Research On Tactical Data Link Protocol Based On Polling And FPGA Design And Implementation

With the rapid development of science and technology,information warfare has become the trend of future wars.As an important part of information warfare,tactical data link systems play an increasingly obvious advantage in warfare.The tactical data link can overcome the defects of poor communication,difficult coordination,and low hit rate in traditional operations.It can timely and effectively transmit combat information between various services and combat platforms,control weapons and equipment for precise strikes,and form a modernized warfare with automated command and control.The MAC protocol,as a "traffic rule" for each unit in the data link system to operate effectively,determines the channel allocation and management.The MAC protocol based on the polling mechanism can reasonably use the channel under the unified scheduling of the central node.Its network structure corresponds to the affiliation of the army,which can meet the situational awareness and command and control requirements in the combat process.It’s widely used in data link systems.However,most of the previous researches on polling protocols stayed in theoretical simulations,and basic polling protocols could not meet all the requirements of war.Therefore,based on the actual requirements of hardware simulation and war,and combined with the actual MAC protocol,this paper does the following:Firstly,this paper analyzes the performance indicators of the three polling protocols(gated,exhausted,and limited(K = 1)),and uses the excellent characteristics of the FPGA to design and implement the three protocols in sub-modules.After the design is completed,the modules are connected according to functions,and the system is simulated after setting the simulation conditions.After simulation,the performance parameters are statistically analyzed,the simulation results are compared with the theoretical values,and the correctness of the system is verified through two methods: function realization and statistical parameters.Secondly,aiming at the characteristics of high sending permission of priority stations and low sending permission of slave stations in the data link system,a priority continuous service access control protocol(PCACP)is designed,and a continuous service mechanism is embedded in the protocol.The PCACP effectively guarantees that information packets collected by priority stations can be sent out in a timely manner.At the same time,the continuous service mechanism can be used to shorten the waiting time between sites,which shorten the queue length of the information packets in the stations.Thirdly,based on the fact that the tactical data link stations may be destroyed in the actual combat environment,and the new stations are added to the network to cause the network topology to change,an adaptive polling access control protocol(APACP)is designed,which can automatically adjust the polling order according to the dynamic change of the network topology,filter out stations that do not send information,overcome empty polling and improve system service efficiency.At last,the two protocols were simulated with MATLAB to verify the theoretical correctness of the protocols.FPGA was use to design and implement the system.The hardware test data is compared with the theoretical value.The test data is consistent with the theoretical value,and the protocol is verified from both the functional and performance indicators.