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。首先提出了一种基于惯导信息和雷达导引头观测信息的海面目标航态特征提取方法，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？

Chapter angle reflection Navigation State feature extraction and identify the problem. First proposed an observation information based inertial navigation information and radar seeker the sea targets Navigation State feature extraction method to get the position of the surface target under the earth

CHAPTER 4 studies the corner reflector, the State feature extraction and identification. The first one is based on habitual export information and radar observation information guide and the sea state target aircraft feature extraction method, the surface target Earth coordinate system in the locati

Fourth chapter has studied the angular reflector navigation condition characteristic extraction and the distinction question.First proposed one kind based on the inertial guidance information and the radar seeker observation information sea level goal navigation condition characteristic extraction m

Fourth chapter examines corner Reflector navigation State feature extraction and identification of problems. First introduced a radar seeker and inertial navigation information based sea target routes-State feature extraction method of observation information, to which sea target in Earth coordinate