Table of Content

25 April 2014, Volume 32 Issue 2

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Civil Aviation

Design and implementation of single-channel constant modulus anti-interference civil aviation VHF receiver

WU Ren-biao,WANG Xin-peng,HU Tie-qiao,SHI Qing-yan,WANG Wan-wei

2014, 32(2):  1-5. 

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To eliminate the impact of constant modulus interference on civil aviation VHF voice communication,the anti-interference receiver based on single-channel constant modulus algorithm has been designed and implemented on FPGA and DSP platform. First the carrier frequency of interfered AM signal is estimated by using DSP in the interference suppression system of the anti-interference receiver,then the processes of carrier suppression,orthogonal transformation as well as real-time estimation of the constant modulus interference based on nonlinear least square method and interference suppression are implemented in FPGA. System testing demonstrates the anti-interference receiver can suppress interference effectively and has the features of fast processing and good stability.

Flow control model of terminal airspace based on runway capacity

ZHANG Hai-tian,LUO Jun-di,ZHU Xiao-long

2014, 32(2):  6-10. 

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Runway capacity is an important limiting factor of terminal capacity. The distribution of air traffic flow directly influences the degree of saturation in terminal airspace. To keep air flow stability and efficiency in terminal airspace,a flow control model based on runway capacity is established. The model considers the factor of nonsustainable busy runway impacting on capacity. Based on the actual data of Wuhan terminal,the model is used to calculate the runway capacity and its corresponding terminal capacity. Then,the separation of flow control is calculated for twenty-minute-interval mode and one-hour-interval mode taking into account the non-sustainable busy runway factor. Finally,corresponding air traffic flow control measures are made based on the assessment results,which accord with the practice and validate the feasibility and applicability of the proposed model and method.

Risk factor identification of area control based on operation analysis method

TAO Mei, JIA Yan-tao

2014, 32(2):  11-15. 

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Risk factor identification of area control is studied based on operation analysis method and causality analysis method. Area control task is analysed,and area control flow diagram which inludes every minimum task unit is established according to the requirements of operation analysis method. Then risk factors in every minimum task unit are identified using causality analysis method. At last,85 risk factors of area control operation are dentified and classified including 57 controller factors,10 device factors,8 environment factors and 10 management factors.

Capacity modeling and analysis of closely spaced parallel runways based on SPN

WANG Jie-ning,XU Ning-xia,JIANG Gao-yang

2014, 32(2):  16-22. 

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Runway capacity plays an important role in airport capacity assessment. Traditional methods focus on special rough mathematical model building according to runway operational cases. A novel assessment model for closely parallel runway capacity is proposed based on stochastic Petri net(SPN). Firstly,an SPN model is built to depict the assessment process. Secondly,the homogeneous Markov chain is induced and system steady-state probability is established in accordance with SPN model. Then a consequence representation for a given runway operation is attained to assess runway capacity in different situations. Concretely,the influencial factors of runway capacity are mapped into corresponding transition firing rates. Compared with traditional methods,this one has a high reusability in model and more flexibility in parameter adjustment,which can be seen as a new solution for runway capacity calculation and analysis.

Plan of backbone air route network based on route crossing waypoint setting by geometric method

WANG Li-li,WU Yue,WU Tong-shui

2014, 32(2):  23-26. 

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As the air traffic demand is growing quickly,the current air route network should be adjusted to accommodate the development of air transportation. The design of the backbone air route network is discussed based on the airspace of China. The backbone air route network is the one which meets the gradually growing aviation business. Firstly,several hub airports and seven border points are selected as the nodes in the backbone route network. After the hub nodes are selected,the air routes between these nodes are optimized by some conditions such as air traffic flow,angle,etc. Then some route crossing waypoints are set to further optimize the network performance.The sum of distance between the waypoint to the hub airports in the zone is shortest.After the prohibited zones in our airspace are considered,one backbone route network plan has been given at last.

Applied method for gate assignment in airport

YANG Yue,WANG Ben,LIU Yang

2014, 32(2):  27-32. 

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Gate assignment is one of the important tasks in Airport Operation Center (AOC). A logical gate assignment method could decrease airline'delay time and improve operation benefit as well as service quality. A method of gate assignment is introduced aiming at the maximum utilization ratio of the near gates and the minimum ambulation distance for the transfer passengers. An optimized algorithm for preparative gate assignment is also proposed according to the distribution and attribute of gates in airports. Based on those results,a gate reassignment method is designed against the interferential problem caused by delayed aircraft. The calculation result shows that this method provides a valuable reference for improving the assignment efficiency in AOC,enhances the operation benefit and service quality simultaneously,as well as solves the interference to the pre-assignment problem caused by delayed aircraft at a certain extent.

Fuel conservation research based on route planning

GU Run-ping,CHEN Hui

2014, 32(2):  33-35. 

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The objective of optimization model is to minimize the airlines'fuel cost. Several factors are considered to confirm the optimal composition of airplane types and fleets and to achieve fuel conservation,such as flight frequency on each air route,traffic demand of certain airplane type,route restrictions with the airplane types and the available time of fleet. One mathematical programming model is introduced;meanwhile,the analysis and evaluation of the model applications are presented with example.

