基于带宽优化的载波跟踪算法  

Carrier tracking algorithm based on bandwidth optimization

作　　者：牟伟清[1] 刘荣科[1] 宋青平[1] 段瑞枫[1] 

机构地区：[1]北京航空航天大学电子信息工程学院,北京100191

出　　处：《北京航空航天大学学报》2015年第10期1918-1924,共7页Journal of Beijing University of Aeronautics and Astronautics

基　　金：国家"863"计划(2012AA120602);教育部新世纪优秀人才支持计划(NCET-12-0030);国家自然科学基金重大研究计划(91438116)

摘　　要：在现有的高动态微弱信号的载波跟踪算法中,针对锁频环(FLL)辅助锁相环(PLL)载波跟踪算法,环路调整不连续,易出现跟踪失锁的问题,给出了FLL与PLL的更优组合算法,并确定了组合环路状态转换的过程以及环路状态转换的门限值,从而优化环路性能;针对带宽调整不准确影响环路跟踪性能的问题,分析得出最优带宽值,确定了试探法带宽调整策略,对环路带宽进行实时调整,最终在信噪比为3 d B,且存在加加速度分量时,环路的跟踪误差达到3 Hz左右.In the existing high dynamic weak signal carrier tracking algorithm, frequency locked loops （FLL） auxiliary phase locked loops （PLL） carrier tracking algorithm has the problem that the loop adjusted discontinuously, and easily lost lock. More optimal combination FLL with PLL algorithm and transition process of combination loop were given, threshold for state transition was determined. Aiming at the problem that bandwidth adjustment is not accurate, the optimal PLL loop bandwidth and the bandwidth adjustment strategy were confirmed, the loop bandwidth was adjusted in real-time. In the presence of jerk cases and signal-to- noise ration is 3 dB, the tracking error is around 3 Hz.

关 键 词：高动态 低信噪比 载波跟踪 锁频环 锁相环 

分 类 号：V443.1[航空宇航科学与技术—飞行器设计]