城市空间环境中电磁功率谱的探测

Detection of Electromagnetic Power Spectrum in Urban Space Environment

随着经济的发展,城市环境空间中充斥电磁能量。如果加以妥善利用,空间电磁能可成为某些应用的新能量来源。为了解我国城市空间环境中的电磁能量的能级水平,探测我国城市环境中电磁功率谱分布,利用天线作为探测探头,通过主控制器的信息处理及电脑平台实时显示功能,设计了一种超宽带环境电磁功率探测仪,并实际测试了成都市多个典型环境的空间电磁功率谱。测试结果表明,不同环境中的空间电磁功率谱存在较大差异,其中在1 9202 170MHz和2 4002 500MHz频带处(对应通信频段3 G、Wi-Fi)有较强的电磁能量分布,最高功率密度可达到约75 nW/cm^2。

With the development of economy, more and more electromagnetic （ EM ） energy exists in urban environment. If it is properly used,the spaee electromagnetic energy can be a new energy source for some applications.In order to know the EM energy level and investigate the EM power spectrum distribution in urban space environment, an ultra-wideband EM power detector is designed through the information processing of the main controller and the real-time display function of the computer platform.And the spatial EM power spectrum in several typical locations of Chengdu is tested. The test results show that the EM power spectrums in different environments are quite different. Normally, there exists strong EM energy in frequency bands of 1 920 - 2 170 MHz and 2 400 - 2 500 MHz（ corresponding to 3 G wireless communication and Wi-Fi） ,and the spatial EM power density can reach to a maximum value of about 75 nW/cm^2.