CAJ | 학술논문

广播星历参数是卫星导航电文的重要内容,一般通过对精密星历进行参数拟合得到,广播星历参数的拟合大多采用基于开普勒根数形式的广播星历参数拟合算法,研究表明,该方法在小偏心率轨道情形下,拟合精度较差。文章给出了基于第一类无奇点变量形式的广播星历参数拟合算法,仿真结果表明,采用第一类无奇点变量,可以有效解决小偏心率引起的拟合精度损失问题,拟合精度可达毫米级;此外,讨论了小倾角情况下算法的适应性,仿真结果表明,基于第一类无奇点变量的广播星历参数的拟合算法不能很好地适应小倾角情况;最后,对导航电文的外推能力进行了分析,并结合自主导航实际工程应用给出了自主导航电文拟合弧段长度为2h,更新频率为15min的初步设想。
엄파성력삼수시위성도항전문적중요내용,일반통과대정밀성력진행삼수의합득도,엄파성력삼수적의합대다채용기우개보륵근수형식적엄파성력삼수의합산법,연구표명,해방법재소편심솔궤도정형하,의합정도교차。문장급출료기우제일류무기점변량형식적엄파성력삼수의합산법,방진결과표명,채용제일류무기점변량,가이유효해결소편심솔인기적의합정도손실문제,의합정도가체호미급;차외,토론료소경각정황하산법적괄응성,방진결과표명,기우제일류무기점변량적엄파성력삼수적의합산법불능흔호지괄응소경각정황;최후,대도항전문적외추능력진행료분석,병결합자주도항실제공정응용급출료자주도항전문의합호단장도위2h,경신빈솔위15min적초보설상。
Broadcast ephemeris parameters are an important part of the navigation message,and usually can be obtained by parameter fitting the precise ephemeris.Most scholars adopt broadcast ephemeris parameters fitting algorithm based on Kepler elements,but research shows that the fitting accuracy of this method is poor in the case of small eccentricity.This paper gives broadcast ephemeris parameters fitting algorithm based on the first class of no singularity variables.The simulation shows that the algorithm can effectively avert the fitting accuracy loss caused by small eccentricity,fitting accuracy can reach millimeters;In addition,this paper discusses the adaptability of the algorithm in the case of small inclination,the simulation shows that the fitting algorithm is not suitable for small inclination.In the end,combining with the engineering application of autonomous navigation,this paper analyzes the extrapolation capability of navigation data and gives an initial scheme in which the fitting arc length of autonomous navigation data is for 2 hours,and the update interval is 15 minutes.