给出了一个形式简洁的方位随时间线性变化的可量测函数，并利用工作点漂移的技术解决了滤波器在方位小变化量时系统的不稳定现象。
In this paper, a linear function of bearing variation versus time is given, and the method of work-point drifting are used to solve filter system which is unstable in bearing small change.
研究结果表明，采用SIFT算法提取特征点实现基于普通非量测相机无人机遥感系统获取的影像快速自动拼接在技术上是可行的，满足减灾救灾工作的突发性要求。
The results of this study show that it is feasible for image rapid automatic stitching by SIFT key point extraction. It also meets the disaster reduction and relief requirements.
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