文档介绍：基于DPT的非线性调频信号参数估计*
吕远祝俊唐斌
(电子科技大学电子工程学院, 成都 610054)
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≥6 dB时, 调频参数的均方根误差小于-10 dB。采用ADI公司TS201S芯片作为处理器, 03 ms, 能够满足一般实时处理的要求。
关键词: DPT;NLFM;PPS;判阶;SFM;参数估计
中图分类号: 文献标识码: A 国家标准学科分类代码:
Estimation of Nonlinear FM Signal Parameter Based on DPT
Lv Yuan Zhu Jun Tang Bin
(College of Electronic Engineering, UEST of China, Chengdu 610054, China)
Abstract: 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 pute the carrier 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 FFT. The simulation results showed that when SNR≥6 dB, the RMSE<-10 dB. The total run time is ms based on TS201S processor of pany, which can fulfill the need of real-time processing.
Keywords: DPT; NLFM; PPS; order judgment; SFM; parameter estimation
1 引言
本文于2008年月收到。
*基金项目: 国防预研基金资助项目(编号: