共信道干扰环境下星基ADS-B系统监视性能

星基广播式自动相关监视系统（星基ADS-B）是实现广域范围内航空器监视的主要技术手段。为揭示星基ADS-B系统共信道干扰对系统监视性能的影响，提出了星基ADS-B系统监视容量的计算方法。首先给出了星基ADS-B系统模型，随后理论分析给出消息正确接收概率、位置消息更新间隔及位置报告更新间隔的计算公式，以此为基础给出了星基ADS-B系统监视容量的计算公式，最后基于SNS软件构建了星基ADS-B仿真系统，仿真验证了理论结果的正确性。研究表明：星基ADS-B系统的监视容量由ADS-B应用子系统所要求的航空器位置报告更新间隔、航空器-卫星链路的误码率、星-地面站链路的误码率及卫星数目联合确定。

Surveillance performance of satellite-based ADS-B system in co-channel interference environment

Satellite-based ADS-B system is an important technical scheme for wide-area aircraft surveillance system. To reveal the influence of co-channel interference on the surveillance performance of the satellite-based ADS-B system, a theoretical formula of the surveillance capacity of the system is proposed. Firstly, the model of satellite-based ADS-B system is given. Then, the correct reception probability of ADS-B message, the update interval of aircraft position message, and the update interval of aircraft position report are theoretically derived. Based on these equations, the surveillance capacity of the system is given. Finally, these theoretical formulas are verified by computer simulations using the Space Network Simulation (SNS) software. Our study shows that the surveillance capacity of the satellite-based ADS-B system is jointly determined by the symbol error rate of aircraft-satellite links, the symbol error rate of satellite-earth links, the number of satellites, and the required update interval of the ADS-B application subsystem.