非对称干涉仪引导式鉴相分析

Performance evaluation of phase discrimination with accumulation for asymmetric interferometer

针对非对称干涉仪高精度鉴相问题,在高增益通道检测引导下,对高增益通道参与过渡的间接式鉴相方法和不参与过渡的直接式鉴相方法,通过建立信号接收的数学模型,进行了鉴相误差下限理论分析,并开展仿真验证。分析和仿真结果表明,对于典型的非对称干涉仪系统,2种鉴相方式对窄带脉冲的鉴相性能相当,仅当信号调制导致低增益通道内单子带信噪比低于2 dB时,间接鉴相可以带来较为显著的精度提升。

Considering the need of high-precision phase discrimination for asymmetric interferometer,the ac⁃curacy of indirect and direct phase estimator is evaluated theoretically and verified via simulation based on the sig⁃nal model,where indirectivity and directivity refer to whether the estimator utilize amplitude and phase from highgain channel.The results show that for a typical asymmetric interferometer,the accuracy of two kinds of estima⁃tor is comparable for single-tone pulse,and indirect phase estimator could bring about significant improvement on⁃ly when the modulation makes the sub-band signal-to-noise ratio lower than 2 dB in low-gain channel.