双星定位系统增强方案分析

双星导航系统由于卫星数目有限，不能实现实时三维无源定位。为解决我国目前对自主无源三维导航资源的急需，近年来提出了铷钟法、伪卫星法及Loran—C增强法等多种增强方案。通过分析这些方法的工作原理、性能特点、必要性和可行性，将双星系统增强技术的内涵、思路和作用予以展现，并指出各方法的现存问题、解决方案和最具可实现性的发展方向。同时强调了这些增强技术不仅能提供三维无源连续导航资源，而且对未来的第二代导航系统也具有重要的应用价值。

A Review on Augmentation Schemes of Double-Star Navigation System

The Double-Star navigation system in the stand-alone mode cannot accomplish real-time three dimensions passive navigation due to the limited number of satellites.In order to solve the contradiction between the lack of passive 3-D navigation resource controlled by our country and the urgent need for the system,in these years,the rubidium clock method,pseudolite method and Loran-C method are developed as augmentation schemes based on Double-Star.These augmentation approaches' motivation,operational principle and performance is reviewed in details,furthermore,some underlying assumptions,flaws and future challenges are pointed out.It is important to recognize that the augmentation technologies not only can meet the desire of 3-D passive navigation currently,but also have important application merits for future second generation satellite navigation system.