International Core Journal of Engineering 2020-26 | Page 175

coordinates to achieve effective rescue of the distressed
personnel. In the design of the aircraft part of the interactive
communication system, considering the expected working
range and wide distance, the Bluetooth or WIFI
communication mode of the common small drone is
abandoned, and the flight attitude is relatively stable and the
receiving signal is far away. The main control board of the
N3 aircraft with four rotors (Figure 2).
distressed area. Cooperate with the first-class main aircraft to
carry out search and rescue work and complete
communication with the rescue center.
III. F EASIBILITY ANALYSIS
A. Analysis of communication methods
The bionic boat part of the communication system,
working and recycling uses ultra-wideband (UWB)
technology, which does not use a carrier, but uses a short
energy pulse- sequence and spreads the pulse to a frequency
by orthogonal frequency division modulation or direct
sequencing. Within the scope. It is using the most popular
TDOA technology for positioning. The principle is that the
technology adopts TDOA (the principle of arrival time
difference), and uses UWB technology to measure the time
difference of the radio signal propagation between the
positioning tag and the two different positioning base
stations, thereby obtaining the distance of the positioning tag
from the four sets of positioning base stations. (Assume that
1# and 2# are the first group, 2# and 3# are the second group,
3# and 4# are the third group, and 4# and 1# are the fourth
group).
Figure 2. N3 aircraft top view.
In actual work, when sailing for different purposes, a
first-class main aircraft fleet of different colors with different
specific functions will be dispatched, and a second-class
bionic unmanned fleet of different functions will be equipped
to realize various types of emergencies. Targeted sailing.
This type of search and rescue can guarantee real-time
control of each search and rescue unit, while ensuring
comprehensive and efficient search and rescue, and can
complete the search for the risk area in the shortest time.
(1)
(2)
(3)
B. Bionic Fleet Design and Control
The main working unit in the communication system -
the part of the bionic unmanned boat fleet, is the rhinoceros
completed the appearance modeling, using ABS synthetic
plastic as the material, using 3D printing technology to
realize the production of the fish-like bionic shell, the upper
detachable The sensor port, the internal control chip is a
forever-12 chip that can realize Bluetooth communication
with the main console, and uses 2.4GHZ frequency to
control the stepping motor and its connected propeller as the
power of the bionic boat.
(4)
to
are distance differences of
In the formula,
the positioning tags measured by the UWB technology with
respect to the four groups of base stations.
-
Due to the actual work, the water environment of
unmanned boats during search and rescue is rarely known,
and most of them are partially known or completely
unknown. Therefore, the unmanned boat needs to constantly
interact with the environment during the work process and
update the environmental information to improve the
efficiency of the unmanned ship. Therefore, after each
underwater unmanned boat is equipped with an underwater
camera and a sensor, it can perform position estimation,
positioning and path planning, complete the interactive
communication between the bionic boat and the main aircraft,
and pass between various obstacles. The angle and distance
are used to identify and remember to determine if the area
has been mapped [3]. (5)
After a large number of such bionic boat individuals are
placed, the UWB base station on the main aircraft can be
used to communicate with other secondary work units,
forming a network of four scattered search and rescue, and a
temporary search and rescue system is rapidly formed in the -
-
(6)
-
(7)
(8)
The specific coordinates of the positioning tag can be
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