Preliminary Analysis of Performance Variation for ADS-B Position

Abstract

This paper is concerned with the preliminary investigation of Automatic Dependent Surveillance – Broadcast (ADS-B) positional performance while the aircraft moves in the sky and on the ground. ADS-B broadcasts own position and other various operational information. Although each position is calculated by GNSS, positional accuracy changes depending on the flight situation and on-board devices. Blocking the GNSS signals and multipath immunity result in the performance degradation. Navigation integrity category (NIC) and navigation accuracy category-position (NACp) are provided as positional performance values of ADS-B. In this paper, analytical results of ADS-B regarding aircraft positions are shown. Statistical results of NIC and NACp on airborne and airport surface are demonstrated. In addition, focusing on an aircraft, the variation of performance values is presented. Causes of changing positional performance are discussed.