According to the models of the link length and visibility for multiple satellite constellations, the multi-layer mathematic model of the satellite network was built in this paper.
根据多层卫星星座网络的链路长度与可见性模型，建立了多层卫星网络的数学模型，并据此提出了一种适于多层卫星网络应用的层次路由协议。
Through these models, multi-layer management of both geometric and non-geometric information can be realized.
引入特征工作面定位各个特征，实现信息模型的几何表示。
Suitable for laying-off multi-layer material and large materials in huge weight, complete specifications and models, custom-made too.
适用于多层材料和大吨位的下料，规格品种齐全，并可定做。
Suitable for laying-off multi-layer material and large materials in huge weight, complete specifications and models, custom-made too.
适用于多层材料和大吨位的下料，规格品种齐全，并可定做。
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