Design and Evaluation on Onboard Antenna Pointing Control System for a Wireless Relay System Using Fixed-Wing UAV
Abstract
:1. Introduction
2. The Antenna Pointing Control System
2.1. Mechanical Antenna Pointing Control
2.2. Proposed Antenna Pointing Control System
3. Antenna Pointing Direction and Its Blockage by UAVs
3.1. Target Commands of Antenna Driving Angle
3.2. Fluctuation of the Antenna’s Drive Angle due to Turning
3.3. Roll Angle to Avoid Blocking
3.4. Blocking Judgement Flow
4. Size and Target Pointing Accuracy of Antennas
5. Design of the Antenna Pointing Control System
5.1. Configuration
5.2. Equation of Motion for the Fixed-Wing UAV and Two-Axis Gimbals
5.3. Design
5.4. Control Frequency of Antenna Driving Control System
6. Evaluation of Antenna Pointing Control Error
6.1. Conditions
6.2. Stability Analysis
6.3. Results
7. Conclusions
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
Abbreviations
vector of pointing | target turning flight velocity | ||
horizontal distance | wind disturbance | ||
antenna diameter | unit vector of UAV’s X-axis | ||
control frequency of antenna drive | Z element of | ||
H | flight altitude | ratio of radius and altitude | |
the converted block elements | ratio of horizontal distance and altitude | ||
moment or product of inertia | pitch angle of UAV attitude | ||
ratio of fluctuation beam to drive | antenna pointing accuracy | ||
L | moment of X body axis | elevation angle | |
M | moment of Y body axis | control error of elevation | |
N | moment of Z body axis | interference factor | |
unit vector of UAV’s Z-axis | standard deviation of sensor noise | ||
p | angular velocity of X axis | standard deviation of pointing error | |
q | angular velocity of Y axis | roll angle of UAV attitude | |
r | angular velocity of Z axis | yaw angle of UAV attitude | |
R | turning radius | azimuth angle | |
control torque of two-axis gimbal | control error of azimuth | ||
turning flight velocity | angular velocity of UAV | ||
Subscripts | |||
A | antenna pointing | ||
B | in the body frame coordinate | ||
G | gimbal driving | ||
GC | target command of gimbal driving | ||
x, y, z | body axis or gimbal axis | ||
1, 2 | block number |
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Electrical Scanning | Mechanical Scanning | |
---|---|---|
Gain fluctuation | Large | Small |
Pointing accuracy | Inverse proportional to number of arrays | Constant |
Weight | Inverse proportional to pointing accuracy | Constant |
Complexity | Proportional to number of arrays | Constant |
37.4 | ||
25.2 | ||
55.7 | ||
0.033 | ||
0.01 | ||
0.01 |
- | 0.15 | |
- | 7.5 | |
[m/s] | 30 | |
[m/s] | 10 |
Attitude () | [deg.] | 0.5 |
H | [m] | 0.2 |
RF sensor | [deg.] | 0.1, 0.05, 0.01 |
[m/s] | 0.17 | |
GPS position | [m] | 1 |
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Hamajima, K.; Yasukawa, K.; Ueba, M.; Kanou, H.; Matsui, M.; Abe, J.; Itokawa, K.; Yamashita, F. Design and Evaluation on Onboard Antenna Pointing Control System for a Wireless Relay System Using Fixed-Wing UAV. Aerospace 2023, 10, 323. https://doi.org/10.3390/aerospace10040323
Hamajima K, Yasukawa K, Ueba M, Kanou H, Matsui M, Abe J, Itokawa K, Yamashita F. Design and Evaluation on Onboard Antenna Pointing Control System for a Wireless Relay System Using Fixed-Wing UAV. Aerospace. 2023; 10(4):323. https://doi.org/10.3390/aerospace10040323
Chicago/Turabian StyleHamajima, Koki, Kei Yasukawa, Masazumi Ueba, Hisayoshi Kanou, Munehiro Matsui, Junichi Abe, Kiyohiko Itokawa, and Fumihiro Yamashita. 2023. "Design and Evaluation on Onboard Antenna Pointing Control System for a Wireless Relay System Using Fixed-Wing UAV" Aerospace 10, no. 4: 323. https://doi.org/10.3390/aerospace10040323