• Journal of Advanced Navigation Technology
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• v.13 no.5
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• pp.630-638
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• 2009

In this paper, we propose a new SCADE-based integrated simulator for aircraft mid-air collision avoidance. The new simulator is designed to provide a convenient simulation environment for analyzing the limitations of the existing collision avoidance system(CAS) and for realizing more realistic collision environment into the CAS performance evaluation. Furthermore, we have developed a scenario editor for TCAS-II performance analysis to simulate actual flight environment which is difficult to experiment. The performance of the proposed simulator for typical collision scenarios is demonstrated by simulation using the proposed scenario editor.

• The Journal of the Korea institute of electronic communication sciences
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• v.16 no.5
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• pp.969-974
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• 2021

South Korea is making efforts to select a drone industry, a type of unmanned aerial vehicle, as one of the 7 major industries in the country, to select a drone-specific liberalization zone and to establish and revise a drone-related bill. Through these efforts, drone delivery and drone taxis are expected to be operated in the future. Therefore, a multilateral collision avoidance system with existing aircraft such as drones, fixed-wing and rotary-wing should be established to prepare for possible drone and air-borne collisions.

• Journal of Advanced Navigation Technology
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• v.18 no.1
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• pp.1-6
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• 2014

Though the functions and operational procedures of current ACAS-II are upgraded several times owing to technical advancement, so far the mid-air collision accidents never come to an end. Recently to solve the major issues of ACAS-II, ICAO began to develop a future ACAS (Airborne Collision Avoidance System) by the year 2015. Accordingly in order to prepare for international standardization of the future ACAS, in this paper a policy is proposed for domestic implementation of the future ACAS based on the results from studying the technical standards and future development trends of ACAS.

• Journal of the Korean Society for Aviation and Aeronautics
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• v.16 no.4
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• pp.49-53
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• 2008

비행 편수의 증가 추세는 관제 밀집도를 높여 항공관제 사와 조종사간 communication 실수를 유발할 수 있는데 특히 호출 부호(Call Sign)의 혼동, 착각에 의한 경우가 많은 것으로 나타나고 있다. 항공 관제사와 조종사간의 communication 실수는 항공기 고도 위반, 활주로 침범, CFIT, 공중 충돌, Near Miss로 인한 위험 상황을 초래할 수 있다. 본 연구는 민간 항공사에 근무하는 조종사들의 유사 콜사인에 대한 혼동 정도와 위험성 인식을 설문 조사하였으며 이를 분석하여 방지 대책을 모색하였다. 국내 조종사와 외국인 조종사의 혼동 정도와 위험성 인식의 차이는 나타나지 않았으며 공항이 위치한 국가에 따라 혼동 정도의 차이가 있었다. 동일 항공사에서 나타나는 유사 콜사인은 자체 해결 가능하였지만 타 항공사와의 유사 콜사인을 해결하는 데는 한계가 있어 관계 기관의 적극적인 중재가 요구된다.

• Defense and Technology
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• no.5 s.207
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• pp.14-25
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• 1996

한국에서 궁극적으로 큰 안보위험이 될 수 있는 중국이 최근의 군비증강을 통해 공중 및 해상방위 능력을 강화하고 있다는 점은 매우 시사적이다. 한국은 중국의 군사력 증강과 수반되어 나타나고 있는 외부 세력과의 직접적인 군사력 충돌에 대비한 적절한 조치를 강구하여야 할 것이며, 이와 함께 이러한 충돌의 가능성을 사전에 줄여나가는 것도 매우 중요하다.

