【摘要】 针对高速目标速度、加速度、幅度起伏导致的回波积累能量扩散问题,基于回波模型,研究了目标参数、雷达参数对回波积累效能的影响.通过建立回波包络以及频率走动与分辨率的数学表征,分析了走动项对目标分辨率以及积累能量的影响规律,获得了距离走动、多普勒走动与信号积累增益变化的定量关系.研究结果表明:当距离或频率走动大于2个分辨单元时,积累能量信噪比下降2dB.同时,分析了目标在不同幅度起伏模型情况下,相参积累能量的变化情况,结果表明,慢起伏比快起伏造成的能量损失大,这类目标不适合进行长时间的相参积累.更多还原

【Abstract】 Aiming at the problem of echo accumulation and energy diffusion caused by the velocity,acceleration and amplitude fluctuation of high-speed targets,the influence of target parameters and radar parameters on echo accumulation efficiency is studied based on echo model.By establishing the mathematical model of echo envelope,frequency walk and resolution,we analyzed the influence rule of moving objects on target resolution and accumulated energy,and got the quantitative relationship between distance walk,Doppler walk and signal accumulation gain.The results show that when the distance walk is larger than 2 resolution units,the accumulated energy SNR decreases by 2 dB.And,a similar analysis is done to the Doppler frequency.At the same time,we analyze the change of coherent accumulation energy under different amplitude fluctuation models.The results show that the energy loss caused by slow fluctuation is greater than fast fluctuation,and this kind of target is not suitable for long time coherent accumulation.更多还原