IEEE - Aerospace and Electronic Systems - March 2023 - 8

A Drone-Based Multisensory Payload for Maritime Pollutants Detections
Table 3.
Sensors Weights and Overall Payload Weight
Sensor
Radar þ
Teltonika
Sony Alpha
6000
MicaSense
Altum
1010 g
Spatial Dual 795 g
344 g
407 g
LTE Wi-Fi connections and allows us to manage and
control the radar functionality. The SIM card allows
operating the radar using the 4G communication link.
The radar developed by Echoes is already meant for
being remotely managed, however the connection
through a mobile internet access presents some peculiar
restrictions that must be carefully taken into account.
Specifically, network operators employ a variety of techniques
to extend the life of IPv4 addressing. One such
technique is the use of large scale network address translation
(also known as Large Scale NAT-LSN or Carrier
Grade NAT-CGN). LSN allows a large number of
IPv4-enabled end devices to share a single public IPv4
address. In the described network scenario, the radar is
not reachable by the radar control station based in Pisa
since it is under the mobile operator's LSN. A virtual private
network (VPN) is a possible way to overcome this
restriction. The implemented VPN solution is one of the
best-known open source VPN solutions named
OpenVPN.
The network configuration setup during the POSEIDON
trials is depicted in Figure 4. The router is configured
to automatically login into the VPN server (hosted at
RaSS Lab in Pisa) in order to establish the encrypted VPN
tunnel. The radar control station and other clients connect
as well to the VPN and start communicating on the same
virtual private network. A custom configuration on the
server has been created in order to guarantee a static private
IP to each of the authorized hosts. In this way, the
radar and the router IPs were known during each trial session.
The latency of the connection between the VPN
server and the radar measured during the experimental
flights was always less than 80 ms. This latency implies a
very responsive control of the radar system through the
custom GUI.
2556 g
Table 4.
Weight Overall payload
weight
Absorption Requirements of the Radar Unit and Its
Components
Unit
Absorption
Radar
Spatial Dual
Teltonika
18-28 VDC, 20 W
9-36 VDC, 3 W
9-30 VDC, 5 W
Figure 2.
Integration of each sensor separately, from left to right: radar, cameras, and Spatial Dual antennas.
Figure 3.
Fully integrated system with a detail on the payload (right side image).
8
IEEE A&E SYSTEMS MAGAZINE
MARCH 2023

IEEE - Aerospace and Electronic Systems - March 2023

Table of Contents for the Digital Edition of IEEE - Aerospace and Electronic Systems - March 2023

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