A doppler element solving method based on pulse azimuth
The active sonar pulse signal emitted by ships has high sound source level,narrow frequency band,and high signal-to-noise ratio.By utilizing these characteristics,the azimuth and frequency information of the sonar pulse signal can be accurately measured,which is conducive to the calculation of target motion elements.This article proposes a Doppler method for calculating target elements of underwater targets that emit active pulses based on the azimuth of active sonar pulses.Firstly,estimate the time position and frequency of the active pulse signal.Based on this,use nonlinear regression method to treat the multidimensional vector composed of the time,azimuth,frequency of each pulse,as well as the velocity and position of the corresponding time on the platform,as a point in the sample space.According to the functional relation-ship between each element,perform nonlinear fitting to obtain the estimated value of the target motion element.The verifica-tion of actual measurement data shows that the accuracy of the proposed frequency estimation method meets the require-ments of target motion analysis.The simulation verifies the overall effectiveness of the pulse azimuth frequency target mo-tion analysis algorithm based on nonlinear regression.
active pulse signalDopplersolving elementsnonlinear regression method
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