CAJ | 학술논문

为研究常见障碍物对无线信道的影响和构建日常生活环境下安全可靠的无线传感器网络，针对当前典型信道拟合公式精度低的不足，以433 MHz和2.4 GHz为载波频率，选择常见物体为障碍物；以接收信号强度指数、平均丢包率等为测试衡量指标，进行信道传播试验和数据分析，研究不同障碍物对信道和通信质量的影响，提出精度更高的分段数学拟合模型。试验结果表明，采用该文提出的无线信道数学模型具有更高的拟合系数R2；无线传感器网络工作频率越高，路径损耗越大；墙体对无线信道的影响最强，铁架最弱。选择铁门为障碍物进行验证试验，试验结果表明，分段拟合方案的拟合系数R2在0.97以上，分段数学模型可以提高拟合精度。
위연구상견장애물대무선신도적영향화구건일상생활배경하안전가고적무선전감기망락，침대당전전형신도의합공식정도저적불족，이433 MHz화2.4 GHz위재파빈솔，선택상견물체위장애물；이접수신호강도지수、평균주포솔등위측시형량지표，진행신도전파시험화수거분석，연구불동장애물대신도화통신질량적영향，제출정도경고적분단수학의합모형。시험결과표명，채용해문제출적무선신도수학모형구유경고적의합계수R2；무선전감기망락공작빈솔월고，로경손모월대；장체대무선신도적영향최강，철가최약。선택철문위장애물진행험증시험，시험결과표명，분단의합방안적의합계수R2재0.97이상，분단수학모형가이제고의합정도。
The typical mathematical model of radio channel has low accuracy. For deploying a wireless sensor net-works and studying the channel characteristics under everyday environment,using received signal strength index,the average lost packet rate,path loss as the measures,signal propagation experiments and data analysis are performed to study the obstacle impact on radio channel and communication quality with 433 MHz and 2.4 GHz as the carrier frequencies,using common object as the obstacles.Then a novel higher precision segmented mathematical model was proposed.At first,experimental results show that the new mathematical model of the radio channel has a higher re-gression coefficient R2.Second,the results demonstrate that the higher the carrier frequency of the wireless sensor network,the radio channel has the larger path loss.Besides,the wall has the strongest impact on radio channel,the weakest obstacle is iron nets.Selecting gates as obstacle,the verification experiments results show that the regression coefficient R2 of the new model is greater than 0.97,the segmented mathematical model could improve the accuracy.