基于目标辐射噪声的信号起伏检测算法研究

The Signal Fluctuating Detection Algorithm Based on the Target Radiated Noise

该文以起伏声场背景下的目标辐射噪声模型分析为前提,针对目标方位估计和窄带线谱的检测问题,提出一种基于信号起伏相位差分对齐的宽窄带综合相干检测算法。利用周期线谱信号与宽带噪声间的时间相关半径与起伏相位均匀性差异,抑制背景噪声的能量干扰;将聚焦波束域输出信号的起伏相位对齐增益结合阵元域处理的空间相干增益,提高对不同来波方向目标的辨识能力。通过仿真分析与海试实验结果验证了该文所提算法可明显增强目标线谱分量的检测信噪比增益和相关目标所在波束方位的相对能量谱级,在抗复杂信道检测、识别领域具有良好的实际应用前景。

The analysis of the target radiated noise model is made as a precondition under the background of fluctuating sound field firstly. A broad and narrow band integrated coherent detection algorithm based on phase fluctuation and differential alignment is proposed for the issue of target azimuth estimation and narrow-band line-spectrum detection. The background noise energy disturbances can be restrained by using the differences of temporal correlated radius and phase fluctuation uniformity for the periodic spectrum signals and broadband noise; The ability to identify different DOA targets can also be improved by combining phase fluctuation aligned gain of the output signal in focused beam domain and spatial coherent gain of the signal processing in array domain. It is proved that the proposed algorithm can significantly enhance the detection SNR gain of the target line spectral component and relative energy spectrum level of the coherent target＇s beam azimuth by analyzing the simulation and sea experiment results. It has better application prospects in the detection and identification areas of anti-complex channel.