导航星座星间链路信号自适应捕获方法  

Adaptive acquisition algorithm for inter-satellite links in navigation constellation

作　　者：李献斌[1] 王跃科[1] 周永彬[1] 

机构地区：[1]国防科学技术大学机电工程与自动化学院,湖南长沙410073

出　　处：《系统工程与电子技术》2015年第1期12-16,共5页Systems Engineering and Electronics

基　　金：国家高技术研究发展计划(863计划)(2012AA121804)资助课题

摘　　要：针对导航星座星间链路信号动态特性和工作特点,提出了一种基于星历辅助的自适应捕获方法。该方法利用导航卫星自有的导航电文对接收信号到达时延、多普勒频移和信噪比进行估计,根据估计结果自适应调整信号捕获的搜索范围、非相干累加次数和判决门限,以减少捕获时间、提高捕获性能。给出了自适应捕获的设计思路和流程,并结合全球定位系统真实轨道数据进行了仿真。仿真结果进一步证明了所提方法的有效性。In view of the signal dynamic characteristics and working mechanism of inter-satellite links in navigation constellation,an adaptive acquisition algorithm assisted by the navigation data is introduced.The proposed method makes use of the navigation data to calculate the time-delay,Doppler frequency and signal to noise ratio of the received signal.Based on the results,the search area,non-coherent times and threshold of sig-nal acquisition are adjusted adaptively to reduce acquisition time while improving acquisition performance.Final-ly,the effectiveness of the proposed algorithm is proved by the real orbit data of the global positioning system.

关 键 词：导航星座 星间链路 自适应 捕获 导航电文 

分 类 号：V448[航空宇航科学与技术—飞行器设计]