MOC2511 Enhanced Containment
The PRS-M4EX includes an External FTS (EFTS) module for Enhanced Containment Compliance under MOC2511. The PRS-M4EX uses both the PSDK FTS and an additional FTS signal that is sent to the DJI drone's ESC. The PRS-M4EX EFTS is triggered via a geofence function. This geofence will trigger when armed and when either a user-defined ceiling is breached, or a user-defined boundary is breached. The PRS-M4EX has an independent GNSS receiver that measures the position of the drone. The geofence is transferred to the PRS-M4EX via a USB-C cable connected to a laptop. See the Geofencingsection for more information on transferring the Geofence.
External FTS Limitations
Maximum number of activations: 400.
The GNSS receiver does not have range limitations; however, the user should define the ceiling based on the maximum Average Mean Sea Level altitude expected over the takeoff altitude
Minimum extent of Ground Risk Buffer: 56 meters (max speed of 15 m/s, 40 meter altitude, wind speed of 1 m/s)
30 + 1*15 + 1.1*W*40/3.80 = 56 meters (see equation below)
Ground Risk Buffer Prescription
The formula below provides a method to calculate the ground risk buffer zone for your operation according to the Specific Operation Risk Assessment. The max altitude (Alt) is based on the operation and is measured in meters. The descent rate should be based off the maximum takeoff weight which is 3.80 m/s. There is a maximum 30 meter buffer added to the PRS-M4EX geofence, which provides a buffer to avoid unintended triggers of the geofence when flying near the geofence. The speed is the drone's top speed measured in meters per second, which is multiplied by 1 second, as the PRS has a 1 second time buffer between breaching the geofence and triggering. The wind speed (Wind) is the environmental wind speed for that operation in meters per second (not including gust). The equation is as follows:
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