中国新通信
中國新通信
중국신통신
China New Telecommunications
2015年
23期
34-35
,共2页
扩频信号%频率同步%高噪声
擴頻信號%頻率同步%高譟聲
확빈신호%빈솔동보%고조성
spread spectrum signal%frequency synchronization%strong noise
针对有噪声时扩频信号捕获中的频率同步的误差大，提出一种在高噪声情况下改进的频率同步方法。以扩频信号为同步信号源建立同步通道，使用单周期积累的扩频信号优化时频捕获算法得到较精确伪码时延，在码同步后进行多周期积累的时频捕获算法获实现更高精度的频率同步。连续10次计算机仿真在SNR=-50db的高噪声环境下频率误差均不超过1.5Hz。
針對有譟聲時擴頻信號捕穫中的頻率同步的誤差大，提齣一種在高譟聲情況下改進的頻率同步方法。以擴頻信號為同步信號源建立同步通道，使用單週期積纍的擴頻信號優化時頻捕穫算法得到較精確偽碼時延，在碼同步後進行多週期積纍的時頻捕穫算法穫實現更高精度的頻率同步。連續10次計算機倣真在SNR=-50db的高譟聲環境下頻率誤差均不超過1.5Hz。
침대유조성시확빈신호포획중적빈솔동보적오차대，제출일충재고조성정황하개진적빈솔동보방법。이확빈신호위동보신호원건립동보통도，사용단주기적루적확빈신호우화시빈포획산법득도교정학위마시연，재마동보후진행다주기적루적시빈포획산법획실현경고정도적빈솔동보。련속10차계산궤방진재SNR=-50db적고조성배경하빈솔오차균불초과1.5Hz。
In view of the frequency synchronization error to the spread spectrum signal, an improved frequency synchronization method for strong noise environment was presented. Asynchronizing channel was constructed with t spread spectrum signal as the signal source for synchronization.The high accuracy pseudo-random code delay can be got by capture algorithm of the time-frequency optimization in single period .then, base on the synchronization of pseudo-random code , the higher accuracy of frequency synchronization error can be got by capture algorithm of the time-frequency with Multi period accumulation. The frequency synchronization errors are less than 1.5Hz in 10 computer simulations with strong noise as SNR=-50db.
