摘要
将非线性调频(NLFM)信号建模为高阶多项式相位信号(PPS)模型,采用由低阶离散多项式变换(DPT)到高阶DPT的逆向定阶方法确定模型阶数,并在此基础上,给出一种正弦调频信号(SFM)的DPT参数估计算法,可以实现对载波频率、调制频率及调频系数的估计。该算法不受调频系数范围的限制,核心环节为延时相关和FFT。仿真表明当SNR≥6dB时,调频参数的均方根误差小于-10dB。采用ADI公司TS201S芯片作为处理器,算法运行时间为3.30603ms,能够满足一般实时处理的要求。
In this paper, a nonlinear FM （NLFM） signal is modeled as a high-order polynomial phase signal （PPS）. A converse order judgment method using discrete polynomial-phase transform （DPT） from low order to high order is proposed to fix the order of PPS model. Furthermore, a parameter estimation algorithm based on DPT for the sine FM （SFM） signal is given, which can compute the carder frequency, modulating frequency and FM coefficient. This algorithm is suitable for NBFM signals as well as WBFM signals. Its core steps are delay correlation and FFF. The simulation results showed that when SNR≥6 dB, the RMSE〈-10 dB. The total run time is 3.30603 ms based on TS201S processor of ADI company, which can fulfill the need of real-time processing.
出处
《电子测量与仪器学报》
CSCD
2009年第6期63-67,共5页
Journal of Electronic Measurement and Instrumentation
基金
国防预研基金(编号:41101030401)资助项目
