Analysis of signal strength characteristics based on typical operation site of power grid

Following the continuous development of communication technology, under the background of smart power construction, in order to further meet the needs of communication, panoramic monitoring and security management of on-site personnel in power grid emergency operations, the key technologies of multi-frequency and multi-modal fusion communication are studied by analyzing the coverage of strong and weak signals in typical power grid application scenarios, and a portable multi-network fusion signal enhancement terminal device is developed. Realize multi-band signal sharing and interworking, support the field video terminal to switch between different operators’ signals, covering various typical operation scenarios. The results show that under the application of HD AF MIMO wireless relay transmission technology, SINR and other performance indicators are improved, the wireless relay gain efficiency can be increased by about 10 dB, the signal coverage distance in the operation blind area is significantly enhanced, the voice interaction quality is significantly improved, the video transmission is smooth, and the communication quality is significantly improved. Therefore, in the typical operation site of the power grid, the device can effectively realize the dynamic spectrum allocation of the three networks and the integration and flexible coverage of $4-5 \mathrm{G}$ signals, and solve the problem of emergency intelligent management of the grid operation signal blind area.