第三章以PHI为代表介绍了线阵推扫式成像光谱仪的结构和工作原理，然后对PHI图像的几何校正方法进行描述。
Third chapter: introducing the structure and work principle of push-broom scan imager with PHI; introducing the method of PHI image's geometric correction.
针对更一般的情形，利用压缩映象原理，给出了蛛网模型的稳定性条件，取消了通常的线性假设，同时提供了“蛛网”的一种简洁的几何描述。
With the use of the shrinked-map principle, we obtain a more general condition of the stability in cobweb model, where the usually cited linear hypothesis is canceled.
详细描述了非线性控制理论几何结构原理的精确线性化算法的过程。
In all details, this paper introduces the algorithmic procedure on the geometric structure principium of nonlinear control theory.
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