A multi-output information fusion method and system based on azimuth history

Abstract

The invention relates to a multi-output information fusion method based on azimuth course. The method comprises the following steps: frequency-domain beam-forming is performed on signals received by all elements; sub frequency unit energy calculation is carried out on a frequency-domain output result to obtain beam outputs of different sub frequency units; maximum value detection is carried out on the beam outputs according to different sub azimuth intervals, a beam pre-forming azimuth corresponding to the maximum value is taken as the target azimuth of the current sub azimuth interval, and the beam pre-forming azimuth corresponding to the maximum value and the maximum value are recorded; if the current processed time is greater than or equal to a preset source counting time, the next step is performed, or frequency-domain beam-forming is re-performed; for any sub frequency unit, the azimuth course in each sub azimuth interval is fitted to remove azimuth outliers, the variance of remaining azimuth is calculated, power corresponding to the remaining azimuth is accumulated, and the variance and the power are taken as information output of the sub frequency unit in the sub azimuth interval; and output information of all the sub frequency units in each sub azimuth interval is fused.

Description

technical field [0001] The invention relates to the field of underwater acoustic signal processing, in particular to a multi-output information fusion method and system based on azimuth history. Background technique [0002] In the application field of underwater acoustic signal processing, the detection of the target is realized by detecting the radiation noise of the target. The conventional method of target radiation noise detection is to use an energy detector, which is a signal detection technology based on broadband energy integration. With the reduction of target radiation noise broadband energy, this method can no longer meet the needs of long-range target detection. Theory and experiments prove that there are abundant single-frequency components in the radiated noise of underwater targets, especially in the low-frequency band. Since the cutting of the water will generate low-frequency signals when the propeller rotates, some of these low-frequency components directl...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects in the prior art that when the position of the line spectrum in the target radiation signal is unknown, it is necessary to judge the output results of each frequency unit, the number of output results is too large, and it is not suitable for practical engineering applications, thereby providing A multi-output information fusion method based on azimuth history, used for a linear array containing multiple primitives, the method includes:

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