Flight Parameters Measurement Based on Underwater Acoustic Signal Processing

The underwater acoustic signals excited by a single point source in the air are simulated using equivalent source theory. The CPA-distance to and the CPA-moment are estimated using the feature of Doppler frequency shift. The piecewise cross spectral density method is used to measure the instantaneous frequency and then the accuracy of the parameters is improved. The simulation analysis results show that: (1) The higher the ratio of effective passing time to sampling duration time, the higher accuracy of the flight parameters estimation; (2) In the condition of 0dB SNR and 15 times the ratio mentioned above, the estimation accuracy of the CPA-distance is better than 10% and the accuracy of the CPA-moment is better than 6%.