UWB SAR实时PRF调整  

Real Time Adjustment of PRF in UWB SAR

作　　者：李建阳[1] 常文革[1] 李悦丽[1] 

机构地区：[1]国防科技大学电子科学与工程学院,长沙410073

出　　处：《现代雷达》2009年第4期34-37,共4页Modern Radar

摘　　要：在超宽带合成孔径雷达(UWB SAR)实时成像中,载机沿航向前向速度误差的影响主要是通过实时调整脉冲重复频率(PRF)来消除的,相对于高波段数据,在相同分辨率条件下,UWB SAR数据对载机前向速度的变化要敏感得多。文中分析了UWB SAR实时PRF调整中的3个因素:方位聚焦的要求、硬件调整PRF的精度以及惯导测量精度,得出UWBSAR中PRF调整的精度主要由惯导的测量精度决定。仿真数据分析了UWB SAR实时PRF调整对成像质量的影响以及研究结论的有效性。The aircraft forward velocity variation can be compensated by adjusting Pulse Repetition Frequency （PRF） in real-time Ultra-wide Band （UWB） SAR imaging. Compared with high frequency SAR, UWB SAR is more sensitive to the variation of air- craft forward velocity. In this paper, we analyze three factors affecting adjustment of PRF in real time： the focusing requirement in azimuth, the precision of PRF adjustment and the precision of Inertial Navigation System （INS）. The conclusion is that the preci- sion of PRF adjustment is mainly determined by INS. At last, simulation data are used to demonstrate the effect of PRF adjustment in SAR imaging and to verify our conclusion.

关 键 词：超宽带合成孔径雷达 航向速度 多普勒调频率 惯导 脉冲重复频率 

分 类 号：TN958[电子电信—信号与信息处理]