• Title, Summary, Keyword: Aircraft Delay

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Time Delay Error Analysis and Compensation Method of Integrated Navigation System for Aircraft Store (항공장착물의 전달정렬을 위한 통합항법장치 시간 지연 오차 분석 및 보상 기법)

  • Seo, Byung-Il
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.46 no.7
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    • pp.592-601
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    • 2018
  • The GPS/INS integrated navigation system, which is one of the electronic equipments mounted on military aircraft store, can not directly receive GPS signals by the aircraft wing before the drop, so GPS navigation data is received from the aircraft and used for filter integration, afterwards, the integrated navigation is performed using the GPS information directly received through the antenna. In this case, it is possible to operate the mount in old aircraft without any modification of the aircraft when GPS data is transmitted using wireless. However, the delay occurs while the aircraft navigation data is transmitted to the integrated navigation filter of the aircraft store via wireless, which affects the time synchronization of the GPS measurement and the INS information, affecting the integrated navigation performance. In this paper, an algorithm to analyze and compensate the effect of generation and transmission delay that can occur when implementing GPS/INS integrated navigation system of aircraft store that receives GPS data via wireless.

Enhancement of Geo-pointing Performance for Electro-Optical Systems by Compensating Transmission Time Delay of Navigation Data (항법정보 전송지연 보상을 통한 전자광학장비 좌표지향성능 향상)

  • Kim, Sung-Su;Moon, Seong-Man;Kwon, Kang-Hun;Yun, Chang-Ryul
    • Journal of the Korea Institute of Military Science and Technology
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    • v.16 no.2
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    • pp.191-198
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    • 2013
  • Geo-pointing is a function that maintains LOS(Line of Sight) to a stationary ground target by controlling azimuth and elevation angles of a EOS(Electro-Optical System) which are calculated from aircraft navigation data and target coordinates. In design and implementation of the geo-pointing, a transmission time delay between GPS/INS and EOS is a major degradation factor of the geo-pointing performance when the aircraft is rapidly maneuvered especially. In this paper, a kalman filter is designed to compensate the transmission time delay of aircraft navigation data. Simulation and test results show that the geo-pointing performance is enhanced by the proposed compensation technique.

An Optimal Solution Algorithm for Capacity Allocation Problem of Airport Arrival-Departure

  • Lee, Sang-Un
    • Journal of the Korea Society of Computer and Information
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    • v.20 no.10
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    • pp.77-83
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    • 2015
  • This paper suggests heuristic algorithm to obtain optimal solution of minimum number of delay aircraft in airport arrivals/departures problem. This problem can be solved only mathematical optimization method. The proposed algorithm selects the minimum delays capacity in various airport capacities for number of arrivals/departures aircraft in $i^{th}$ time interval (15 minutes). In details, we apply median selection method and left-right selection method. This algorithm can be get the optimal solution of minimum number of delay aircraft for sixes actual experimental data.

A study on Improving Operation Efficiency of LCC through Parts Pooling (부품공유를 통한 저가항공사의 효율성 향상 방안 연구)

  • Choi, Se-Jong
    • Journal of the Korean Society for Aviation and Aeronautics
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    • v.23 no.1
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    • pp.120-125
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    • 2015
  • Passengers and Airlines wish neither delay nor cancellation due to aircraft defects. However, about 1 delay or cancellation case occurs out of 100 departures worldwide whereas 1 quarter case does in Korean domestic industry. Independent LCC carriers in Korea have almost double case. Most cases are recovered by replacing aircraft components. Airlines have prepared the spare components based on the reliability data by manufacturers to rectify defects or perform preventive maintenances. The total value for initial spares including engine is 40% of the aircraft price when they operate less than 5 aircraft. The more airlines operate the aircraft, the less the ratio of the investment for spares reflecting the economy of scale. This study intends to suggest how to improve the efficiencies as well as the safety of LCC throughout parts pooling including engines.

A Study on the Legislative System of Air Carrier's Liability in case of Delay of Passengers or Baggage (여객 및 수하물의 연착으로 인한 항공운송인의 손해배상책임제도에 관한 연구)

  • Kim, Ji-Hoon
    • The Korean Journal of Air & Space Law and Policy
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    • v.27 no.2
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    • pp.107-142
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    • 2012
  • An aircraft has been one of the most important transportation means and disputes due to damage caused by delay of the aircraft happen many times out of ones related to the air transport. In 2011, the Air Transport Act in Commercial Law was established to regulate national air transport and the legislative system of air carrier's liability to handle delay of passengers or baggage was legislated here. Although there are some clauses related to the legislative system of air carrier's liability, they are very important because they deal with disputes due to damage caused by delay of the aircraft. The Air Transport Act in Commercial Law has a good point of adopting the global standard of 1999 Montreal Convention, but it has also a bad point of having the problems of 1999 Montreal Convention. There are some contents to be modified in the Air Transport Act in Commercial Law. First, the definition of 'Delay of Aircraft' needs to be enacted because it is important to materialize air carrier's liability due to damage caused by delay. Second, it is necessary to modify the clause in which air carrier's liability due to damage caused by delay of passengers is divided into two things, one is in case of national air transport and the other is in case of international air transport, and the limited amount of air carrier's liability in national air transport is eight times less than the latter because they are not so helpful to air carriers but too disadvantageous to aircraft passengers. Third, it is also necessary to amend the clause in which the limited amount of air carrier's liability due to damage caused by loss damage or delay of baggage has been legislated same without classifying the case into loss damage and delay, because they are generally different from each other in terms of extent of damage, therefore the limited amount of air carrier's liability by delay of baggage should be classified into in case of loss damage and in case of delay. It is desired that the Air Transport Act in Commercial Law including the clauses related to air carrier's liability by aircraft damage be developed continually by sufficient study and discussion about the necessity of amending it such as the one mentioned above.

