Both the blind zone and the widely employed structures of antenna pedestal in satellitic tracking during zenith pass are briefly reviewed, algorithm for program tracking of three-axis tracking sys-tem is derived theoretically. Aiming at no-blind zone tracking system by A+E+TIL structure, influence on tracking performance by mutual coupling during zenith pass is analyzed. A solution is presented, and sim-ulation results show it could effectively improve the accuracy of tracking system.%简要介绍卫星过顶跟踪时出现的盲区现象和常用的卫星过顶跟踪天线座结构形式,理论上推导了三轴跟踪系统的程序跟踪算法.针对A+E+TIL形式的无盲区跟踪系统,推导了其过顶跟踪时产生的交叉耦合对跟踪性能的影响,并提出了解决方法.仿真结果表明,该方法可以有效提高系统跟踪精度.
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