Analysis of Weather Conditions from Hourly to Seasonal Scales for Pilot Aviation Training Organization(ATO): Case study for Muan International Airport
손병욱 Byoung Wook Son , 김현미 Hyeonmi Kim , 김휘양 Hui Yang Kim
26(5) 249-260, 2022
손병욱 Byoung Wook Son , 김현미 Hyeonmi Kim , 김휘양 Hui Yang Kim
DOI: JANT Vol.26(No.5) 249-260, 2022
Student pilots receiving flight education are inexperienced in piloting and situation judgment skills and are greatly affected by various factors such as psychological, physical, and environmental factors. In particular, one of the most influential factors in the flight education of student pilots is the weather conditions. Unlike large aircraft used in the air transportation business, small aircraft used for flight education have a great impact on education, such as flight restrictions depending on weather conditions, psychological pressure in severe weather, and deterioration of student skills. Therefore, in this study, the meteorological characteristics of meteorological factors that have a great influence on small aircraft were analyzed. As a result of the analysis, an efficient and safe training operation method was suggested to a professional pilot aviation training organization through the adjustment of the training period for the season, the increase in aircraft operation rate, and a safe solo flight plan considering the weather.
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A Study on the Frequency Analysis of Available Channels in TVWS around the West Sea of Korea (Incheon-Jejudo)
정찬형 Chanhyung Chung , 차재상 Jaesang Cha , 심동하 Dongha Shim
26(5) 261-271, 2022
정찬형 Chanhyung Chung , 차재상 Jaesang Cha , 심동하 Dongha Shim
DOI: JANT Vol.26(No.5) 261-271, 2022
This paper is the study in Korea to secure new frequency resources available at sea among terrestrial DTV (Digital TV) broadcasting bands. Focusing on Incheon and Jejudo in the west Sea of Korea, the possibility of using TVWS frequencies of DTV broadcast signals (channels 14-51, 470~698 MHz) was studied. According to the analysis, three channels, channel 19 (503 MHz), channel 37 (611 MHz) and channel 39 (623 MHz) can be used as TVWS available channels without interference with DTV in all nearby seas such as Incheon Port and Jeju Port. On the other hand, two channels, Channel 23 (527 MHz) and Channel 33 (587 MHz), were divided into strong DTV signals in the section between Incheon Port and Jeju Port, making it difficult to use them as available frequencies for TVWS on the west coast.
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A Study on the air traffic control system of Korea Light Aircraft Carrier
최연철 Youn-chul Choi , 정용태 Yong-tae Jung , 조영진 Young-jin Cho
26(5) 272-280, 2022
최연철 Youn-chul Choi , 정용태 Yong-tae Jung , 조영진 Young-jin Cho
DOI: JANT Vol.26(No.5) 272-280, 2022
An aircraft carrier is a combat ship that acts as an aircraft base at sea and performs combat through aircraft mounted as a military ship operating the aircraft. The Navy proposed a 40,000-ton light aircraft carrier operation plan that could be equipped with vertical takeoff and landing fighter jets and helicopters around 2033, and based on this, this study examined the operation of aircraft control equipment among the aviation support systems required for operating light aircraft carriers in Korea. PriFly, TWR's ILARTS, ILM for airspace control, ASR, PAR, LAAS or RNAV, PALS (JPALS) for access control are required as essential equipment, and communication network and SCATT-16 are required along with URN-25 TACAN, ICLS (El/Az), ACLS OLS, MOVAS, IFLOLS, etc. This study consists of two parts, and part 2 will describe a specific control method on an aircraft carrier.
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Analysis of Human Casualties on the Ground in Urban Area due to UAM Crash
김연실 Youn-sil Kim , 최인호 In-ho Choi
26(5) 281-288, 2022
김연실 Youn-sil Kim , 최인호 In-ho Choi
DOI: JANT Vol.26(No.5) 281-288, 2022
This study quantitatively analyzed the human casualties that can occur when a multicopter-type Urban Air Mobility (UAM) with a weight of about 1 ton and a speed of about 100 km/h falls in an urban area. Based on the population density and building database in Seoul, the population exposed to collisions in the event of a UAM crash was derived. Through the ballistic descent model, the accident impact radius of the UAM fall was calculated. In addition, the change in human casualties on the ground was analyzed when the accident impact radius increased. Finally, the ground risk map was created for Seoul, and it was confirmed that about 1 to 10 people could be injured when a UAM crash.
