机载SAR成像运补中陀螺仪量化误差影响研究

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。论文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 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。

Research on influence of gyroscope quantization noise on motion compensation of airborne SAR

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, this paper theoretically deduces the corresponding statistical distribution after inertial resolution. At the same time, this paper analyzes the above influence on multi-frequency SAR imaging resolution, PSLR and ISLR. The simulation result shows that pulse equivalent on the order of to 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.