CAJ | 학술논문

针对星间链路信号动态范围大、捕获时间要求短之间的矛盾，提出了一种捕获初始信息的求解算法。该算法基于导航星座的星历资源和动态特性，采用迭代的方法对信号传输时延和多普勒频率进行估计。分析指出，该算法实现过程简单，收敛速度快，估计精度高，两次迭代即可实现时延估计精度达到纳秒级，大大降低了捕获实现的难度和复杂度，适合星上资源要求比较严格的场合。分析基于北斗导航星座模型展开，对我国北斗导航星间链路的设计提供了参考。
침대성간련로신호동태범위대、포획시간요구단지간적모순，제출료일충포획초시신식적구해산법。해산법기우도항성좌적성력자원화동태특성，채용질대적방법대신호전수시연화다보륵빈솔진행고계。분석지출，해산법실현과정간단，수렴속도쾌，고계정도고，량차질대즉가실현시연고계정도체도납초급，대대강저료포획실현적난도화복잡도，괄합성상자원요구비교엄격적장합。분석기우북두도항성좌모형전개，대아국북두도항성간련로적설계제공료삼고。
In view of the large dynamic and fast acquisition requirement of inter-satellite links (ISLs)signal,a capture initial information solution method is presented for ISLs of navigation constellation.This method evaluates time-delay and Doppler frequency based on ephemeris.The analysis shows that this method has a simple realization process,a high speed of restraining and a high precision of evaluation,and can achieve the degree of nanosecond for the time delay through merely two times of iteration,which has greatly reduced the computing difficulty and complexity. This analysis is made upon the model of BeiDou navigation system and can provide reference for our country’s ISLs design.