原建网和扩建网布网方案的非线性多目标同步设计

The Layout of a Network Combing Orginal and Expanded Nets and its Nonlinear and Multi-target Synchronous Desigh

工程控制网建成后 ,随着工程发展或城市的扩大 ,总存在网的扩建 ,增测新点、增测新的观测元素、变更观测量的精度 ,或原网建成后按逐级控制原则 ,低等级点的加密布网。这都是两级网或多级网、两期网或多期网的布设问题。这要处理好两阶段布网中点位的选择、观测计划和观测精度变化及二者的相互影响。鉴于两阶段布网方案设计的依赖性 ,两阶段布网方案的整体设计 (同步设计 ) ,可得到整体最优布网方案。为此 ,文中在布网方案设计空间、目标空间的基础上、增加了时间空间 ,提出了具有时间、目标、方案的三维多目标排序的优选方法来解决原建网和扩建网 ,两等级网布网方案的同步设计问题。它为多阶段、多等级控制网布网方案的设计开辟了新的途径。

With the expansion of construction and the scale of a city,an engineering control network in operation inevitably calls further expansion and the addition of new points and observation elements,due to change of required measuring accuracy and the need for network densification for network upgrading.For the layout of such a network composed of different orders,or a two phase or multi phase network,the selection of the position of center point and observation plan and accuracy,as well as the interaction of the latter two factors should be well considered.In view of the mutual dependency of the original and expanded network layouts,an overall optimum layout can be effected through synchronous design.In the paper,a 3 D multi target sequencing optimization method is proposed for making the synchronous design.The layout design features the combined consideration of layout scheme,target and time related factors.It provides a new approach for the layout design of such kinds of networks.