obvious.The baseline length is recommended to be within 15 km when the commercial software is used for railway control survey based on the BDS observation data.