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A measurement method for Doppler frequency rate-of-change with coherent pulse train

The information of target's acceleration is reflected in the Doppler frequency rate-of-change of the received radar signal. Limited in target's velocity, the information of Doppler frequency rate-of-change is very subtle. This information is quite difficult to measure precisely since it is very subtle and the pulse duration is very short. Therefore, a precise method is proposed to measure this information based on Morlet wavelet transform. Morlet wavelet transform has low signal-to-noise ratio (SNR) threshold. According as auto correlating the wavelet transform coefficient of radar signal, the Doppler Frequency rate-of-change is enhanced and phase ambiguity is unwrapped. By exploiting the coherent property of pulse train, the observation time is extended equivalently and so the measurement precision is improved greatly. The simulation study shows that this method has low SNR threshold and obtain the parameter measurement fast and accurately.