ML法能够很好的估计信号的信噪比,FIR 底通和带通滤波器和IIR 底通和带通滤波器，包括轨道机动仿真、初轨计算。- ML estimation method can be a good signal to noise ratio, Bottom-pass and band-pass FIR and IIR filter bottom pass and band-pass filter, Including orbital maneuvering simulation, initial orbit calculation.