基于和差波束测角的角度跟踪仿真研究

Simulation Research of Angle Tracking Based on Angle Measurement of Sum and Difference Beams

飞机、导弹等高速运动载体与卫星系统实时通信过程中,载体的姿态变化,会影响通信质量。为使载体上的相控阵天线始终对准卫星方向,保持载体与卫星正常通信,提出了一种角度跟踪系统设计方案,对系统关键部分的功能进行说明;针对均匀对称的矩形阵列,在单脉冲测角理论和卡尔曼滤波算法的基础上进行研究和改进,提出了基于和差波束测角和自适应α-β滤波的角度跟踪算法,实现了对来波的角度测量与跟踪。通过仿真,对系统测角精度与跟踪精度进行说明,结合算法原理分析影响系统跟踪精度的因素。

In the process of real-time communications between high-speed motion platforms such as aircraft, missiles and a repeater satellite, the postures of platforms change all the time, which affects the quality of communication seriously. For keeping communications with the satellite, the phased array antenna on them must aim at the direction of satellite all the time. The design of angle tracking system is given, and the key functions of the system are introduced. For the rectangular array with symmetrical and uniform characteristics, by studying and improving the traditional theory of monopulse angle measurement and Kalman filter, an angle tracking algorithm based on sum-difference angle measurement and adaptive α-β filtering is proposed. Through simulation, the angle measurement and tracking precision is given, and the factors affecting the system tracking precision is analysed.