舰船雷达超视距探测中的定位方法研究

Research on the Localization Method of the Ship Radar in Over-the-Horizon Detection

蒸发波导是海洋大气环境中出现概率最高的一种大气波导,当舰船雷达工作在蒸发波导环境下时,在一定的条件下雷达电波被陷获在蒸发波导内传播,如果采用雷达常用的定位方法就会产生很大的定位误差。根据电波传播理论和蒸发波导特征,基于射线追踪技术,提出了蒸发波导环境中舰船雷达电波传播路径的计算方法和雷达对目标的精确定位方法。仿真结果表明,满足蒸发波导传播条件情况下,舰船雷达采用常用方法对目标定位时在水平方向的误差较小,在垂直方向上的误差很大。采用蒸发波导环境下的舰船雷达定位方法可以实现在蒸发波导条件下对目标精确定位,从而提高舰船雷达的作用效果和精度。

Evaporation duct is one kind of the atmospheric ducts which has the highest probability in the marine atmosphere environment. The radar wave propagation is trapped in the evaporation duct in certain conditions. When the warship-radar works in evaporation duct environments and it may generate a great positioning error by adopting the common radar localization method. According to the propagation .theory of radio wave and the characteristic of evaporation duct, and based on ray tracing technology, we propose the calculation method of propagation paths of radar wave under the evaporation duct environments and precise localization method. Simulation results indicate that the error is smaller in the horizontal direction but is bigger in the vertical direction by adopting common methods, in the case of meeting the propagation conditions in evaporation duct. The precise positioning of the target in the evaporation duct can be achieved by applying the localization method of the warship-radar, thus to improve the effects and precision of warship-radar.