机载SAR成像运动补偿中陀螺仪量化误差影响  

Research on Influence of Gyroscope Quantization Noise on Motion Compensation of Airborne SAR

作　　者：孙国雯[1,2,3] 梁兴东[1,2] 

机构地区：[1]中国科学院电子学研究所,北京100190 [2]微波成像技术国家级重点实验室,北京100190 [3]中国科学院研究生院,北京100190

出　　处：《科学技术与工程》2011年第17期4069-4075,4079,共8页Science Technology and Engineering

基　　金：国家‘863'计划(2007AA120303)资助

摘　　要：在机载SAR运动补偿中陀螺仪的脉冲计数量化噪声是IMU解算误差的影响因素之一,不合理的脉冲当量值会对后续运补造成一定的影响。通过建立陀螺仪的量化噪声模型,从理论上推导了量化噪声经惯性解算后的统计分布,并通过成像仿真分析了量化噪声对不同波段SAR成像分辨率、峰值旁瓣比和积分旁瓣比的影响。仿真结果表明量级为10~1～10~0角秒/脉冲的陀螺仪脉冲当量可以满足SAR成像指标要求,从而可以作为平均意义上SAR系统的最优选择。In the motion compensation of airborne SAR system,gyroscope quantization noise of pulse counting is one of the factors resulting in inertial measurement unit（IMU） error.Improper minimum pulse count unit affects the subsequent motion compensation.By modeling gyroscope quantization noise,The corresponding statistical distribution after inertial resolution is deduced theoretically.At the same time,the above influence on multi-frequency SAR imaging resolution are analyzed,PSLR and ISLR.The simulation result shows that pulse equivalent on the order of 10~1 to 10~0 arc-second/pulse could sufficiently meet the requirement of SAR imaging and such range of pulse equivalent could be selected to achieve good performance of SAR system.

关 键 词：合成孔径雷达 运动补偿 惯性测量 量化噪声 

分 类 号：TN951[电子电信—信号与信息处理]