• Journal of the Korea Institute of Military Science and Technology
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• v.12 no.2
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• pp.213-221
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• 2009

An aircraft collision accident is a disaster that causes great losses of inventories and lives. Though a collision avoidance warning function is provided automatically to pilots in the aircrafts by the enhancement of the aircraft capability, achieving fast decision-making to escape a collision situation is a complex and dangerous work for pilots. If an in-flight collision situation is controlled by the air traffic control system which monitors all airplanes in the air, it would be more efficient to prevent in-flight collisions because it can handle the emergency before the pilot's action. In this paper, we develop the collision avoidance warning function in the air traffic control system. Specifically, we design and implement the five stages of the collision avoidance function, and propose a visualization method which could effectively provide the operators with the trajectories and altitudes of the aircrafts in a collision situation. By developing an in-flight collision warning function in the air traffic control system that visualizes flight patterns through the state transition data of in-flight aircrafts on the flight path lines, it can effectively prevent in-flight collisions with traffic alerts. The developed function allows operators to effectively select and control the aircraft in a collision situation by providing the operators with the expected collision time, the relative distance, and the relative altitude while assessing the level of alert, and visualizing the alert information which includes the Attention-Warning-Alert phase via embodying the TCAS standard. With the developed function the air traffic control system could sense an in-flight collision situation before the pilot's decision-making moment.

• Journal of Advanced Navigation Technology
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• v.15 no.6
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• pp.986-993
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• 2011

In this paper we consider the problem of the existing TCAS-II systems that fail to be satisfactory solution to mid-air collisions (MACs) and near mid-air collisions (NMACs or near misses). This is attributed to the fact that the earlier studies on the collision avoidance mainly have focused on determination logic of avoidance direction and vertical speed, reversal of the avoidance direction, multiple aircraft geometry, and availability in certain air spaces. But, the influence of sensor measurement errors on the performance of collision avoidance was not properly taken into account. Here we propose a new TCAS algorithm by using Kalman filter instead of '${\alpha}-{\beta}$' tracker to improve the avoidance performance under the influence of barometric sensor errors due to air-temperature, pressure leaks, static source error correction, etc.

• Journal of the Korean Society for Aviation and Aeronautics
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• v.18 no.3
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• pp.27-33
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• 2010

The goal for the CD&R system is to predict that a conflict is going to occur in the future, communicate the detected conflict to a human operator, and, in some cases, assist in the resolution of the conflict situation. To provide insight into different methods of conflict detection and resolution, a literature review of previous research models and current developmental and operational systems was performed. This paper focuses only on the specific attributes of each model, not on the depth to which a model has been analyzed, validated, or accepted. Thus, care should be taken to remember that a model that seems to be simple according to our categorization scheme may be significantly more viable than an apparently sophisticated model.

• Proceedings of the Korea Information Processing Society Conference
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• 2017.11a
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• pp.121-123
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• 2017

드론은 군사목적에서 개발되고 사용되어 왔으나 현재에는 촬영, 물류 등의 다양한 분야에서 연구 및 사용되고 있다. 앞으로 수많은 드론이 하늘에서 비행할 것으로 예상됨에 따라 때때로 비슷한 항로를 비행하는 드론간의 충돌 위험 또한 야기될 수 있다. 드론을 안전하게 비행하기 위한 많은 연구들이 진해되어 왔지만 공중 충돌에 의한 피해를 최소화 하려는 연구의 진행은 초기상태에 있다. 본 논문은 민간 항공기에 적용되어 사용되고 있는 1030/1090MHz 대역의 TCAS 시스템을 433MHz LoRa 네트워크를 사용하여 구현하였다. 충돌 위험을 판단하는 근거는 비행준인 드론의 진행 방향 및 비행 고도를 통하여 산출한다.

• Journal of Advanced Navigation Technology
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• v.27 no.5
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• pp.552-560
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• 2023

Aircraft midair collisions are dangerous events that can cause massive casualties. To prevent this, civil aviation has mandated the installation of TCAS (ACAS), which is becoming more sophisticated with the help of new technologies. However, there are institutional problems in collecting data for TCAS research in Korea, limiting the ability to obtain data for personal research. ADS-B and Mode-S automatic broadcast various information about the flight status of the aircraft. This data also contains information about TCAS RA, which can be used by anyone to find examples of TCAS RA operation. We used the databases of ADS-B Exchange and Opensky-Network to acquire data and visually represent three TCAS RA cases through Python coding. We also identified domestic TCAS cases in the first half of 2023 and analyzed their characteristics to confirm the usefulness of the data.