Study on composite of aircraft structures under accelerated ageing conditions

JI Zhao-hui,LIU Kuo,BAI Yun,LIANG Ji-yong

2014, 32(2):  36-39. 

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Three accelerated ageing conditions of salt spray,ultraviolet and hygrothermal are tested on the composite of aircraft structures. The cycle acceleration experimental parameters are established. The hygroscopic law of different accelerated ageing cycles is analysised and the tensile mechanical properties are studied. The fracture mode and fracture morphology are observed. The results show that the hygroscopic capacity after 5 accelerated ageing cycles in accordance with Fick's second law. With the accelerated aging cycle carrying on,the maximum tensile strength and the failure mode are gradually decreased. The descent rate is fast in the beginning and slow in the late stage and finally stabilized. They are inversely proportional to moisture absorption. After the ultraviolet light irradiation the sample surface is gradually losing its luster. The colour is changed from white to dark brown and the resin is photoaging. The types of the fracture mainly include debonding between fiber and matrix.

Research on aircraft optimal maintenance cycle based on probability and maintenance economy

WANG Qun,GENG Hong

2014, 32(2):  40-43,48. 

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Aircraft airworthiness management of CAAC has been carried out for more than 20 years and remarkable achievements have been initially established,setting up a reliability centered aircraft repair management and repair management mode. But in the actual aircraft repair work,the aircraft system safety,reliability,maintainability and economy must be taken into account. Starting from rate of cost or expense and the efficient use of time from aircraft systems or components of the unit,the theoretical analysis model and analysis method are set up,using the optimization criterion to calculate the aircraft system scheduled preventive maintenance and repair cycle with the minimum average cost rate;in order to achieve the most economic and optimal repair cycle,these are important bases of revised "repair scheme"and "reliability scheme",but also foundation to ensure the flight safety.

Antomatical identification and tracking of MCS based on satellite cloud image

DUAN Lian,LIU Fan,WU Jun-jie

2014, 32(2):  44-48. 

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Mesoscale convective system (MCS)is often accompanied by hail,thunderstorm,squall line,spout and some other severe convective weathers,it could not only lead a huge destruction to the airframe structure,but also pose a serious threat to the safety of crew and passengers. While,the identification and tracking of the location and development tendency of MCS is the emphasis to the study. According to the previous improved criterion,Matlab image processing techniques are applied to the identification and tracking of MCS. With Matlab software,satellite data are provided by National Satellite Meteorological Center,and then its characteristic parameters are calculated and analysed. The experimental results show that this method could not only realize the MCS identification automatically,but also achieve MCS tracking continuously and effectively. An effective theoretical basis and practical reference are provided to the en route avoidance,the flight rerouting path planning and air route intelligent selection for dangerous weather.

Design and implementation of airport noise monitoring terminal based on Android system

LI Guo,LI Cheng-tong,HAO Pei-pei

2014, 32(2):  49-54. 

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Considering that the traditional airport noise monitoring terminal can not monitor noise as a mobile terminal,a platform of Android system is proposed for airport noise monitoring terminals to achieve real-time on-site monitoring of airport noise. The design of airport noise monitoring terminal includes hardware and software,and makes automated testing for the terminal. The results show that the system is reliable and stable,achieving the aim of real-time on-site monitoring of airport noise.

Effectiveness evaluation of airport bird strike prevention system

QIAO Liang,ZHANG Liang

2014, 32(2):  55-58. 

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Currently,there are a lot of problems in the airport bird strike prevention practice,especially the determination of bird strike prevention index system,as well as the optimization of the evaluating methods. In this regard,the idea of 'integrated prevention and control'is proposed,using AHP combination of gray fuzzy theory to establish an evaluation model. Taking Baiyun Airport as an example,comprehensive evaluation of bird strike prevention system is constructed. As can be seen,Baiyun Airport's bird prevention system is sound. However,due to the lower theory level of bird prevention staff,as well as the lack of bird intelligence information,information system and anti -bird plans,there are certain aspects need to be further improved such as ecological environment,staff calibre and institutional development. The evaluating results are basically in accordance with the actual existence of Baiyun Airport,showing that the gray fuzzy comprehensive evaluation approach is suitable for the effectiveness evaluation of bird strike prevention system.

Civil Aviation Management

Civil aviation passenger throughput forecasting research based on combination forecasting method--Capital Airport

CHEN Yu-bao,ZENG Gang

2014, 32(2):  59-64. 

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"Twelve Five"development period will be the golden age of China's civil aviation industry. Aviation passenger throughput will be also rapidly added. Beijing Capital International Airport is the largest civilian airport. It will be significant to research its passenger throughput by scientific and rational method. This passage makes full use of the latest historical data,using multiple linear regression models and time series trend extrapolation model to predict the 2012-2016 passenger throughput of Beijing Capital International Airport. In order to overcome the defects of the two single methods,the portfolio weighting method will be used to determine the results. Finally,a combination of predictive value and historical value of the error analysis results show that: the combination forecasting method can improve the forecast accuracy and reduce forecast error.