scholarly journals Embedded Software of Automatic Sector Switching Antenna System for UAV Data Link and SOTM

2018 ◽  
Vol 181 (7) ◽  
pp. 5-9
Author(s):  
Ravi Kant ◽  
Pramod Kumar ◽  
Vinod Kumar
Keyword(s):  
Embedded Software ◽  
Antenna System ◽  
Data Link ◽  
Sector Switching

scholarly journals Study of Rotation and Bending Effects on a Flexible Hybrid Implanted Power Transfer and Wireless Antenna System

Sensors ◽  
2020 ◽  
Vol 20 (5) ◽  
pp. 1368 ◽  
Author(s):  
Reem Shadid ◽  
Mohammad Haerinia ◽  
Sima Noghanian
Keyword(s):  
High Frequency ◽  
Rotation Angle ◽  
Data Communication ◽  
Transmission Efficiency ◽  
Antenna System ◽  
Communication Link ◽  
Transmitted Power ◽  
Data Link ◽  
Tissue Model ◽  
Bending Radius

We present rotational misalignment and bending effects on a hybrid system to transfer power and data wirelessly for an implantable device. The proposed system consists of a high-frequency coil (13.56 MHz) to transfer power and an ultra-high frequency antenna (905 MHz) for data communication. The system performance and the transmitted power were studied under two misalignment conditions: (1) receiver rotation around itself with reference to the transmitter, and (2) bending of the implanted receiver under three different radii. Implanted receiver was printed on a flexible Kapton substrate and placed inside a layered body tissue model at a 30 mm depth. It is shown that the inductive link is stable under rotational misalignment and three bending conditions, whereas the communication data link is suitable to be used if the rotation angle is less than 75° or larger than 150°. The results show that the resonance frequency varies by 1.6%, 11.05%, and 6.62% for the bending radii of 120 mm, 80 mm, and 40 mm, respectively. Moreover, transmission efficiency varies by 4.3% for the bending radius of 120 mm. Decreasing the bending radius has more effects on antenna transmission efficiency that may cause severe losses in the communication link.

scholarly journals METHOD OF DETECTING FALSE INTENTIONALLY GENERATED ADS-B SIGNALS

T-Comm ◽  
2020 ◽  
Vol 14 (11) ◽  
pp. 4-13
Author(s):  
Andrey S. Kalintsev ◽  
◽  
Evgeny A. Rubtsov ◽  
◽  
Keyword(s):  
Traffic Management ◽  
Low Cost ◽  
Real Data ◽  
Antenna System ◽  
Civil Aviation ◽  
Surveillance Systems ◽  
Data Link ◽  
Ground Station ◽  
Ground Source ◽  
Aircraft Trajectory

The International Civil Aviation Organization recommends to use advanced surveillance systems: multi-sensor surveillance system and automatic dependent surveillance broadcast. Ground stations for automatic dependent surveillance have a relatively low cost and can partially replace secondary surveillance radars in the future. Currently, the development of automatic dependent surveillance has slowed down, because the system has vulnerabilities: the complete openness of the 1090ES data link, the lack of encryption and protection against false intentionally generated signals. There are a large number of equipment on the market for receiving and processing on-board transponder signals; for specialists it's not difficult to assemble transmitting equipment that generates such signals. This poses a serious threat to information security and flight safety. The article proposes a method that allows, through a comprehensive analysis of the aircraft trajectory and the nature of the level of received signals, identify false signals generated intentionally. The proposed technique is based on identification of abnormal characteristics of false signals. To search and identify anomalous characteristics, the Mahalanobis distance is estimated. To increase the distinguishability of data and to detect intentional interference, it is necessary to modernize the antenna system of the ground station by introducing an additional antenna with a different radiation pattern. The false signal generated by the ground source is detected by a constant value of the antenna directivity ratio. The developed technique was implemented in the MATLAB software and applied to evaluate real data received from the ground-based automatic dependent surveillance station located in the Arkhangelsk air traffic management center. The power levels of the received messages of automatic dependent observation received from L-410 aircraft operating in the area of local air lines were used as reference values.

Data link communications: Perspectives from the air and ground

2003 ◽  
Author(s):  
Carryl L. Baldwin ◽  
Immanuel Barshi ◽  
Danielle S. McNamara ◽  
Anthony D. Andre ◽  
Daniel Morrow ◽  
...  
Keyword(s):  
Data Link

Emerging Data Link Psoriasis to Comorbidities

2008 ◽  
Vol 38 (17) ◽  
pp. 27
Author(s):  
DOUG BRUNK
Keyword(s):  
Data Link
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