Research on Over-reach Interference Propagations for Non-line-of-sight Terrestrial Digital Television

2011年实现了地面电视广播服务系统的数字化。然后，它是一个高频率利用率的系统。在临近地市，有时会出现系统的越区干扰问题。本文主要研究了由于昼夜和季节性大气条件的影响而引起的超程干扰问题。三年来，三个不同的天文台观察了地面数字电视广播性能。经证实，广播性能下降的影响，大气电波指数和干扰源的影响，通过监测附近的电视台广播的调频无线电波确定的超范围干扰。

A terrestrial television broadcasting service system was digitalized in 2011. Then, it was a high frequency-utilization-system. Over-reach interference problems on the system have been sometimes occurred around neighbor prefectures. It has been investigated on our study to research the over-reach interference problems due to diurnal and seasonal atmospheric conditions. The terrestrial digital television broadcasting performances have been observed at three different observatories for three years. It was confirmed that the broadcasting performances were degraded by over-reach interferences affected by the atmospheric radio wave index and the interference origins were identified by monitoring the FM radio waves broadcasted near the TV stations.