Identification of Sweep Jammer Based on Energy-azimuth Feature for Acoustic Homing Torpedo

A sweep jammer is one of the main jammers that countermeasures underwater acoustic homing torpedoes during target identification. To improve the identification ability of the sweep jammer for acoustic homing torpedoes, the jamming mechanism of the sweep jammer in target detection is analyzed according to the particular sweep signal in its energy and azimuth feature parameters, which are received by the torpedo. Based on the analysis, a method combining the energy and azimuth features to identify the sweep jammer is proposed, and the energy and azimuth features are extracted through the digital processing of signals received by the torpedo, and jammer identification is performed based on the result of weighted fusion with these two feature parameters. This is an active detection method that overcomes the disadvantage of using a single parameter to identify and increases the reliability of jammer identification with the combined judgment of these two feature parameters. The effectiveness of this method is verified by establishing a model to simulate real signals received by an acoustic homing torpedo.