Inside GNSS Media & Research

MAY-JUN 2018

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Page 42 of 67 M A Y / J U N E 2 0 1 8 Inside GNSS 43 FIGURE 11 Automatic activation under detection of triggering criteria, here a maximum altitude threshold, representative of what the automatic activation under proximity with ground detection (altitude threshold trigger as well) could be France) used for the tests (in Dakar, Senegal, 3,600 kilometers far from Tou- louse, whereas the coverage area is a 3,000-kilometer-radius circle centered on Toulouse), i.e. outside the area where the performances of the MEOLUT are guaranteed. e performances obtained are ver y good considering the con- straints on the tests. The performance accuracy is a bit lower for the helicopter tests which can come from the interferences observed between the engine and the antenna used to transmit. Further tests will be performed in 2018 and 2019 onboard helicopters with adapted beacon and antenna solution. The Beacon/MEOLUT Latency During the field trial, the latency was inferior to 20 seconds bet ween t he activation of the beacon and the deliv- ery of the demodulated, independently localized and interpreted signal to the operator on testing site emulating the MCC. is means that the Cospas-Sar- sat MEOSAR based ADT solution can pretend to be a real-time flight distress tracking solution that would dramati- cally improve the efficiency of the SAR operators with a typical overall latency of one minute for the delivery of the dis- tress message to the operators. Conclusion Today, it appears that the Cospas-Sarsat MEOSAR system, relying on payload deployed on GNSS constellations (GPS, Galileo, GLONASS), offers all the con- ditions to meet the new requirement of ICAO for ADT system for Commercial Aviation, with a new generation of in- flight triggered beacons, identical to the current ELT in terms of aircra integra- tion, but capable of receiving triggers and cancellation events from the avi- onics, from the crew or from internal sensors, and of detecting and managing their inhibitions to maintain the capa- bility to raise alerts and be localized in any situation. The redundancy of the localization information (GNSS posi- tion encoded in the message and inde- pendent MEOSAR localization), the FIGURE 10 GRICAS demonstration equipment installed inside the ATR-42 (flight trial 5)

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