中国新通信
中國新通信
중국신통신
CHINA NEW TELECOMMUNICATIONS
2015年
1期
102-103
,共2页
北斗信号%频率同步%高噪声%多周期积累
北鬥信號%頻率同步%高譟聲%多週期積纍
북두신호%빈솔동보%고조성%다주기적루
signal of CNSS%frequency synchronization%strong noise%Multi period accumulation
针对基于北斗信号的星载双站SAR成像频率同步误差，提出一种在高噪声情况下新的频率同步方法。以北斗卫星直达波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，在码同步后使用已知时延的多周期积累的时频捕获算法获到频率误差。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。
針對基于北鬥信號的星載雙站SAR成像頻率同步誤差，提齣一種在高譟聲情況下新的頻率同步方法。以北鬥衛星直達波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，在碼同步後使用已知時延的多週期積纍的時頻捕穫算法穫到頻率誤差。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。
침대기우북두신호적성재쌍참SAR성상빈솔동보오차，제출일충재고조성정황하신적빈솔동보방법。이북두위성직체파신호위동보신호원건립동보통도，사용단주기적루적확빈신호우화시빈포획산법득도교정학위마시연，재마동보후사용이지시연적다주기적루적시빈포획산법획도빈솔오차。련속10차계산궤방진재SNR=-50db적고조성배경하빈솔오차균불초과1.5Hz。
In view of the frequency synchronization error to the star-star bistatic SAR imaging with signal of COMPASS Navigation Satel ite System (CNSS), a novel frequency synchronization method for strong noise environment was presented. A synchronizing channel was constructed with the direct wave of CNSS 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 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.
