浅海脉冲噪声环境下基于水平线阵的航速估计仿真研究

Research and Simulation on Speed Estimation Based on Horizontal Linear Array in Shallow Sea Impulsive Noise Environment

针对浅海脉冲噪声低混合信噪比条件下的运动目标航速估计问题,提出基于水平线阵的航速估计方法。首先,给出一种改进的常规波束形成方法,能够抑制脉冲噪声,且输出的信号不影响后续时频分析;然后提取波束信号的离散谱分量,估计单根离散线谱的多普勒频率;再利用多普勒频移和航速的关系,通过最小二乘求解出目标航速。仿真结果表明,该方法可在脉冲噪声低混合信噪比环境下精确估计目标航速。

In order to solve the speed estimation of moving target under low mixed signal-to-noise ratio in shallow water impulsive noise environment,a method based on horizontal linear array is proposed.First,a modified conventional beam forming method is proposed,which can suppress impulse noise,and the output signal does not affect the subsequent time-frequency analysis.Then the discrete spectrum component of the beam signal is extracted and the Doppler frequency is estimated.On this basis,the relationship between Doppler frequency shift and speed is used to estimate the target speed by least square.The simulation results show that the proposed method can accurately estimate the target speed under low mixed signal-to-noise ratio in shallow water impulsive noise environment.