谱校正技术在水下信号波达方向估计中的应用

DOA estimation for underwater signal based on spectrum correction technology

针对具有不稳定强线谱特征的水下目标,提出了一种基于目标线谱校正技术的信号波达方向估计(Direction ofArrival,DOA)方法,该方法结合矩形窗谱校正技术和全相位修正方法对目标线谱参数进行估计,从而计算目标方位。对该技术进行了仿真研究,并应用于实际水下目标线谱方位估计和单频脉冲波(CW波)的DOA估计中。通过对线列阵多个阵元检测到的同一线谱信号的频率和相位差进行修正,准确计算出入射信号的到达方位角。计算结果表明,该技术在小孔径基阵目标方位被动估计和CW波的波达方向估计等方面应用效果较好。

Aimed at underwater targets with unstable line spectrum,this paper discusses a DOA（Direction of Arrival） estimation method for underwater signal based on line spectrum correction technology.By correcting the frequency and phase of the signal with the same line spectrum,which is detected by a multi-elements line array,the DOA of the incident signal is accurately calculated.The results indicate that this technology has a good prospect of application in the DOA estimation of underwater target and CW wave source with small aperture array.