利用已知参考点的RTK系统延迟二步估计法  

Two-step method for estimating the RTK system delay using known reference point

作　　者：李杨寰[1] 王建[1] 金添[1] 周智敏[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：《测绘科学》2010年第1期77-79,共3页Science of Surveying and Mapping

摘　　要：RTK系统应用于SAR成像中时,由于方位采集和雷达系统回波采集的时间不同步,需要对RTK延迟进行估计,本文首先对RTK的延迟误差进行了分析,将其划分为固定延迟和随机延迟两部分。然后本文给出了一种实际可行的延迟估计方法,该方法利用已知参考点的位置信息对回波进行积累,快速估计固定延迟,在固定延迟的估计结果上,通过比较图像的积分旁瓣比(ISLR),对随机延迟进行二次估计。最后通过仿真和实测结果验证了该方法的有效性。The position sampling and echo sampling system are not synchronized, when the RTK is used in the Synthetic Aperture Radar imaging process. The delay error of RTK system is also analyzed, which is divided into a fixed delay and a random delay. In this paper a practical method used for estimating this delay is presented. It makes use of the position information of the known reference point to accumulate the echoes and get the fixed delay quickly. Within the result, further random delay is estimated by comparing the image＇ s ISLR. Finally the validity of this method is proved by simulation and real data.

关 键 词：RTK系统 延迟估计 运动补偿 时间配准 后向投影算法 

分 类 号：P228[天文地球—大地测量学与测量工程]