星基ADS-B接收机监视容量分析

星基广播式自动相关监视（ADS-B）系统是实现广域范围内航空器监视的重要技术手段。星基ADS-B系统内部存在严重的共信道干扰，共信道干扰限制了系统的监视性能。为了定量给出星基ADS-B接收机监视容量的计算方法，首先，给出了星基ADS-B系统的模型；随后，通过理论分析得到了星基ADS-B接收机报文冲突概率及报文正确接收概率，以此为基础理论，分析得出星基ADS-B接收机位置报文更新间隔及监视容量的计算方法；最后，构建了星基ADS-B仿真系统，仿真验证了理论计算公式的正确性。研究表明：星基ADS-B接收机的监视容量由飞机-卫星空天链路的误码率及ADS-B应用子系统所要求的位置报文更新间隔联合决定。

Performance analysis of surveillance capacity of satellite-based ADS-B receiver

Satellite-based Automatic Dependent Surveillance-Broadcast (ADS-B) is an important technology for wide-area aeronautical surveillance. Experiments show that the surveillance performance provided by the satellite-based ADS-B system deteriorates seriously due to co-channel interference within the system. To quantitatively analyze the surveillance capacity of the satellite-based ADS-B system, a model for the satellite-based ADS-B system is developed. The collision probability and the correct reception probability of messages sent by the ADS-B transmitter of civil aircraft are theoretically derived. The update intervals of position messages and the surveillance capacity of the satellite-based ADS-B receiver are obtained. Simulation results verify the correctness of these theoretical results. Our study shows that the surveillance capacity of the satellite-based ADS-B receiver is jointly determined by the symbol error rate of the aircraft-satellite link and the required update interval of the ADS-B application subsystem.