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1. 北京航空航天大学 可靠性与系统工程学院, 北京 100191;
2. 可靠性与环境工程技术重点实验室, 北京 100191

Accelerated testing for data integrity of Ad hoc network in complex environment
ZHANG Nan1, LI Ruiying1,2 , HUANG Ning1,2
1. School of Reliability and Systems Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China;
2. Science and Technology on Reliability and Environmental Engineering Laboratory, Beijing 100191, China
Abstract:In order to evaluate the data integrity of Ad hoc network under its mission scenarios in an efficient way, an accelerated testing method was proposed. The similarity models for the key parameters of data integrity, i.e. the effective signal-to-noise ratio, the traffic and the moving speed, were derived based on the similarity theory, which finally composed the similarity model of data integrity. The case study on a relief Ad hoc network verified the effectiveness of the similarity model based on OPNET simulation tools. The results show that the error between the original network and the similar one is very small, and the effectiveness of the similarity model does not change with the failure threshold, stress increase times and the topological structure.
Key words: similarity theory     Ad hoc network     data integrity     similarity model     bit error rate

1 基本概念

2 相似模型

 调制方式 关系式
 BPSK Pe=${\textstyle{1 \over 2}}erfc\left( {\sqrt r } \right)$ BASK Pe=${\textstyle{1 \over 2}}erfc\left( {\sqrt {r/4} } \right)$ BFSK Pe=${\textstyle{1 \over 2}}erfc\left( {\sqrt {r/2} } \right)$

2.1 有效信噪比的相似模型

1) 自由空间模型视天线处在真空之中,不考虑任何大气的影响,不被障碍物遮挡,其传播损耗模型为

2) Longley-Rice模型根据天线高度和地形参数计算无线电波的反射、折射和绕射、地面反射,并结合自由空间传播损耗公式,综合考虑、地面反射和地形衍射,计算路径损耗.传播损耗Lp计算方法为

2.2 流量生成与空间移动相似模型

2.3 数据完整性相似模型

3 案例验证

3.1 参数设置

3.2 仿真验证

 图 1 网络拓扑及移动路径Fig. 1 Network topology and moving path

 参数 数值 表面折射率 300 相对介电常数 15 大地导电率 0.05 湿度 300

4个无线通信节点A、B、C、D的拓扑结构和移动路径(X1→X2→X3→X1,X=A,B,C,D)如图 1所示.

 图 2 原始网络仿真结果Fig. 2 Simulation results of original network

 图 3 相似网络仿真结果Fig. 3 Simulation results of similar network

 Emax 均值${\rm{\hat I}}$ 方差${\rm{\hat I}}$/10-6 均值${\rm{\hat I}}$' 方差${\rm{\hat I}}$'/10-6 相对误差/10-4 0.00003 0.87934 244 0.879444 240 1.18 0.00004 0.957463 15.5 0.95788 15.4 4.35 0.00005 0.969064 6.33 0.969182 6.40 1.22 0.00006 0.978839 1.44 0.978916 1.51 0.787 0.00007 0.981152 0.933 0.981125 0.945 0.275

 α 均值${\rm{\hat I}}$ 方差${\rm{\hat I}}$/10-6 均值${\rm{\hat I}}$ 方差${\rm{\hat I}}$'/10-6 相对误差/10-4 2 0.978839 1.44 0.978915 1.52 0.776 4 0.978839 1.44 0.978957 1.58 1.21 6 0.978839 1.44 0.978666 2.60 1.77 8 0.978839 1.44 0.978311 1.18 5.39

 图 4 改变后的拓扑结构和移动轨迹Fig. 4 Changed network topology and moving trace

 图 5 原始网络和相似网络的数据完整度对比Fig. 5 Comparison of data integrity between original and similar networks
4 结 论

#### 文章信息

ZHANG Nan, LI Ruiying, HUANG Ning

Accelerated testing for data integrity of Ad hoc network in complex environment

Journal of Beijing University of Aeronautics and Astronsutics, 2015, 41(8): 1520-1525.
http://dx.doi.org/10.13700/j.bh.1001-5965.2014.0612