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Impact of Fourth Industrial Revolution on Airport Management System: Moderator Effect of Convergence and Leadership
이영길 Yung-kil Lee , 백정선 Jeong-sun Baek , 박성식 Sung-sik Park
26(5) 289-303, 2022
이영길 Yung-kil Lee , 백정선 Jeong-sun Baek , 박성식 Sung-sik Park
DOI: JANT Vol.26(No.5) 289-303, 2022
The purpose of this study verify to influence the effect of the 4th industrial revolution recognized by airport operators on the airport management system and the moderator effects of convergence and leadership between these influence relationships. Data collected through a survey of airport operators using simple random sampling at six international airports in Korea. Data analysis performed using Structural Equation Modeling. The research results found that the 4th industrial revolution had a positive effect on the airport management system. Also, moderator effects of convergence and leadership found significant statistically. In this paper, we asserts that it should be reconstructed the airport management system as a system suitable for the era of the 4th industrial revolution. This paper provide theoretical data and directions for empirical research to airport researchers, and implications for airport enterprise managers and airport policy planners. The findings of this study are particularly helpful for international airports that have adopted the technologies of the Fourth Industrial Revolution.
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A Study on the Techniques of Path Planning and Measure of Effectiveness for the SEAD Mission of an UAV
우지원 Ji Won Woo , 박상윤 Sang Yun Park , 남경래 Gyeong Rae Nam , 고정환 Jeong Hwan Go , 김재경 Jae Kyung Kim
26(5) 304-311, 2022
우지원 Ji Won Woo , 박상윤 Sang Yun Park , 남경래 Gyeong Rae Nam , 고정환 Jeong Hwan Go , 김재경 Jae Kyung Kim
DOI: JANT Vol.26(No.5) 304-311, 2022
Although the SEAD(suppression to enemy air defenses) mission is a strategically important task in modern warfare, the high risk of direct exposure to enemy air defense assets forces to use of unmanned aerial vehicles. this paper proposes a path planning algorithm for SEAD mission for an unmanned aerial vehicle and a method for calculating the mission effectiveness on the planned path. Based on the RRT-based path planning algorithm, a low-altitude ingress/egress flight path that can consider the enemy's short-range air defense threat was generated. The Dubins path-based Intercept path planning technique was used to generate a path that is the shortest path while avoiding the enemy's short-range anti-aircraft threat as much as possible. The ingress/intercept/egress paths were connected in order. In addition, mission effectiveness consisting of fuel consumption, the survival probability, the time required to perform the mission, and the target destruction probability was calculated based on the generated path. The proposed techniques were verified through a scenario.
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Development of Autonomous Behavior Software based on BDI Architecture for UAV Autonomous Mission
양승구 Seung-gu Yang , 엄태원 Taewon Uhm , 김경태 Gyeong-tae Kim
26(5) 312-318, 2022
양승구 Seung-gu Yang , 엄태원 Taewon Uhm , 김경태 Gyeong-tae Kim
DOI: JANT Vol.26(No.5) 312-318, 2022
Currently, the Republic of Korea is facing the problem of a decrease in military service resources due to the demographic cliff, and is pursuing military restructuring and changes in the military force structure in order to respond to this. In this situation, the Army is pushing forward the deployment of a drone-bot combat system that will lead the future battlefield. The battlefield of the future will be changed into an integrated battlefield concept that combines command and control, surveillance and reconnaissance, and precision strike. According to these changes, unmanned combat system, including dronebots, will be widely applied to combat situations that are high risk and difficult for humans to perform in actual combat. In this paper, as one of the countermeasures to these changes, autonomous behavior software with a BDI architecture-based decision-making system was developed. The autonomous behavior software applied a framework structure to improve applicability to multiple models. Its function was verified in a PC-based environment by assuming that the target UAV is a battalion-level surveillance and reconnaissance UAV.
