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本文提出了三频带信号时频处理的样条函数新方法．该方法能够按不同频率特性自动地对信号进行分离和处理．本文从理论上证明了最优空间的等价性定理和逼近空间的相容性定理．应用该方法对运载火箭的外弹道跟踪测量信号进行分析处理，成功地分离了测量信号中的轨道、漂移误差和随机误差．
In this paper, a new spline function method for time-frequency processing of three-band signal is proposed. This method automatically separates and processes the signal according to different frequency characteristics. This paper theoretically proves the equivalence theorem of the optimal space and the compatibility theorem of the approximation space. The method is applied to the analysis and processing of the external ballistic tracking measurement signal of the launch vehicle. The orbit, drift error and random error of the measurement signal are successfully separated.