机载前视风切变雷达杂波抑制的仿真研究

摘要

To weaken the influence of ground clutter on the detection of windshear echo, clutter suppression method of normalized least square lattice (ISL) joint process estimator is presented, whose reflection and regression coefficients can be adjusted adaptively in terms of smallest sum-of-squares of the output, to make sure that the output clutter is small to benefit the windshear detection, thus to ensure the flight safety. Simulation results show that the clutter suppression method of normalized LSL joint process estimator can track the Doppler frequency of the main lobe clutter in low signal-to-clutter ratio situation, and it has a good ground interference inhibiting ability compared with AMTI, and can satisfy the clutter suppression demand of airborne forward-looking windshear radar.%研究飞机起飞和着陆的安全问题,大气中的切变风影响飞机的飞行安全.为减弱地杂波对风切变同波信号检测,应对雷达回波进行杂波抑制,提取切变风信号,达到准确预警.为达到上述目的,提出一种归一化最小二乘格形(least square lattice,LSL)联合过程估i计器杂波抑制方法,利用估计器输出的平方和最小的前提下,自适应地凋整估计器的反射系数及回归系数,使输出杂波成分最小,从而有利于风切变的检测,以保证飞行安全.仿真结果表明,归一化LSL联合过程估计器在甚低信杂比情况下,可以主动跟踪主瓣杂波的多普勒频率,相对于AMTI杂波抑制技术具有更好的抑制能力,满足机载前视风切变雷达达到准确预警的目的.