基于软件无线电的城区人为无线电噪声测量与建模研究
Measurement and Modeling of Urban Man-Made Radio Noise Based on Software-Defined Radio
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摘要: 近年来，随着电子设备种类和数量的剧增，城区人为无线电噪声水平已发生巨大变化，国际电信联盟(ITU)提供的关于无线电噪声的计算方法及参考值显然已无法满足当前无线电系统设计和性能评估要求。因此，本文利用USRP X310软件无线电系统在青岛城区开展了大范围、宽频段人为无线电噪声数据测量，采用针对移动测量的改进干扰信号处理方法，建立了新的城区人为无线电噪声模型。新模型较ITU-R P.372-17国际标准模型具有更高的预测精度，同时新模型的最高适用频率较ITU-R P.372-17模型的250MHz提高到500MHz。数据分析表明，当前城区人为无线电噪声水平明显高于ITU-R P.372-17模型给出的参考值。新建模型可为城区无线电系统的频谱规划、干扰分析和信号检测等提供基础支撑。Abstract: With the rapid increase in the variety and quantity of electronic devices, man-made radio noise levels have significantly changed. As a result, calculation methods and reference values for man-made radio noise provided by the International Telecommunication Union (ITU) are no longer sufficient to meet the current requirements for the design and performance evaluation of radio systems. Therefore, the measurement and analysis of man-made radio noise in urban areas are important. Software-Defined Radio (SDR) has become a key tool for radio noise measurement. A measurements of urban man-made radio noise based on USRP X310 SDR platform was conducted in Qingdao. An improved interference signal processing method was proposed, and a new urban man-made radio noise model was developed. Comparison showed that the new model obtained more accuracy than the ITU-R P.372-17 model, meanwhile its maximum applicable frequency extended from 250MHz to 500MHz. Data analysis reveals that current urban radio noise levels are significantly higher than the reference values reaccommodated by the ITU-R P.372-17. The new model provide foundational support for spectrum planning, interference analysis, and signal detection.
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