基于现场可编程门阵列战术数据链中自适应轮询接入控制协议的设计与实现

在战术数据链系统中，战术单元随时都有可能被摧毁而引起网络拓扑结构动态变化，导致系统服务效率降低。为了解决这一问题，基于动态调整轮询顺序的思想，提出一种自适应轮询接入控制协议（APACP）。采用概率母函数的方法和嵌入式马尔可夫链理论对系统进行建模，得到系统平均排队队长和平均轮询周期的解析解；利用数学软件MATLAB和现场可编程门阵列仿真验证协议的正确性。仿真结果表明，APACP能够根据战术数据链网络拓扑结构的动态变化自动调整轮询顺序，明显降低系统平均排队队长和平均轮询周期，克服传统轮询接入控制协议中空轮询的问题，节约了服务时间，提高了服务效率，改善了系统性能。

Design and Implementation of Adaptive Polling Access Control Protocol Based on FPGA Tactical Data Link

In the tactical data link system, the tactical unit may be destroyed at any time to cause the dynamic changes in the network topology, resulting in reduced system service efficiency. In order to solve this problem, an adaptive polling access control protocol (APACP) is proposed based on the idea of dynamically adjusting the polling order. The system is modeled by the probability generating function method and the embedded Markov chain theory to obtain the analytical solution of average queue length and average polling period of system. Then the MATLAB and field programmable gate array (FPGA) are used to verify the protocol in simulation. The simulated results show that the APACP protocol can automatically adjust the polling order according to the dynamic changes of the tactical data link network topology, which significantly reduces the average queue length and average polling period of system, and overcome the empty polling of traditional polling access control protocol, thus saving the service time, improving the service efficiency and improving the system performance.