TY - GEN
T1 - The influence of parameters measurement error on demodulation performance of PGC arctangent algorithm in optical fiber hydrophone
AU - Wang, Kai
AU - Shi, Qingping
AU - Dai, Zhiguang
AU - Tian, Changdong
AU - Xie, Shangran
AU - Yang, Chang
AU - Cao, Shan
AU - Duan, Fajie
AU - Zhang, Min
AU - Liao, Yanbiao
PY - 2012
Y1 - 2012
N2 - The phase generated carrier (PGC) arctangent algorithm needs to be compensated when the carrier modulation depth C deviates from 2.63 rad. Parameters measurement error can induce an incomplete compensation in the arctangent algorithm. The demodulation distortion due to parameters estimation error is analyzed quantitatively in this paper. The relative amplitude error (RAE) and harmonic suppression ratio (HSR) are considered, which indicate a linear distortion and a nonlinear one separately. Theoretical analysis shows that the fluctuation range of RAE has a linear relation with an absolute value of △C which is the estimation error of the modulation depth C. The fluctuation range of RAE also has a square relation with △φ1, △φ2 which are the estimation error of the phase delay △φ1 △φ2 of fundamental and second harmonic carriers respectively. Similarly, minimum HSR decreases by 6dB along with a doubled absolute value of △C and by 12dB with that of △φ1. Experimental results are presented to corroborate the theory.
AB - The phase generated carrier (PGC) arctangent algorithm needs to be compensated when the carrier modulation depth C deviates from 2.63 rad. Parameters measurement error can induce an incomplete compensation in the arctangent algorithm. The demodulation distortion due to parameters estimation error is analyzed quantitatively in this paper. The relative amplitude error (RAE) and harmonic suppression ratio (HSR) are considered, which indicate a linear distortion and a nonlinear one separately. Theoretical analysis shows that the fluctuation range of RAE has a linear relation with an absolute value of △C which is the estimation error of the modulation depth C. The fluctuation range of RAE also has a square relation with △φ1, △φ2 which are the estimation error of the phase delay △φ1 △φ2 of fundamental and second harmonic carriers respectively. Similarly, minimum HSR decreases by 6dB along with a doubled absolute value of △C and by 12dB with that of △φ1. Experimental results are presented to corroborate the theory.
KW - Arctangent demodulation algorithm
KW - Carrier phase delay
KW - Harmonic suppression ratio(HSR),modulation depth
KW - Optical fiber hydrophone
KW - Parameter estimation
KW - Phase generated carrier(PGC)
KW - Relative amplitude error(RAE)
UR - http://www.scopus.com/inward/record.url?scp=84875616966&partnerID=8YFLogxK
U2 - 10.1117/12.974817
DO - 10.1117/12.974817
M3 - Conference contribution
AN - SCOPUS:84875616966
SN - 9780819491039
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - 22nd International Conference on Optical Fiber Sensors
T2 - 22nd International Conference on Optical Fiber Sensors
Y2 - 15 October 2012 through 19 October 2012
ER -