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Position Estimation Technique of High Speed Vehicle Using TLM Timing Synchronization Signal
진미현 Mi-hyun Jin , 구떠올라 Ddeo-ol-ra Koo , 김복기 Bok-ki Kim
26(5) 319-324, 2022
진미현 Mi-hyun Jin , 구떠올라 Ddeo-ol-ra Koo , 김복기 Bok-ki Kim
DOI: JANT Vol.26(No.5) 319-324, 2022
If radio interference occurs or there is no navigation device, radio navigation of high-speed moving object becomes impossible. Nevertheless, if there are multiple ground stations and precise range measurement between the high-speed moving object and the ground station can be secured, it is possible to estimate the position of moving object. This paper proposes a position estimation method using high-precision TDOA measurement generated using TLM signal. In the proposed method, a common error of moving object is removed using the TDOA measurements. The measurements is generated based on TLM signal including SOQPSK PN symbol capable of precise timing synchronization. Therefore, since precise timing synchronization of the system has been performed, the timing error between ground stations has a very small value. This improved the position estimation performance by increasing the accuracy of the measured values. The proposed method is verified through software-based simulation, and the performance of estimated position satisfies the target performance.
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A Study on a Information Fusion Architecture of Avionics Realtime Track and Tactical Data Link
강신우 Shin-woo Kang , 이영서 Young Seo Lee , 박상웅 Sang-woong Park , 안태식 Tae-sik Ahn
26(5) 325-330, 2022
강신우 Shin-woo Kang , 이영서 Young Seo Lee , 박상웅 Sang-woong Park , 안태식 Tae-sik Ahn
DOI: JANT Vol.26(No.5) 325-330, 2022
The sensors of aircraft are necessity for mission performance and fusion process of data from them is applied for increase of mission efficiency and decrease of aircraft pilot workload. Data fusion is applied and developed to provide pilot a series of more processed data format about a specific target from sensors in aircraft. Military aircraft currently in operation are linked with a tactical data link such as Link-16 to display improved tactical situation to pilots to increase mission efficiency. By fusing the sensor data with improved accuracy obtained as the sensors’ performance mounted on the aircraft become higher and the tactical situation information received through the tactical data link, it provides the pilot with a highly reliable tactical situation and mission environment, and expects efficient mission performance and high survivability. In this paper, a fusion architecture to produce fused data with realtime information from the sensors and data through a tactical data link is shown.
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Mid-span Spectral Inversion System Applied with Dispersion Management with Different RDPS Determinations for Half Transmission Link
이성렬 Seong-real Lee
26(5) 331-337, 2022
이성렬 Seong-real Lee
DOI: JANT Vol.26(No.5) 331-337, 2022
The length of optical fiber in dispersion-managed link combined with optical phase conjugation to compensate for signal distortion caused by chromatic dispersion and nonlinear Kerr effect is a major factor determining the compensation effectiveness. The dispersion-managed link consists of several fiber spans in which standard single mode fiber and dispersion compensating fiber are arranged. In this paper, the compensation effect in the link that changes residual dispersion per span only by adjusting the length of one type of optical fiber, which is different in the first half link and the second half link with respect to optical phase conjugator (OPC), has been investigated. It was confirmed that the best compensation for 960 Gb/s wavelength division multiplexed signal could be obtained in the dispersion-managed link, in which the cumulative dispersion profile is symmetric around the OPC, and the cumulative dispersion amount is all positive in the first half, and all the cumulative dispersion amount is distributed negatively in the second half.
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Interference Analysis of ATC System by Lawn Mower
이두현 Doo-hyun Lee , 강영흥 Young-heung Kang
26(5) 338-343, 2022
이두현 Doo-hyun Lee , 강영흥 Young-heung Kang
DOI: JANT Vol.26(No.5) 338-343, 2022
The Air Radio Station plays a role in creating skyways for aircraft and helping them fly safely through aviation mobile communication facilities (U/VHF transceivers) and various navigation safety facilities. It is necessary to remove large trees and weeds around the aircraft because accurate and safe signals must be provided without interruption. During the mowing work for the efficient management of landscaping facilities, there have been cases in which noise is introduced by Lawn Mower, which hinders control work. Accordingly, in order to analyze how mower affects air mobile communication facilities, the interference effect on air mobile communication facilities was analyzed for four types of mower, two-stroke, and battery type. As a result of the analysis, it was found that the two-stroke mower greatly affects air mobile communication facilities.
