随着城市建设和经济的不断发展，政府应急部门如公安系统承担的社会维稳、大型警卫及安保工作日益艰巨复杂，新的形势和任务对无线通信保障工作提出了更高要求，要求在应急指挥、调度上能做到全天候、全地域、无缝隙连接。这就需要借助数字集群与卫星异构组网系统来扩大应急指挥网络的覆盖范围，使其能延伸到单一系统无法覆盖的区域。而目前基于卫星链路的应急通信系统通常面临终端体积过大、无法实现单兵便携的问题，且部分系统由于未充分考虑通信卫星的实际覆盖能力而不足以解决应急集群通信系统中的所有盲区问题，这严重制约了相应装备的推广应用。基于此，设计了基于便携式卫星站的数字集群异构组网系统，极大降低了传统车载地面站的成本，充分解决了车辆无法到达区域的盲点区问题。随后在多种典型的应急通信应用场景下进行系统的外场测试，充分验证了该异构组网系统方案的可行性和可靠性。

With the development of city construction and economy, emergency departments of the government like the public security system are bearing heavier burdens of large-scale security service and social stability maintenance. The new situations and mission put forward higher requirements that wireless telecommunication should work well in spite of weather and regions in emergency commanding and scheduling. Heterogeneous networking system of digital trunking and satellite communications is needed to expand the coverage of emergency commanding network into areas which can’t be covered by simple systems, such as remote mountains and forest, earthquake-stricken area and so on. Now, emergency communication systems based on satellite link are faced with oversized terminal and portable problems. Furthermore, because the actual coverage capacity of communication satellites are not taken into enough consideration for some systems, the problem of the all blind areas of emergency communication systems still can’t be solved which seriously limits the popularization and application of relevant devices. A digital trunking heterogeneous networking system based on portable satellite station is designed, which greatly reduces costs of the traditional vehicle-borne satellite communication earth station and also solves the blind problem of inaccessible areas for vehicle. Then field tests of this system are carried out under various typical emergency communication application scenarios, which fully proved the feasibility and reliability of the system.