System level link budget method
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摘要: 计算地面站和飞行器之间的通信链路余量问题常依赖于简单的数学叠加法,但在实际应用中,复杂飞行器模型以及气候条件等干扰因素都容易造成天线方向图的畸变,从而导致链路预算不准.为了尽可能准确评估链路性能,提出了一种系统级链路预算评估方法.应用旋转变换矩阵,建立了姿态变化造成天线方向图相对变化的关系式.仿真得出装机后天线方向图畸变信息.根据相对变化量对方向图信息作数据挖掘.按全系统链路余量表达式计算变姿态情况下链路余量.评估了一种超短波通信天线与地面站天线间的通信链路性能,以及飞机降落时航向天线和航向台站之间的通信链路问题,表明该方法具有一定工程应用价值.Abstract: A simple mathematics iteration method was used to calculation of communication link margin between the ground station and aircraft in the past. However, factors such as complex vehicle model and climate conditions can cause radiation pattern distortion in the actual application. A method to assess the system level link budget was constructed. The relative changes equation of antenna radiation pattern caused by attitude change was established by applying rotation transformation matrix. Radiation pattern distortion information of installed antenna was simulated. Radiation pattern was used to data mining according to the relative changes variation. The link margin was computed under variable attitude by applying entire system link margin expression. Finally, examples about communication link performance between the ground navigation station and aircraft ultra-shortwave antenna, and between the ground heading station and aircraft heading antenna were used to validation the practicality of this method.
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Key words:
- aircraft /
- datalink margin /
- radiation pattern distortion /
- datalink budget
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