Abstract: In the current context of the booming aerospace field,starlink satellites,as large-scale non-cooperative targets,their orbit management and precise monitoring are of great significance.This paper takes thousands of starlink non-cooperative target satellites as the research object and deeply explores the effective methods for generating two-line element(TLE)for navigation using starlink ephemeris data.By comparing and analyzing the downloaded TLE data of starlink satellites,it is found that the existing TLE has deficiencies in accuracy in navigation applications.Therefore,an orbit model is established based on the least-squares method.High-precision TLE is obtained through collecting ephemeris data,defining the error function,calculating the Jacobian matrix,solving the normal equation,and iterative updating.The research clearly shows that factors such as data duration,frequency,and the time interval between the ephemeris and TLE generation moments have a significant impact on TLE accuracy.The research results have broad application prospects in fields such as satellite navigation,collision warning,and spacecraft cooperative operations,and will strongly promote the development and practical application of orbit management and navigation technologies for non-cooperative target satellites.

Key words: non-cooperative targets, navigation, starlink satellites, two-line element, orbit prediction