Receiving System Design of ILS Navigation Signal Using SDR
김민성 Minsung Kim , 강지혜 Ji-hye Kang , 구경헌 Kyung Heon Koo , 이경순 Kyung-soon Lee
28(3) 254-261, 2024
김민성 Minsung Kim , 강지혜 Ji-hye Kang , 구경헌 Kyung Heon Koo , 이경순 Kyung-soon Lee
DOI: JANT Vol.28(No.3) 254-261, 2024
Accurate guidance during landing and take-off is important, and instrument landing system (ILS) has been used for stability and verification. Regular inspections are conducted for stable operation, and there is research to perform inspection using drones in addition to ground vehicles and measurement aircraft. Using SDR and single board computer, which can receive wide frequency range, we designed a small system that receives and processes localizer signals through GNU Radio. To check signal processing characteristics through GNU Radio, we simulated with MATLAB Simulink and confirmed the theoretical values. Difference in depth of modulation (DDM) and approach angle can be calculated when the aircraft enters the runway. And GNU Radio implemented real-time signal processing wirelessly using transmission control protocol (TCP). This gives the results within the error of 0.5% when the aircraft entered the runway center line and 0.27% for the angle of 1o degree. Compared to the inspecting and maintaining ILS signals using aircraft or ground vehicles, it is possible to implement a receiving system using small SDR that can be mounted for drone.
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Improving Orbit Determination Precision of Satellite Optical Observation Data Using Deep Learning
윤현만 Hyeon-man Yun , 김찬호 Chan-ho Kim , 최인수 In-soo Choi , 이성섭 Soung-sub Lee
28(3) 262-271, 2024
윤현만 Hyeon-man Yun , 김찬호 Chan-ho Kim , 최인수 In-soo Choi , 이성섭 Soung-sub Lee
DOI: JANT Vol.28(No.3) 262-271, 2024
In this paper, by applying deep learning, one of the A.I. techniques, through angle information, which is optical observation data generated when observing satellites at observatories, distance information from observatories is learned to predict range data, thereby increasing the precision of satellite's orbit determination. To this end, we generated observational data from GMAT, reduced the learning data error of deep learning through preprocessing of the generated observational data, and conducted deep learning through MATLAB. Based on the predicted distance information from learning, trajectory determination was performed using an extended Kalman filter, one of the filtering techniques for trajectory determination, through GMAT. The reliability of the model was verified by comparing and analyzing the orbital determination with angular information without distance information and the orbital determination result with predicted distance information from the model.
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Comparative Analysis of Circling Approach Procedure Design Standards Applied to Domestic Airports
장동관 Dong-kwan Jang
28(3) 272-277, 2024
장동관 Dong-kwan Jang
DOI: JANT Vol.28(No.3) 272-277, 2024
In most countries, instrument flight procedures are designed by applying one of the following standards: the International Aviation Organization's DOC 8168, Air Navigation Services and Operation Procedures (PANS-OPS), or the US Federal Aviation Administration’s TERPS, Terminal Procedures. In particular, the circling approach procedure has many differences between the two standards, and the US terminal procedure (TERPS) has become more complicated since 2013 by applying expanded standards depending on altitude. The circling approach procedures are more risky than straight-in approach procedures because it involves maneuvering the aircraft close to the ground at low energy for landing. In order to accurately understand these differences, this study provides to distinguish by what criteria the circling approach procedure is designed according to individual domestic airports in Korea, to calculate the radius for the range of circling approach areas that guarantee minimum obstacle avoidance during circling approach maneuvers, and to present methods for performing safe circling approach procedures.
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Development of Link Budget Model and Simulator for Telemetry System of Small Launch Vehicle
오택근 Taeckkeun Oh , 이유상 You-sang Lee , 이대현 Dae-hyun Lee , 이온수 Onsoo Lee
28(3) 278-287, 2024
오택근 Taeckkeun Oh , 이유상 You-sang Lee , 이대현 Dae-hyun Lee , 이온수 Onsoo Lee
DOI: JANT Vol.28(No.3) 278-287, 2024
In this paper, telemetry link budget model for small launch vehicle is proposed, and telemetry link budget simulator is implemented. The proposed link budget model consist of geometry model and propagation loss model. The geometry model is calculation of look angle between ground station and small launch vehicle. The propagation loss model consist of free space loss, polarization loss, and de-pointing loss which are appropriate to the small launch vehicle flight environment. The proposed propagation loss model can be calculate propagation loss without complex calculation of propagation environments. The link budget simulator is implemented in MATLAB. The simulator calculate look angle, free space loss, polarization loss parameter, de-pointing loss and received signal level in ground station by using position of ground station, routing of small launch vehicle, 3-D radiation patterns of antennas.
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A Study on the Construction of Sustainable Connected Transportation in Kepulauan Riau, Indonesia Using Advanced Air Mobility (AAM)
프라스티우토모-푸구 Prastyoutomo Puguh , 이광병 Kwang-byeng Lee
28(3) 288-299, 2024
프라스티우토모-푸구 Prastyoutomo Puguh , 이광병 Kwang-byeng Lee
DOI: JANT Vol.28(No.3) 288-299, 2024
Indonesia's Keplauan Liau region is facing limitations in the development of connected transportation infrastructure due to its archipelago nature, budget constraints, and lack of land. Transportation demand is increasing due to its strategic location in the Malacca Strait Business Triangle and many tourist visits from Singapore and Malaysia. However, due to the nature of connecting many islands, the establishment of transportation infrastructure has not been achieved. This paper aims to predict the innovations that can be brought about by the introduction of advanced air mobility (AAM) with an electric vertical take-off and landing (e-VTOL) system through analysis and application consideration of the actual situation in Indonesia's Kepulauan Liau region. In addition, it intends to contribute to national-level review and policy establishment on the establishment of innovative transportation infrastructure using AAM, reflection in infrastructure construction plans, and active global cooperation.
