机载脉冲多普勒雷达基于K分布的海杂波仿真

Airborne PD Radar’s Sea Clutter Emulation Based on K Distribution

机载雷达对海探测过程中目标回波会伴随着大量的海杂波,对海杂波进行仿真有助于提升雷达海杂波抑制能力。海杂波的幅度在时间和空间上随机起伏,并且存在一定的相关性。为逼真地模拟海杂波的特性,采用K分布模型实现了海杂波幅度起伏特性的模拟,采用立方功率谱实现了海杂波相关特性的模拟,并考虑了海浪运动和雷达平台运动引起的多普勒效应。仿真结果表明,该模型能够较好反应机载脉冲多普勒雷达海杂波幅度的起伏特性和时间相关性。

When airborne radar radiates to the sea, targets’ echoes follow with sea clutter of much more power, and the work of sea clutter emulation does much help to the suppress of sea clutter. Sea clutter’s intensity is stochastically changing in time and space with some relativity. In order to simulate sea clutter’s characteristic simulation, K distribution is selected to achieve the simulation of sea clutter’s intensity’s fluctuant characteristic, while cubic power spectrum is selected to carry out relativity characteristic simulation with Doppler frequency effect introduced by wave and platform moving. Emulation result shows that the built model could reflect fluctuant characteristic and relativity characteristic of sea clutter perfectly.