Passive Estimation Method For Motion Parameters Of Underwater Near-Field Moving Target

The Doppler effect will affect the accuracy of passive positioning, but it can provide more target motion information. Passive positioning for moving target in the near field is always difficult. In order to make better use of the Doppler information of the moving target in the near field, this paper proposes a passive estimation method based on the Doppler coefficient difference. The mapping relation between motion parameters and Doppler coefficient difference is derived. By using the differential evolution algorithm, according to the least squares criterion, the target motion parameters are obtained. The simulation analysis shows that the differential evolution algorithm can estimate the motion parameters of the near-field target under the condition of reasonably setting the upper and lower bounds and the algorithm parameters. And the tolerance of this estimation method to the estimation error of the Doppler coefficient difference can also meet the general application requirements. When this algorithm is applied to a linear array, the estimation accuracy is higher for targets that are closer to the center of the array and have a smaller angle with the normal direction of the array, while the estimation accuracy of targets in the long distance and with a large angle in the normal direction of the array is lower.