Modeling And Simulation Of Helicopter Data Link Availability

A data link is a communications command system that transmits and distributes formatted messages,enabling the interconnection of otherwise independent combat platforms.The highreliability service provided by the high-availability helicopter data link is the basic guarantee of combat command,so the availability assessment of the helicopter data link system has become an urgent need to be met.Based on availability theory and Link-16 data link technology,this paper presents a Markov steady-state availability model for evaluating the availability of data link systems.Based on this,further consider the exchange requirements of a large amount of business data in the tactical environment,and the key factor affecting the global availability of the data link system,which is the ability of the data link system to complete the specified tasks within a specified time.Availability” and “business compliance rate” were quantified respectively,and a business-based usability evaluation model was proposed,and the key indicator for examining the real-time performance of data link business-delay was represented,and the above models were analyzed and analyzed.Simulation.On the basis of the aforementioned theory,the subject also established a simulation evaluation model of helicopter data link availability,and simulated and analyzed the availability of the data link system under the conditions of different influencing parameters.The main work carried out is as follows:（1）Study the availability theory of the communication network system and the working characteristics of the data link.Through the abstraction and simplification of the communication network system,the method of the finite state Markov chain is used to analyze the state of the helicopter data link network system,and the helicopter data link network system is analyzed.Data link steady-state availability model.On this basis,a service availability model of helicopter data link represented by delay performance is given for the index requirements of system service operation performance.The model is based on the steady-state availability of the system,combined with the operation compliance rate of the "delay" performance,and finally obtains the service availability of the studied data link system.（2）In view of the requirements for establishing the simulation model of the data link system in the helicopter data link availability simulation evaluation,the time slot structure,access method and mission planning of the helicopter data link are studied.The concept of "time slot pool" gives the time slot allocation strategy of helicopter data link based on binary tree.The helicopter data link network is planned by the method of configuring the " Schematic diagram of parameter design ".Through the verification and analysis of the measured delay in the laboratory environment,it can be seen that the error between the measured delay and the simulation delay result is 2.22%,which proves the validity of the established helicopter data link simulation model.（3）On the basis of the above research,this paper uses OPNET simulation software to create and load the fault/repair model and time slot allocation strategy for the requirements of helicopter data link availability simulation modeling.Delay probability distribution model for validation.Then,by setting different availability experimental conditions,such as failure/repair strength and time slot pool size,the service availability simulation evaluation of helicopter data link is carried out.Pool allocation has a larger impact.When the strength of the failure/repair ratio is higher,the steady-state availability is better,and the service availability performance is also guaranteed;and the more sufficient time slots can be obtained by the network participating group,the higher the system delay compliance rate is,and the data link service Real-time availability will also be better.Combining the characteristics of the data link communication system,this paper analyzes the availability of helicopter data link and its influencing factors,and proves the effectiveness of the proposed system availability evaluation model and helicopter data link simulation model through experiments.The specific methods that can be operated have certain reference value.