高铁北斗基准控制网构建及优化方法

Construction and Optimization Method of High Speed Railway Beidou Datum Control Network

目前高铁工程测量控制网采用传统测量方式进行建设和维护时,存在投入成本高、测量周期长的问题,提出基于北斗连续运行基准站构建高铁北斗基准控制网的方案。针对铁路控制网条带状分布特征,提出综合利用外部基准站点进行融合构网,并通过站点筛选、基线长度控制以及局部网型调整等流程对融合后的站网进行优化。以京沪高铁徐州—南京区段为例,以网型系数以及提供的差分数据服务质量为评价指标,验证了优化方法的效果。优化后的网型剔除了结构异常的三角网,将网型系数最小值由0.04提高到0.32,差分数据服务的固定率由83.6%提高到92.2%,内符合精度也由3.6cm提高到2.3cm,同时减少约31%的外部站点接入,有效降低了接入成本。

Aiming at the problems of high investment cost and long survey period when the high speed railway engineering survey control network is constructed and maintained by traditional survey methods,this paper proposes a scheme for constructing high speed railway Beidou datum control network based on Beidou continuous operation reference station.According to the strip distribution characteristics of railway control network,this paper proposes to comprehensively utilize external reference stations for network integration and construction,and optimize the integrated station network through the processes of station screening,baseline length control and local network type adjustment.Taking Xuzhou-Nanjing Section of Beijing-Shanghai HSR as an example,the network type coefficient is used as the evaluation index to verify the effect of the optimization method.The optimized network type eliminates the triangular network with abnormal structure,increases the minimum network type coefficient from 0.04 to 0.32,and reduces about 31%of external site access,effectively reducing the access cost.