一种改进对称波束的低仰角闭环跟踪算法

摘要

To track the low elevation targetsusing array antenna,we have to mitigate the multipath effect.Based on the two-path multipath propagation models,the principle and constraint condition of symmetric beam mitigating multipath effect is studied,and a closed-loop tracking algorithm by improved symmetric beam constructed by difference beam phase toggling in two pulse periods is devel-oped.Results of simulation indicate that the proposed method can improve the angle resolution of the beam and the multipath error is im-proved obviously.%采用阵列天线跟踪低仰角目标时需要克服多径效应的影响。建立了低仰角环境下的二径模型，在此基础上研究了对称波束消除多径效应的原理和约束条件，提出了一种利用相邻脉冲差波束相位跳变构造对称波束的闭环跟踪算法。该方法有效改善了跟踪波束的角度分辨能力，多径效应引起的误差得到明显改善。