TheodoreRex
lvl.2
Flight distance : 686975 ft
United States
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Having Multiple Monitors for the same variable is key in Aviation. The Airbus has three of everything for critical system. . . there will be a HORIZON for the Pilot, a Horizon for the 1st Officer, and a third HORIZON on the central console as a breaker of any ties. . . 99.99% they all agree. . . but when they don't, 2 out of 3 wins.
The Phantom has several inputs but chooses to use only a select few. SONAR (which appears limited to Near-Ground Operations. . . at it reads "8.3 feet" when at 390 feet). . . IMU's which measure acceleration/inertial changes which, when integrated, can give an every increasing error distance from Home-Point. . . GPS, which is converted into 2D Long/Lat coordinates for display. In very small distances, the SONAR is probably the most accurate. . . then GPS, then Barometer. . .
Whatever Formula DJI is using it would be completely unacceptable in commercial Aviation.
When combining the Altititude Errors with a WAYPOINT MISSION you are in for serious trouble. Easily reproduced in my Bird... fly around a park... set a few waypoints with reference to KNOWN heights (my son and I took a 100 FT measuring tape to a local park and ran this experiment)... then run the mission. The Long/Lat mission was nearly flawless... the ALTITUDE was off as much as 16 feet when the highest point of the mission was only 55 feet. At one point, the bird was 9 feet off the ground (I could almost touch it) saying it was 22 feet. The Backstop of a Baseball park, measured with tape at 15' 11" was coming in at 28 feet. But, as the Bird hovered... the altitude slowly dropped... 25'.. then 22'... then 19'.. .then 17' then finally 16'. The BAROMETER IS LAGGY.
This absolutley reinforces the axiom... "YOU MUST MAINTAIN VISUAL LINE-OF-SIGHT AT ALL TIMES... in order to recovery the bird should it go awry..." Yes... safe... but the buggy Altimeter severly limits my options of AUTOMATED missions.
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