多飞机着陆测距信号的功率控制策略

Research of Power Control Strategy of Range Signal on Airplanes Landing

在飞机着陆系统中,进行询问回答式测距时,每一个飞机的询问信号都可能会成为其他飞机的干扰。在有限的可用功率下,就需要一个可靠和高效的功率控制策略。主要分是否发送功率控制指令两类进行研究,在无通信功率控制方法时,推导了飞机的发射功率方程,分析了此方法的不足。在需要发送功率控制指令的情况下,着重分析了固定步长和基于纳什博弈论的功率控制。并对以上讨论的功率控制方法都进行了仿真分析,并对比说明了优缺点。基于纳什博弈策略的功率控制算法收敛快,且发射功率较固定步长迭代处于一个较低的水平上,说明基于纳什博弈策略的算法减小了发射功率,节约了能耗。能够满足像飞机这样高动态运行体的需求。对功率控制策略选择提供参考。

In a landing system,each airplane＇s asking signal contributes to the interference seen by the other airplanes when it is ranging through asking-replying.In a given condition of limited available power,a reliable and effective power control strategy is needed.According to whether the ground station transmits instructions of power control,this research is made up of two parts.With no communication power control method,the equation of transmitting power is deduced and the shortage of the method is analyzed.The research places emphasis on the analysis of power control of fixed step and based on Nash game in the situation that the ground station needs to transmit instructions.Every method above has been simulated and the advantages and disadvantages are expatiated respectively through comparison.The method based on Nash game has a faster constringency and transmitting power stays at a lower level than fixed step,which means that the use of the method based on Nash game reduces the transmitting power and saves energy.So the method can meet the demands of high dynamic body like airplane.This scheme may provide a reference for the choice of power control strategy.