激光与红外
激光與紅外
격광여홍외
LASER & INFRARED
2014年
7期
824-828
,共5页
信号采样%采样时钟抖动%信号检测%信噪比%取样积分
信號採樣%採樣時鐘抖動%信號檢測%信譟比%取樣積分
신호채양%채양시종두동%신호검측%신조비%취양적분
signal sampling%sampling clock jitter%signal detection%SNR%sampling integral
信号采样是弱光信号检测的关键技术环节，由于采样时钟抖动引起的采样信号的输出误差会影响后续的信号检测和处理。为此，分析了输入光信号为近高斯分布波形时由时钟抖动引起的采样误差，推导出了采样输出的信噪比损失公式，讨论了采样带宽、输入信噪比以及信号脉宽对输出信噪比损失的影响，最后以取样积分检测技术为对象，计算了在不同累积次数的条件下采样抖动对取样积分检测性能的影响，对弱光信号检测中的采样时钟选取具有一定的指导意义。
信號採樣是弱光信號檢測的關鍵技術環節，由于採樣時鐘抖動引起的採樣信號的輸齣誤差會影響後續的信號檢測和處理。為此，分析瞭輸入光信號為近高斯分佈波形時由時鐘抖動引起的採樣誤差，推導齣瞭採樣輸齣的信譟比損失公式，討論瞭採樣帶寬、輸入信譟比以及信號脈寬對輸齣信譟比損失的影響，最後以取樣積分檢測技術為對象，計算瞭在不同纍積次數的條件下採樣抖動對取樣積分檢測性能的影響，對弱光信號檢測中的採樣時鐘選取具有一定的指導意義。
신호채양시약광신호검측적관건기술배절，유우채양시종두동인기적채양신호적수출오차회영향후속적신호검측화처리。위차，분석료수입광신호위근고사분포파형시유시종두동인기적채양오차，추도출료채양수출적신조비손실공식，토론료채양대관、수입신조비이급신호맥관대수출신조비손실적영향，최후이취양적분검측기술위대상，계산료재불동루적차수적조건하채양두동대취양적분검측성능적영향，대약광신호검측중적채양시종선취구유일정적지도의의。
Sampling is the key technology of the weak optical signal detection. However,the sampling output signal er-ror due to the sampling clock jitter will affect the signal detection and processing. Therefore,the sampling error due to the clock jitter is analyzed when the input signal is the Gauss distribution. Accordingly,the loss of the sampling output signal-to-noise (SNR)is obtained,and the influence of the sampling bandwidth,input SNR and the signal duration on the loss of the output SNR is discussed. In the end,the effect of sampling jitter on the sampling integral detection probability is calculated with different accumulation number,which provides the guidance for the select of sampling clock in the weaken optical signal detection.
