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随着社会不断发展及军事、民用的需要，人防工程的综合开发和利用，已成为城市交通、商业和旅游的发展需要。而地下建筑的无线通信问题也随之越来越突出，地下无线信号不能与地面进行正常沟通，已成为制约人防工程及地下民用建筑系统有效开发的瓶颈问题。 为确保地下建筑在遭受
With the continuous development of society and military and civilian needs, the comprehensive development and utilization of civil air defense projects have become the needs of the development of urban transportation, commerce and tourism. However, the wireless communication problem of underground buildings also becomes more and more prominent. The underground wireless signals can not communicate with the ground normally. This has become a bottleneck that restricts the effective development of both civil air defense systems and underground civil building systems. To ensure that the underground building is suffering