{'fraction_non_alphanumeric': 0.01085972850678733, 'fraction_numerical': 0.0, 'mean_word_length': 4.760416666666667, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Poles Extraction of Underwater Targets Based on Matrix Pencil Method

The majority of the sonic frequency bands used in active sonar detection and identification are within the resonance region of the target. The poles of target are very important characteristics of the resonance region. This paper analyzes and studies the method of extracting poles by using the matrix Pencil Method. A method which can determine the number of poles of underwater target automatically is proposed. It can average the poles that are gathered to synthesize a point as an alternative pole. Then by setting up a reasonable threshold. The poles with the higher energy in the target echo is extracted as the main pole. Aiming at the problem that the main poles of the target are missing or there are false poles in some directions, the main poles extracted from multiple directions of the target are integrated to obtain the final poles of the target. Finally, to prove the feasibility of proposed novel method echo pole extraction, the experiment was conducted in underwater spherical shell and thin rod in a silencing pool.