• PERFORMANCE OF THE EXTENDED TIME DIVERSITY TECHNIQUE IN REAL FLIGHT TEST CONDITIONS

      Blanc, Grégory; Skrzypczak, Alexandre; Pierozak, Jean-Guy; ZODIAC AEROSPACE - ZODIAC DATA SYSTEMS (International Foundation for Telemetering, 2017-10)
      The emission of the telemetry signal is required over minimum two different antennas to keep the telemetry link available during a maneuver of a flying object. If nothing is made at the transmitter side, the telemetry link can be fully lost as both signals may have an opposite phase. This is the well-known “2-antennas problem”, also known as the “porcupine effect”. In 2016, Zodiac Data Systems (ZDS) presented a pragmatic and cost effective concept named eXtended Time Diversity (XTD) which is dedicated to combat the porcupine effect. The efficiency of this concept was demonstrated through lab tests, as well as its robustness in presence of multipath. The goal of this paper is to present the performance of the Extended Time Diversity in real conditions, after a series of flight tests.