针对飞行器前视红外视觉导航技术中导航区选取这个关键问题，提出一种实用的连续跟踪导航区选取方法。首先对前视红外视觉导航任务进行了分析，总结了常用的4种导航模式；然后针对连续跟踪导航任务，通过图像方差计算、连续直线特征检测、Frieden灰度熵分析，设计了一种粗选、精选与稳定性分析相结合的导航区选取方法，给出了方法的基本原理、实现步骤及选取流程图；最后结合典型场景图像数据进行了仿真实验，验证分析了该方法在连续跟踪导航区选取上的有效性、实用性及适应性。

An approach for the selecting continuous tracking navigation area was proposed to solve the problem of navigation area selecting for FLIR visual navigation of air vehicles.The mission of FLIR visual navigation was analyzed,and 4 kinds of commonly used navigation modes were summarized.Then,a navigation area selecting method integrating rough selecting,accurate selecting with stability analysis was designed as for the mission of continuous tracking navigation area selection,based on image variance calculation,continuation straight line feature detection and Frieden gray level entropy.The basic principle,implementation steps and flow chart are given here.The application experiments indicate the practicability,efficiency and adaptability of the designed approach.