中文摘要：

为了研究自然环境下超高压输电线路和空中目标的电晕放电辐射信号的远场特性，研究了其辐射规律。采用窄带测试原理搭建了测试系统，通过外场实验得出了电晕放电辐射信号强度随着充电电压的增加而增加、随着探测距离的增加而衰减的规律。以此为基础，设计了高灵敏度、低噪声的电晕放电测试系统，成功地在自然环境下200-300MHz频段内探测到距离170m处的超高压塔电晕放电辐射信号。实验结果表明：该测试系统能灵敏地探测一定距离范围内的电晕放电辐射信号，为野外自然环境下超高压输电线路和空中目标的电晕放电信号远距离探测提供了技术手段。

英文摘要：

In order to obtain the far-field characteristics of corona-discharge-induced radiation signal （CDRS） from ultra high voltage （ UHV） transmission lines and air targets in natural environments, we experimentally investigated the radiation, and established a test system using the narrowband test principle. Field experiments indicated that the strength of CDRS increased with the charging voltage, but it decreased with increasing detect distance. There by a test system of corona discharge with high sensitivity and low noise was designed. Using the system, we detected CDRS within 200-300 MHz at a distance of about 170 m from UHV towers in natural environment. It is concluded that the system can be used to detect CDRS within a certain distance from corona, and provide a method for long- range detection of CDRS in natural environments.