Availability Evaluation Of Surveillance Performance On Space-Based ADS-B

As the future major surveillance system determined by the International Civil Aviation Organization.Automatic Dependent Surveillance-Broadcast(ADS-B)combines advanced technologies such as navigation,communication,surveillance,airborne equipment and ground reception station.ADS-B obtains aircraft related information through the ground reception station.Ground station has high cost,complexity technique and it is hard to build in deserts,polar,seas,and other regions.In order to make up for these deficiencies,ADS-B receiver can be built on satellite to monitor and control the global air traffic.In 2015,the TT-3 micro satellite designed by National University of Defense Technology has been lunched successfully.This satellite carried ADS-B receiver that can receive the message of aircraft in real time.For this study,a dataset of space-based ADS-B messages was analyzed and arranged.Next,the three evaluation indexes of Required Surveillance Performance(RSP)had been analyzed include Update Interval,Data Integrity and Data Accuracy.Finally,the availability of Space-Based ADS-B was evaluated.According to the receipt time and position messages,the value of the predict Horizontal Protection Limit(HPL)is calculated by using the Receiver Autonomous Integrity Monitoring(RAIM)algorithm through MATLAB simulation to compare with the requirement of Navigation Integrity Category(NIC).Compared with the required monitoring performance requirements.The results show that the number of daily average receiving messages is less,the packet loss rate is higher.Update interval of the message is higher,the integrity and accuracy of data are better.Finally,the availability of Space-Based ADS-B is 74.52%.This system hasn’t met the 99.9% requirement of the required monitoring performance availability.