地面天线目标捕获技术分析

针对空中机动平台与地面站宽带通信中的目标捕获问题，提出了地面天线目标捕获概率和捕获时间的计算方法。在数学建模的基础上，分析了不同天线扫描方式、扫描速度、飞机飞行状态的参数选择对捕获概率和捕获时间的影响，推导了其捕获概率的计算公式。仿真结果表明：初始捕获阶段，光栅扫描的捕获概率和捕获时间都明显优于螺线扫描；而在失锁重捕阶段，螺线扫描的捕获概率更高，且不受扫描速度的影响。该仿真结果已在工程设计中应用。

Analysis of target acquisition technology by ground antenna

For target acquisition in broadband communication between mobile platform and ground station,a calculation method for target acquisition probability and acquisition time by ground antenna is proposed.By mathematical modeling,influence of parameter selection of antenna scanning style,scanning speed and aircraft flight status on acquisition probability and acquisition time is analyzed,and the computation formula of acquisition probability is derived. Simulation results show that,at initial acquisition stage,the acquisition probability and acquisition time by raster scan exceed those by helical scan,and at losing lock reacquisition stage,the acquisition probability by helical scan is higher and independent of scanning speed. These simulation results have been applied in engineering design.