求翻译：第四章研究了角反射器的航态特征提取与鉴别问题。首先提出了一种利用惯导信息和雷达导引头观测信息的海面目标航态特征估计方法，得到了海面目标在大地坐标系下的位置、航向和航速，仿真实验和外场试验表明，本文方法计算量少，估计精度高，为后文利用目标航态信息实现角反射体鉴别奠定了基础。是什么意思？

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CHAPTER 4 studies the corner reflector, the State feature extraction and identification. First use a usual import information and radar observation information guide and the sea air target state characteristics estimates by the sea, in the coordinate system of the earth location, course and speed, t

Fourth chapter has studied the angular reflector navigation condition characteristic extraction and the distinction question.First proposed one kind of use inertial guidance information and the radar seeker observation information sea level goal navigation condition characteristic estimate method, o

Fourth chapter examines corner Reflector navigation State feature extraction and identification of problems. Pioneered a radar seeker and inertial navigation information China Sea target State estimation method of observation information, to which sea target in Earth coordinates of the position, cou

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