星载蓝绿激光用于水下导航定位的方法探讨

Discussion on Method of Spaceborne Blue-green Laser for Underwater Navigation and Positioning

基于蓝绿激光具有良好透水性以及水下通信可行性基础上,文章提出了一种星载蓝绿激光用于水下定位的方法。设计一个由3颗低轨卫星组成的星座,实现航行器的水下导航定位,并对其定位原理和方法进行了详细说明,分解并分析了影响蓝绿激光水下伪距测量的主要误差源。通过仿真分析表明:3颗星载蓝绿激光卫星可在一个回归周期内同时6次指向指定区域进行观测,在每次卫星过顶时实现最佳目标定位精度。结合各项主要误差影响因素估算出:利用3颗低轨卫星同时采用蓝绿激光水下目标测量,可实现水下航行器定位精度优于百米量级。

With the development of laser technology,the applications of blue-green laser in underwater communication have been widely studied and the feasibility has been verified by experiments.Based on the above advantages,a method of spaceborne blue-green laser in underwater positioning is proposed,a low orbit satellite constellation composed of three satellites is designed,through which navigation and positioning are realized.In this paper the principle and method of positioning are described in detail,moreover,the main error sources affecting the pseudo-range measurement are analyzed.From the simulated results:three satellites of spaceborne blue-green laser can observe the same assigned region time for 6 times in a recursive period.The best positioning accuracy is acquired at the zenith-passing time of satellite,combined with the main error factors to estimate that:three satellites of spaceborne blue-green laser are used for underwater target observation,the accuracy can be better than 100 meters.