研究目的:CP III轨道控制网相邻区段之间能否实现合理平顺搭接已成为影响控制网能否达到高精度的重要因素之一，进而影响轨道的平顺性。本文针对现行规范中直接坐标严密平差搭接方法在可操作性上存在的问题，结合工程实际对CP III网相邻区段搭接方法进行对比研究，意在发展一种既能满足工程实际需要又能有效提高CP III网相邻区段之间搭接精度的新方法。
研究结论:(1)余弦函数平滑搭接法在CP III平面网相邻区段搭接中应用是可行的，其搭接处理后的长波平顺性和相对精度均高于直接坐标严密平差搭接法;(2)提出的“基于余弦函数平滑坐标的严密平差搭接法” 更加有利于提高搭接区段轨道的短波平顺性和整体线路的长波平顺性;(3)本文研究成果满足工程测量实际需要，可应用于无碎轨道铺设阶段和运营维护阶段CP III平面网相邻区段平顺搭接处理，对相关测量规范的完善有一定参考价值。
Research purposes: Whether the lapping effects between adjacent sections are reasonable as well as smooth or not have been a predominant influence in achieving high-precision for CP III control network, and will affect the track regularity further. In current code there are problems over practical maneuverability use while using constrained adjustment technique for overlapping points. Therefore a comparative research on lapping methods is conducted combining with engineering practice so as to develop a new lapping method between adjacent sections for CPI(I track control network.
Research conclusions: (1)It is feasible to use cosine function smoothing method for CP III lapping between adjacent sections，and the performances of cosine function smoothing method are superior to constrained adjustment method in terms of long waves of the track regularity and relative accuracy.(2)The proposed method，which is designed to perform constrained adjustment on the basis of cosine function smoothing for the lapping points，would help to improve the performances of the track regularity of the short waves as well as the railway line regularity of the overall long waves. (3)It is validated that the research results can meet the practical requirements of engineering surveying and can be applied to CP III lapping between adjacent sections over the ballast less track construction stage as well as operating and maintenance stage. The research also provides a reference for the perfection of the specifications for CP III lapping between adjacent sections and related measurement.
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