Nordseepilot schrieb:
FR24 zeichnet auch ohne ADSB-Out auf. Nicht ganz so genau und zuverlässig, aber ich persönlich finde meine Flüge regelmäßig in FR24, obwohl ich ADSB-Out noch nicht (ist geplant) installiert habe.
Heute was gelernt, danke für Hinweis.
In some regions with coverage from several FR24-receivers we also calculate positions of non-ADS-B equipped aircraft with the help of Multilateration (MLAT), by using a method known as Time Difference of Arrival (TDOA). By measuring the the time it takes to receive the signal from aircraft with an older ModeS-transponder, it′s possible to calculate the position of these aircraft. Four FR24-receivers or more, receiving signals from the same aircraft, are needed to make MLAT work. MLAT coverage can only be achieved above about 3,000-10,000 feet as the probability that four or more receivers can receive the transponder signal increases with increased altitude. Most parts of Europe and North America are today covered with MLAT above about 3,000-10,000 feet.