Micro-Doppler Parameter Estimation of Ships Based on the Viterbi Algorithm

The Viterbi algorithm is a dynamic programming algorithm used to find the Viterbi path-hidden state sequence that is most likely to generate the observed event sequence. The algorithm principle only needs iteration and backtracking, and it has a wide range of applications. Using the Viterbi algorithm-based micro-Doppler parameter estimation to separate multi-target multi-echo composite signals has a better effect. It only needs to be executed at the points of the image. The result of the processing is the signal curve. Moreover, according to the different characteristics of the signal image, it can ensure that the signal does not lose information to a certain extent. One or more targets often have multiple echo signals superimposed and coupled. However, because the micro-Doppler echo signals affected by the sea state are all coupled with the sine wave signal of the sea wave, different amplitudes determine paths of different lengths. Find the Viterbi path to extract the micro-Doppler echo signal. The target echo signal parameters of the micro-Doppler feature are of high precision, and the marine target has a micro-Doppler echo signal that is naturally affected by the ocean waves. The ship's stability determines this, and it is also doomed. According to the difference in the characteristic parameters of the echo signal, the extraction of the characteristic parameters can further identify the ship's target.