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Object Detection Capabilities and Performance Evaluation of 3D LiDAR Systems in Urban Air Mobility Environments
구본수 Bon-soo Koo , 최인호 In-ho Choi , 황재욱 Jaewook Hwang
28(3) 300-308, 2024
구본수 Bon-soo Koo , 최인호 In-ho Choi , 황재욱 Jaewook Hwang
DOI: JANT Vol.28(No.3) 300-308, 2024
Urban air mobility (UAM) is emerging as a revolutionary transportation solution to urban congestion and environmental issues. Especially, electric vertical take-off and landing (eVTOL) aircraft are expected to enhance urban mobility, reduce traffic congestion, and decrease environmental pollution. However, the successful implementation and operation of UAM systems heavily rely on advanced technological infrastructure, particularly in sensor technology. Among these, 3D light detection and ranging (LiDAR) systems are essential for detecting obstacles and generating pathways in complex urban environments. This paper focuses on the challenges of developing LiDAR-based perception solutions, emphasizing the importance and performance of object detection capabilities using 3D LiDAR. It integrates LiDAR data processing algorithms and object detection methodologies to experimentally validate the effectiveness of perception solutions that contribute to the safe navigation of aircraft. This research significantly enhances the ability of aircraft to recognize and avoid obstacles effectively within urban settings.
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Design of Electret Microphone Interfacing Circuit for Microphone Signal Path Control between Intercoms
조성희 Sung-hee Cho , 정성재 Seong-jae Jeong , 김민선 Min-seon Kim , 남덕우 Deok-woo Nam , 정다나 Da-na Jung , 김준형 Jun-hyoung Kim
28(3) 309-314, 2024
조성희 Sung-hee Cho , 정성재 Seong-jae Jeong , 김민선 Min-seon Kim , 남덕우 Deok-woo Nam , 정다나 Da-na Jung , 김준형 Jun-hyoung Kim
DOI: JANT Vol.28(No.3) 309-314, 2024
Avionics Intercom performs communication between pilot, co-pilot and crews in aircraft. In the case of developing intercom in the aircraft modification development project, additional communication equipment or avionics equipment is configured to link the existing intercom with the headsets. Newly designed intercom needs a configuration that receives an aircraft headset microphone and transmits a microphone signal to the existing intercom, and these signals are required to perform signal quality above a certain level. To satisfy these requirements, microphone transmitter circuit has designed and tested, but quality factors of signal were not suitable. In order to avoid the issue, eliminate transmitter and apply signal bridge circuit considered with load effect, and it meets requirements. In this paper, the test results for the signal quality for each configuration are reviewed.
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Design of uC/OS-II Based Telemetry PCM Encoder for Effective Resource Use
김건희 Geon-hee Kim , 김복기 Bokki Kim
28(3) 315-322, 2024
김건희 Geon-hee Kim , 김복기 Bokki Kim
DOI: JANT Vol.28(No.3) 315-322, 2024
In this paper, we proposes real-time operating system based PCM encoder for telemetry system that must transmit frames within a set time. In the case of large aircraft, the complexity of the system is increasing because a lot of state information is measured from each sensor and peripheral device. In addition, as the amount measurement data increases, the role of PCM encoder to transmit frames within a set time is becoming important. Existing encoder is inflexible when changing specifications or implementing additional features. Therefore, a design is needed to supplement this. We propose a PCM encoder design applying uC/OS-II. In order to confirm the validity, a simulation was performed to measure the execution time of the task to confirm the performance.
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Effect of Airline Pilots' Self-esteem on Safety Culture and Safety Behavior through Job Satisfaction
양승필 Seung Pil Yang , 고강민 Kangmin Ko
28(3) 323-330, 2024
양승필 Seung Pil Yang , 고강민 Kangmin Ko
DOI: JANT Vol.28(No.3) 323-330, 2024
The purpose of this study is to analyze the effect of self-esteem on the safety culture and safety behavior of airline pilots and to confirm whether job satisfaction has a mediating effect in these relationships. It was examined whether self-esteem directly affects safety culture and safety behavior, and indirectly through job satisfaction. As a result of the study, self-esteem did not have a direct significant effect on safety culture, but indirectly had a positive effect through job satisfaction. In addition, self-esteem had a direct significant positive effect on safety behavior, and job satisfaction partially mediated this relationship. This suggests that pilots with higher self-esteem practice safety behavior more actively, and job satisfaction can promote such behavior. These results show the importance of organizational support such as programs and support for enhancing pilots' self-esteem, fair compensation for improving job satisfaction, improving working environment, and providing career development opportunities in airlines, and are intended to be used as basic data for this.
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Development of Performance Evaluation Method for Mission Autonomy Software based on UxAS
한동건 Dong-geon Han , 김윤근 Yun-geun Kim
28(3) 331-337, 2024
한동건 Dong-geon Han , 김윤근 Yun-geun Kim
DOI: JANT Vol.28(No.3) 331-337, 2024
Mission autonomy system should be embedded on UAV (unmanned aerial vehicle) for mosaic warfare where UAVs autonomously assign tasks to themselves. UxAS (unmanned x-systems autonomy service) proposed by Air force research laboratory is mission autonomy system for unmanned platforms. UxAS has extensible structure composed of numerous module services. We have developed mission autonomy system based on UxAS that performs mission allocation and path planning. In this paper, We present a method of analyzing and evaluating the mission autonomy software according to the performance evaluation index.
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