CAJ | 학술논문

三阶多项式相位信号是一类非常重要而常见的非平稳信号.在非合情况下,针对低信噪比的三阶多项式相位信号参数估计问题提出一种新方法.该方法采用基于滤波器组的短时Radon-Wigner变换的时频检测算法完成信号的检测并获得信号瞬时频率的粗略估计,利用三阶多项式对瞬时频率进行最小二乘拟合,从而获得信号参数的粗略估计,再用局部二维搜索和快速傅里叶解线调的方法完成信号参数的精确估计.计算机模拟仿真证明了此方法在低信噪比和较短数据条件下的有效性.
삼계다항식상위신호시일류비상중요이상견적비평은신호.재비합정황하,침대저신조비적삼계다항식상위신호삼수고계문제제출일충신방법.해방법채용기우려파기조적단시Radon-Wigner변환적시빈검측산법완성신호적검측병획득신호순시빈솔적조략고계,이용삼계다항식대순시빈솔진행최소이승의합,종이획득신호삼수적조략고계,재용국부이유수색화쾌속부리협해선조적방법완성신호삼수적정학고계.계산궤모의방진증명료차방법재저신조비화교단수거조건하적유효성.
3 order polynomial phase signals(PPS)are important and common non-stationary signals.A new method was proposed to estimate the PPS parameters in low SNR under non-cooperative condition.Firstly,filter bank combining with short time Radon-Wigner transform algorithm was adopted to get a rough estimation of the instantaneous frequency(IF)curve.Then,a 3-oder polynomial was used to fit the IF curve by least square method and a rough estimation of the signal parametem was made.After that,local two-dimension searching and FFr dechirp method were used to get the parameter's accurate estimation.The merit of this new method is validated by illustrative examples in low SNR and relatively shon data length condition.