在计算中低轨道移动卫星对固定业务地面站干扰时 ,如何缩减计算时间是个突出的问题。该文提出了加大计算步长和设置仰角阈值两种方法 ,分析了理论上减少计算时间的可能性 ,并通过典型的实例计算研究了这两种方法对计算精度和计算时间的影响。结果表明 ,取样步长往往可以取到相当大 (2 0 0～ 30 0 s左右 ) ,从而使得计算时间大大减小 ;另外 ,通过设置合理的仰角阈值 (15°左右 ) ,引起的误差是允许的 ,也能使得计算时间减少为原来的 90 How to reduce the calculation time is a prominent issue in the calculation of the interference of low orbit mobile satellites to the fixed service ground station. In this paper, we propose two methods: increasing the calculation step and setting the elevation threshold, and analyzing the possibility of reducing the calculation time in theory. The influence of these two methods on the calculation accuracy and calculation time is studied through typical example calculation. The results show that the sampling step size can often be taken quite large (about 200 ~ 30 0 s), which makes the calculation time is greatly reduced; In addition, by setting a reasonable elevation angle threshold (about 15 °), the error is allowed , Can also make the calculation time reduced to 90