Methods By Combining signals of frame angle and the rate of line of sight, a kind of integral proportional navigation was obtained.

方法将框架角信号和视线角速度信号进行综合，形成一种积分比例导引规律；

youdao

Then, navigation system observability and observable degree with different quantitative line-of-sight measurements are analyzed in detail by rank analysis of the error variance inverse matrix.

然后，通过对误差方差阵逆矩阵秩的分析，比较详尽地分析了不同数量视线观测条件下导航算法的可观度和可观性。

youdao

Homing pigeons can travel from up to 400 miles away in a single day - using magnetic fields as well as sight for navigation.

BBC: Racing pigeon losses baffle fanciers