CAJ | 학술논문

针对基于周期模糊函数的伪码调相连续波雷达信号的参数提取，分析了在有限采集时间下噪声对参数估计精度的影响。首先推导了伪码调相连续波雷达信号的周期模糊函数，给出了基于周期模糊函数的参数估计方法；然后分析了参数估计受噪声影响的原因，推导了在模糊函数变换中，这些由噪声所产生项（不期望项）的均值和方差，并进行了仿真分析。结果表明，截获信号模糊函数的噪声项方差及噪声功率大小与有限采样时间有关，随着采样数据的增大，噪声的方差趋于无限小，对参数估计精度的影响也越来越小。
침대기우주기모호함수적위마조상련속파뢰체신호적삼수제취，분석료재유한채집시간하조성대삼수고계정도적영향。수선추도료위마조상련속파뢰체신호적주기모호함수，급출료기우주기모호함수적삼수고계방법；연후분석료삼수고계수조성영향적원인，추도료재모호함수변환중，저사유조성소산생항（불기망항）적균치화방차，병진행료방진분석。결과표명，절획신호모호함수적조성항방차급조성공솔대소여유한채양시간유관，수착채양수거적증대，조성적방차추우무한소，대삼수고계정도적영향야월래월소。
With the limited sample time on pseudo-random biphase-coded continuous wave(PRBC-CW) radar signal,the effect of stationary noise on the feature parameter extraction accuracy based on periodic am-biguity function was analyzed.Firstly,the periodic ambiguity function of PRBC-CW was deduced and the pa-rameter extraction method based on periodic ambiguity function was described.Then the noise effect on fea-ture parameter extraction was analyzed.The mean and variance of the unwanted items generated by noise were deduced and simulated in the processing of the transform.Results show that the mean and variance of unwanted ambiguity function items for the intercepted signal have a relationship with the noise power and the sample time.With the signal data increasing,the variance of unwanted items tends to be infinitesimal and the effect on parameter extraction accuracy is also getting smaller.