jgg     2014 34 (3):  111-115    ISSN: 0412-1961  CN: 21-1139/TG STUDY ON AUTONOMOUS ORBIT DETERMINATION OF NAVIGATION  CONSTELLATION WITH DISTRIBUTION ALGORITHM BASED ON  GROUND-BASED ANCHORS 1)61892 Troops of PLA，Shantou 515071 2)College of Aerospace Science and Engineering，National University of Defense Technology， Changsha 410072 Received: 2013-07-24  Revised: null  Online: 2014-05-28 Supporting info