A Signal Processing Method of Random Pulse Interval Sequence
A random pulse and signal processing technology, applied to radio wave measurement systems, instruments, etc., can solve the problem that the fast Fourier transform cannot effectively extract the Doppler change law, the echo phase change law is complicated, and the target signal distance ambiguity cannot be suppressed and Doppler ambiguity etc.
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[0149] Based on the method proposed by the present invention, the target parameters are estimated for the simulated echoes in the three-target scene, where the target amplitudes differ by 30 dB in turn, considering the distance blind area caused by pulse occlusion and short-range strong clutter, and the background noise is complex Gaussian noise. figure 1 It is a schematic diagram of the frequency response of the orthogonal projection filter. The horizontal axis is the Doppler frequency in kHz, and the vertical axis is the normalized frequency response in dB. figure 1 It embodies the good effect of the orthogonal projection filter to filter out single-frequency signals. Figure 2(a), Figure 3(a) and Figure 4(a) respectively show the |Z after the first, second and third Doppler filtering 2 The output result of the distance dimension corresponding to the Doppler frequency unit where the peak value of | is, the abscissa is the distance, the unit is km, and the ordinate is |Z 2 Th...
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