无人机编队指多无人机协作执行任务的过程中,无人机群保持几何形状排列,如V字形、环形等。采用马尔科夫链节点状态模型,对基于载波侦听多路访问/冲突避免(Carrier Sense Multiple Access with Collision Avoid,CSMA/CA)协议的多接口无...无人机编队指多无人机协作执行任务的过程中,无人机群保持几何形状排列,如V字形、环形等。采用马尔科夫链节点状态模型,对基于载波侦听多路访问/冲突避免(Carrier Sense Multiple Access with Collision Avoid,CSMA/CA)协议的多接口无人机环形编队自组网容量进行分析,推导出节点包碰撞概率、发包概率和网络吞吐量参数的关系模型,提出了网络容量分析方法。通过仿真验证了网络容量分析方法的合理性,并给出了吞吐量随网络节点数、接口数变化的性能结果以及包碰撞概率、发包概率随接口数、竞争节点数变化的理论特性。展开更多
The water characteristic curve for aeolian sand in two processes of wetting and drying was obtained by the negative water column technique.The values of fitting parameters were calculated according to Van Genuchten fo...The water characteristic curve for aeolian sand in two processes of wetting and drying was obtained by the negative water column technique.The values of fitting parameters were calculated according to Van Genuchten formula and the parameters that characterized the prosperities of aeolian sand such as the unsaturated infiltration coefficient and specific water capacity were obtained.The results showed that the water characteristic curve for aeolian sand in wetting process had greater hysteresis quality than ...展开更多
文摘无人机编队指多无人机协作执行任务的过程中,无人机群保持几何形状排列,如V字形、环形等。采用马尔科夫链节点状态模型,对基于载波侦听多路访问/冲突避免(Carrier Sense Multiple Access with Collision Avoid,CSMA/CA)协议的多接口无人机环形编队自组网容量进行分析,推导出节点包碰撞概率、发包概率和网络吞吐量参数的关系模型,提出了网络容量分析方法。通过仿真验证了网络容量分析方法的合理性,并给出了吞吐量随网络节点数、接口数变化的性能结果以及包碰撞概率、发包概率随接口数、竞争节点数变化的理论特性。
基金Supported by Key Project of Science and Technology Research of Ministry of Education(308021)Chang Jiang Scholars Innovation Team of Ministry of Education(IRT0811)Geological Survey Project of China Geological Survey(1212010331302)~~
文摘The water characteristic curve for aeolian sand in two processes of wetting and drying was obtained by the negative water column technique.The values of fitting parameters were calculated according to Van Genuchten formula and the parameters that characterized the prosperities of aeolian sand such as the unsaturated infiltration coefficient and specific water capacity were obtained.The results showed that the water characteristic curve for aeolian sand in wetting process had greater hysteresis quality than ...