Link Analysis And Requirement Design Of Trunked Communication System In Civil Aircraft Flight Test

The development of large civil aircraft is a major strategic decision for China to build an innovative country,improve independent innovation capabilities,and enhance core competitiveness.At the same time,the development level of large civil aircraft also reflects the comprehensive national strength of a country,and it is a test of the integrity of China’s industrial system.The development process has carried the dreams of several generations of Chinese.Therefore,the large civil aircraft has a self-evident importance in national strategic planning and national rejuvenation.On May 5,2017,China’s first C919 with independent intellectual property rights completed its first flight at Shanghai Pudong International Airport in accordance with the latest international airworthiness standards.According to statistics,22 provinces,more than 200 enterprises,and 36 universities participated in the development of the C919.The success of the first flight of the C919 marked on the one hand a breakthrough in China’s large civil aircraft project and an important milestone in the development of China’s civil aviation industry.At the same time,the success of the first flight also kicked off the C919 flight test.The flight test process is a necessary step for the aircraft to conduct tests and collect flight data before its operation.Therefore,the flight test process is a very important process in the development of civil aircraft,which can verify the reliability of various parts and equipment of the aircraft.Because of this,the flight test must be as far as possible to detect potential safety hazards in commercial operations.This requires multiple,repeated,and various flight tests of the aircraft to ensure that the aircraft is in the most stable state before delivery.The state of flight,and therefore also requires considerable coordination between departments and professions.Based on this,how to uniformly command and dispatch a large team during the flight test has become the key to the smooth and efficient completion of the flight test mission.In order to solve this problem,this paper introduces the advanced mobile dispatching system of the trunked communication system into the flight test of civil aircraft,and for the first time,the organic integration of trunked communication and the flight test of civil aircraft is realized.Among them,the trunked communication system is a multi-purpose,high-performance wireless dispatching communication system.The introduction of the trunked communication system into civil aircraft flight test not only strengthens the communication ties between civil aircraft flight test teams,but also directly improves the efficiency of flight test.Therefore,in order to better combine the trunked communication system with the flight test of civil aircraft,this paper takes the link analysis and demand design of the trunked communication system in the flight test of civil aircraft as the entry point,by collecting the actual flight test team requirements,the system’s link measurement model and requirements model are designed.Then,the nonlinear global optimization algorithm was used to determine the demand function of the trunked communication system with stability and economy.Based on the optimized system requirements,the reliability of the link in the trunked communication system is mainly studied.Some parameters in the link measurement model are selected for simulation calculation and verification,and the system communication under different environments and conditions is analyzed.The performance proves that the trunked communication system designed in this paper can meet the practical requirements of civil aircraft test flight teams.In addition,in response to the sudden link situation that the civil aircraft test flight team may use in the process of using the trunked communication system,the hazard of the system links were identified and security risk assessments were made,and risk mitigation measures were formulated to control in order to design a command and dispatch system with rich functions,stability and reliability for the civil aircraft flight test team.