Inside GNSS Media & Research

MAY-JUN 2018

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Page 40 of 67 M A Y / J U N E 2 0 1 8 Inside GNSS 41 modulated distress messages trans- mitted onboard a flying aircra were recorded (in the same test environ- ment) to provide consistent data to compare the relative performances of both modulations for independent localization of fast-moving beacons. Scenarios The attention of the reader is drawn to scenario 2 (see Figure 9 ) which is completely automatic. Indeed, for this scenario the beacon was automatically triggered by a Beacon Activation Logic (BAL) based on GNSS information on the flight altitude of the test machine. For the sake of simplicity, the BAL used computed an automatic trigger based on an altitude threshold (instead of proximity with ground); the reader will anyway note the representativeness of the automatic activation process. Aer FIGURE 7 GRICAS demonstration equipment installed inside ACBS Cessna 182 (flight trials 1 and 3) FIGURE 8 GRICAS demonstration equipment installed inside the AS 350 B2 (flight trial 2) FIGURE 6 GRICAS demonstration platform: it integrates the GRICAS ELT(DT) and its remote control panel (center of the front face), a GNSS receiver emulating the GPS receiver of the avionics, and the power supply management system to adapt the power supply of the test aircraft or rotor- craft to the required power supply FIGURE 5 GRICAS flight trials take-off, the test pilot pursues the ascent until overtaking a threshold altitude (agreed with the GRICAS engineers and encoded as the threshold altitude in the BAL). e BAL, collecting the position data provided by the GNSS receiver of the demonstrator (emulating the GNSS receiver of the avionics for the tests), identifies the unusual altitude, com- putes a trigger "Unusual altitude" and

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