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Estimation of Annual Runway Capacity for Jeju International Airport Considering Aircraft Delays (항공기 지연시간을 고려한 제주국제공항 활주로 연간용량 산정)

  • Park, Jisuk;Yun, Seokjae;Lee, Youngjong;Baik, Hojong
    • Journal of Korean Society of Transportation
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    • v.33 no.2
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    • pp.214-222
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    • 2015
  • Jeju International Airport has become the most delayed airport in Korea, due to increased demand in air passengers and unexpected local weather condition. Observing the demands continuously grow for a decade, the airport is expected to be saturated in the near future. As a part of effort to prepare effective and timely measure for this expected situation, airport planners seeks the annual runway capacity, i.e., the appropriate number of flight operations in a given year with tolerable delay. In practice, the FAA formula is frequently adopted for the capacity estimation. The method, however, has intrinsic issues: 1) the hourly capacity imbedded in the formula is not clearly defined and thus the estimated value is vulnerable to be subjective judgement, and 2) the formula doesn't consider aircraft delay resulted from runway congestion. In this paper, we explain a novel method for estimating the daily runway capacity and then converting to the annual capacity taking into account the aircraft delay. In this paper, average delay of aircraft was measured using microscopic air traffic simulation model. Daily capacity of the runways were analyzed based on the simulation outputs and the method to assess the yearly capacity is introduced. Using a microscopic simulation model named TAAM, we measure the average aircraft delay at various levels of flight demand, and then estimate the practical daily runway capacity. The estimated daily and annual runway capacities of Jeju airport are about 460 operations a day which is equal to 169,000 operations year. The paper discusses how to verify the simulation model, and also suggests potential enhancement of the method.

A Study on Development of the Aircraft Scheduling System Using ILOG (ILOG를 이용한 항공기 운항 일정계획 시스템 개발에 관한 연구)

  • 윤종준;이장춘;이화기
    • Journal of the Society of Korea Industrial and Systems Engineering
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    • v.24 no.65
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    • pp.89-102
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    • 2001
  • In this paper, the aircraft route scheduling consists of two steps; the pairing generation and the aircraft assignment. The pairing generation is heuristic approach how flights construct pairings from and to the main base. The aircraft resource assignment which is to establish a aircraft route schedule is constructed by constraint satisfaction problem technique. ILOG solver and schedule is used to solve this problem. In addition, a aircraft route reschedule process against departure-arrival delay or aircraft maintenance schedule change is added by partial constraints satisfaction problem technique. Also, Gantt chart made by ILOG views is used to show aircraft route schedule results more easily.

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Aircraft CAS Design with Input Saturation Using Dynamic Model Inversion

  • Sangsoo Lim;Kim, Byoung-Soo
    • International Journal of Control, Automation, and Systems
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    • v.1 no.3
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    • pp.315-320
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    • 2003
  • This paper presents a control augmentation system (CAS) based on the dynamic model inversion (DMI) architecture for a highly maneuverable aircraft. In the application of DMI not treating actuator dynamics, significant instabilities arise due to limitations on the aircraft inputs, such as actuator time delay based on dynamics and actuator displacement limit. Actuator input saturation usually occurs during high angles of attack maneuvering in low dynamic pressure conditions. The pseudo-control hedging (PCH) algorithm is applied to prevent or delay the instability of the CAS due to a slow actuator or occurrence of actuator saturation. The performance of the proposed CAS with PCH architecture is demonstrated through a nonlinear flight simulation.

Compensation of Geo-Pointing Error due to Information Transport Delay for Electro-Optical Tracking System (전자광학 추적장비의 정보 전송지연에 따른 좌표지향 오차보상)

  • Yim, Jong-Bin;Moon, Seong-Man;Lyou, Joon
    • Journal of the Institute of Electronics Engineers of Korea CI
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    • v.48 no.5
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    • pp.1-7
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    • 2011
  • EOTS(Electro-Optical Tracking System) provides stabilized images while tracking a moving target. The key of geo-pointing is the function that fixes EOTS's sight to a specific position(geo-point) throughout aircraft maneuvers. In this paper, a major error source for the geo-pointing is identified as the transport delay of navigation information, and an augmented Kalman filter is designed to estimate the present attitude of aircraft using delayed navigation information. Simulation results including the presented scheme shows that the error due to the information transport delay reduces under half.

A Study on Congestion Change of Dual Airways between Korea-China (한·중 항로 복선화 전후 혼잡도 변화 연구)

  • Cho, Jin Ho;Baik, Ho Jong;Chang, Jo Won
    • Journal of the Korean Society for Aviation and Aeronautics
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    • v.28 no.1
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    • pp.7-13
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    • 2020
  • A significant growth in local air traffic volume is leading to airway congestion and flight delays especially for Incheon-China and Incheon-Europe sectors. A key method to increase the airway capacity is to place a supplemental airway parallel to the existing one and in cooperation between the aviation authorities between China and Korea, a dual airway track was implemented on December 6, 2018. Here, we use airline A's flight data to analyze the congestion change effect of the new airway. Results show total delay time to Europe is reduced 51% (13.4 to 6.6 minutes) as the delay distribution for 16-30 minutes, 31 minutes and greater decreased from 23.2% to 8.2% and 8.7% to 1.0% respectively. The delay to China also decreased but the drop is not as significant as flights to Europe. This is caused by the difference in flight distance, traffic volume, and characteristics of flights landing and transiting China. Flights to Europe show a broad distribution in altitude allocation and reduction in aircraft separation demonstrating the effectiveness of a dual airway track.