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由于发动机后效段烧蚀不稳定、加表存在测量误差等原因,采用发动机后效段加表数据作为导弹级间分离点火判据时,必须对加表测量得到的原始数据进行滤波,以减小数据跳动,提高分离时刻的准确性。本文从滤波平滑度、实时性和计算量3方面对4种滤波方法:动窗平均法、动窗拟合法、频域滤波法和数字滤波法进行了对比分析。仿真结果表明,数字滤波法的计算量非常小,滤波平滑度比较好,比动窗平均法更适合于工程应用,但工程应用时必须对时延带来的数据偏差进行补偿;动窗拟合法滤波效果相对略差,计算量稍大,但实时性好,工程上可以考虑使用;频域滤波法滤波平滑度非常好,但计算量太大,工程上尚难以应用。
As the post-stage engine ablation instability, there are measurement errors and other reasons plus table, the use of the engine after the paragraph plus table data as the ignition level separation missile criteria must be added to measure the raw data obtained by the filter to reduce Small data beats, improve the accuracy of separation time. In this paper, four kinds of filtering methods: moving window averaging method, moving window fitting method, frequency domain filtering method and digital filtering method are compared from the aspects of filtering smoothness, real-time performance and computational load. The simulation results show that the computational complexity of the digital filtering method is very small and the filtering smoothness is better than the moving average method is more suitable for engineering applications, but the engineering application must compensate for the data deviation caused by the delay; dynamic window fitting method Relatively poor filtering effect, the amount of calculation slightly larger, but real-time, engineering can be considered for use; frequency domain filtering filtering smoothness is very good, but the calculation is too large, the project is still difficult to apply.