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A study of uncompensated latency in ADS-B reports

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Document pages: 7 pages

Abstract: The total latency (TL) in ADS-B is the difference between the true TOA of theoriginal position measured by the onboard GPS and the TOA in the ADS-B reportat the GS. We processed the ADS-B reports extracted from live-data recorded atthe Chicago to produce the results in this report. We observed that 99 ofaircraft in our data set were broadcasting in non-UTC coupled mode. For theseaircraft, STARS exclusively used ADS-B reports to update tracks when available.The calculated ULs for the non-UTC coupled ADS-B reports were well within thebudget (-200 ms to +400 ms) allowed by the DO-260B MOPS. Moreover, the meanlatencies from both methods were less than + -50 ms. The latencies obtainedfrom the MTPES method were observed to be in close agreement with the meansfrom the ATPE method. About 1 of aircraft were broadcasting in UTC coupledmode. The reports from these aircraft were identified to have a non-compliantlink version, causing STARS to reject these reports for tracking. Moreover, thereported position and TOA were found to be unsynchronized, which conflicts withthe MOPS requirement for UTC coupled operation.

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