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从星载合成孔径雷达 (SAR)天线指向不稳定对成像质量影响的角度研究天线指向稳定度 .对均匀加权天线 ,详细推导了天线指向不稳定引起的成对回波的位置和幅度 ,分析了成对回波对点目标冲激响应的峰值旁瓣比、积分旁瓣比的影响 .研究了天线指向不稳定造成的多普勒中心频率误差 ,根据多普勒中心频率误差与图像位置偏移的关系 ,给出了图像质量对天线指向稳定度的要求 .最后进行了计算机仿真 ,验证了分析结果 .
The stability of the antenna is studied from the perspective of the instability of the spaceborne synthetic aperture radar (SAR) antenna pointing to the imaging quality.For the uniformly weighted antenna, the position and amplitude of the paired echoes caused by the instability of the antenna are deduced in detail. The effect of paired echoes on the peak sidelobe ratio and the integral sidelobe ratio of the impulse response of the point target.The error of the center of the Doppler frequency caused by the instability of the antenna is studied.According to the error of the Doppler center frequency and the image position shift The relationship between the image quality and the pointing stability of the antenna is given.Finally, a computer simulation is carried out to verify the analysis results.