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提出一种不依赖于机载主惯导的 SAR运动信息传感器方案 ,即改进的基于 GNSS/ SINS组合运动系统。在成像期间 ,输出以纯惯性为主的导航信号 ,以保证较高的相对定位精度。而 GNSS/ SINS组合 ,则保证了长时间的绝对定位精度。本文介绍了这种运动传感器的原理和数学模型等 ,并对实验结果作了分析。多次实验表明 ,本文提出的基于 GNSS/ SINS的运动传感器具有很高的精度 ,完全满足了 SAR成像的精度要求 ,特别适用于没有主惯导或主惯导精度较低的场合
A scheme of SAR motion information sensor that does not depend on the main carrier of airborne navigation is proposed, which is an improved GNSS / SINS combined motion system. During imaging, the output of the purely inertial navigation signal to ensure a high relative positioning accuracy. The GNSS / SINS combination guarantees a long time absolute positioning accuracy. This paper introduces the principle and mathematical model of this kind of motion sensor, and analyzes the experimental results. Several experiments show that the GNSS / SINS-based motion sensor proposed in this paper has high precision and fully meets the requirements of SAR imaging accuracy, especially for applications where there is no main guide or the main inertial navigation is less accurate