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Compact UWB Log Periodic Right Triangle-Shaped Dipole Array Antenna Appended With Strips
여준호 Junho Yeo , 이종익 Jong-ig Lee
26(5) 344-349, 2022
여준호 Junho Yeo , 이종익 Jong-ig Lee
DOI: JANT Vol.26(No.5) 344-349, 2022
A compact LPDA antenna consisting of right triangle-shaped dipole elements appended with strips is proposed for UWB applications. First, right triangle-shaped dipole elements are used instead of conventional strip dipole elements to reduce the width of the LPDA antenna. Second, the spacing between the LPDA elements is decreased to reduce the length of the LPDA antenna. Finally, strips are appended at the ends of the right triangle-shaped dipole elements in order to further reduce the width of the antenna. A prototype of the proposed antenna with 16 elements and gain > 4 dBi is fabricated on an FR4 substrate with dimensions of 44 mm×30 mm. Measured frequency band of the fabricated antenna is 2.99-14.76 GHz for a VSWR < 2, which ensures UWB operation, and measured gain range is 4.0-5.5 dBi with a front-to-back ratio larger than 10 dB. The length and width of the proposed compact LPDA antenna are reduced by 40.9% and 20.6%, respectively, compared to the conventional LPDA.
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Analysis of Interferences into a Space Weather Observation Receiver in 2.8GHz Band
강영흥 Young-heung Kang
26(5) 350-357, 2022
강영흥 Young-heung Kang
DOI: JANT Vol.26(No.5) 350-357, 2022
With the recent prediction of 'Cycle 25', the importance of space weather research increases. Accordingly, the World Radiocommunication Conference (WRC)-23 has adopted Agenda Item 9.1a) and carried out sharing researches between active/passive space weather observation systems and existing services. Therefore, in this paper, in order to increase the precision of space weather environment data and secure the frequency spectrum for observation systems, the direct interference effect from the weather radar in Gosan, Jeju on the space weather observation receiver in Hallim, Jeju, and the indirect interference on the observation receiver by diffraction and scattering from the radar target have been analyzed. As a result, it can be known that the radar direction, the propagation direction diffracted and scattered from the target, and the Rradar Cross Section (RCS) of the radar target, the reception area of the space weather observation antenna, and the antenna off-boresight are important parameters for the interference effect analysis.
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The Digital Redundancy Design for Back-up Mode Operation of Aviation Intercom
정성재 Seong-jae Jeong , 조경학 Kyung-hak Cho , 김동혁 Dong-hyouk Kim , 이성우 Seong-woo Lee
26(5) 358-364, 2022
정성재 Seong-jae Jeong , 조경학 Kyung-hak Cho , 김동혁 Dong-hyouk Kim , 이성우 Seong-woo Lee
DOI: JANT Vol.26(No.5) 358-364, 2022
The Inter Communication System for avionics is in charge of processing all voice signals that internal calls between Pilot and Co-pilot, internal calls between Pilots and Crews, external calls through communication equipment such as Ultra/Very High Frequency Receiver/Transmitter(U/VHF RT), audio signal monitoring for navigation and mission equipment such as VHF Omnidirectional Range/Instrument Landing System(VOR/ILS), Tactical Air Navigation(TACAN), audio signal output for voice recording to Flight Data Recorder(FDR) and Data Transfer System(DTS), and warning/caution audio signal generate about the status and threat of aircraft. Because Inter Communication System for avionics is sensitive to noise in the case of analog audio signals, a redundant design that can protect audio signal from electromagnetic noise inside/outside of aircraft is required for the mission of pilots and crews. In this paper, Normal/Back-up operation mode and redundancy design plan based on digital method for the redundancy of the digital Inter Communication System for avionics and manufacturing, verification results are described.
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Design and Implementation of BNN-based Gait Pattern Analysis System Using IMU Sensor
나진호 Jinho Na , 지기산 Gisan Ji , 정윤호 Yunho Jung
26(5) 365-372, 2022
나진호 Jinho Na , 지기산 Gisan Ji , 정윤호 Yunho Jung
DOI: JANT Vol.26(No.5) 365-372, 2022
Compared to sensors mainly used in human activity recognition (HAR) systems, inertial measurement unit (IMU) sensors are small and light, so can achieve lightweight system at low cost. Therefore, in this paper, we propose a binary neural network (BNN) based gait pattern analysis system using IMU sensor, and present the design and implementation results of an FPGA-based accelerator for computational acceleration. Six signals for gait are measured through IMU sensor, and a spectrogram is extracted using a short-time Fourier transform. In order to have a lightweight system with high accuracy, a BNN-based structure was used for gait pattern classification. It is designed as a hardware accelerator structure using FPGA for computation acceleration of binary neural network. The proposed gait pattern analysis system was implemented using 24,158 logics, 14,669 registers, and 13.687 KB of block memory, and it was confirmed that the operation was completed within 1.5 ms at the maximum operating frequency of 62.35 MHz and real-time operation was possible.
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