参数估计误差对光纤水听器PGC反正切解调性能的影响  

Influence of parameter estimation error on demodulation performance of PGC arctangent algorithm in optical fiber hydrophone

作　　者：王凯[1] 施清平[2,3] 蒋佳佳[1] 戴之光[2] 田长栋[2] 段发阶[1] 张敏[2] 廖延彪[2] 

机构地区：[1]天津大学精密测试技术及仪器国家重点实验室,天津300072 [2]清华大学集成光电子学国家重点实验室,北京100084 [3]北京宇航系统工程研究所,北京100076

出　　处：《光电子．激光》2012年第10期1856-1862,共7页Journal of Optoelectronics·Laser

基　　金：国家"863"计划(2006AA0AA102-03)资助项目

摘　　要：针对相位生成载波(PGC)方法用于实际光纤水听器解调系统时利用反正切算法解调时导致的失真,本文用同频相对幅度误差(RAE)以及谐波抑制比(HSR)分别表征解调系统线性和非线性失真。通过引入带有参数估计误差的反正切补偿模型,建立了上述失真与系统关键参数及其误差的定量的数学关系。仿真和实验验证了本文方法的正确性。Phase generated carrier（PGC） method needs to be compensated when it is used in the actual demodulation system of optical fiber hydrophone.Parameter measurement error can induce an incomplete compensation effect on the arctangent demodulation model.Thus the arctangent algorithm based on the model produces distortion.The relative amplitude error（RAE） and harmonic suppression ratio（HSR） are considered in this paper,which indicate a linear distortion and a nonlinear one,respectively.The arctangent demodulation model with parameter estimation error is proposed.The quantitative relations between parameter measurement errors and demodulation distortions,such as RAE and HSR,are built up in theory.Finally,experimental results as well as simulations are presented to verify the proposed theory.

关 键 词：光纤水听器 相位生成载波(PGC) 反正切解调算法 参数估计 相对幅度误差(RAE) 谐波抑制比(HSR) 

分 类 号：TN76[电子电信—电路与系统]