ADS-B延迟时间计算方法的可行性分析

广播式自动相关监视(ADS-B)的延迟时间对监视精度有较大的影响,为了提高ADS-B的监视精度,提出一种精确计算每个ADS-B报文延迟时间的方法。根据ADS-B报文的接收时间和报文内容,可计算两相邻报文的时间间隔和对应报文中飞机两相邻位置的时间间隔,通过对两种时间间隔求差可得到ADS-B两相邻报文的延迟时间差,在初始报文中或者间隔一定时间发送飞机位置测量时刻的条件下,可计算其后所有报文的延迟时间,从而对延迟时间进行修正。最后在15min、25min和45min的ADS-B报文中分别随机选取1架飞机的报文利用Excel对该方法的可行性进行了分析。分析结果表明,采用该方法ADS-B的监视精度得到了很大的提高,在场面滑行的情况下,监视精度小于10m,满足场面监视的需要。

Feasibility analysis on method of calculating ADS-B latency

This paper proposed a method to accurately calculate ADS-B report latency in order to improve the surveillance accuracy of Automatic Dependent Surveillance-Broadcast(ADS-B) for the ADS-B latency had great influence on the surveillance accuracy.The time interval of two adjacent reports and the relevant two adjacent aircraft positions could be calculated on the basis of Time Of Receiving(TOR) and content of ADS-B reports.Then the different latencies were calculated by differencing the two time intervals.Given that the Time Of Measure(TOM) as the initial report time or a certain interval time,all the subsequent latencies could be measured and corrected.The authors carried out the feasibility analysis using Microsoft Excel by randomly selecting a aircraft ADS-B reports in 15 min,25 min and 45 min for ADS-B reports.The results show that ADS-B surveillance accuracy has been greatly improved within 10 meters,which can meet the requirement of airport surface surveillance.