一种用于FMCW雷达系统的中频信号滤波器.PDFVIP

Vol No JOU RNA L OF H EFEI U NIV ERSIT Y O F T EC HNOL OGY M ay doi issn j F M C W FM CW FM CW DSP FIR FM CW FIR T N A An intermediate frequency signal filter applied in FMCW radar systems QI Haochen Z HA N G Jian Z HA N G Jie GA O Wei ing q School of Elect ro nic Science and A pplied Phy sics Hef ei U niv er sity of T echnology H ef ei China Abstract Frequency modulated continuous w ave FM CW radar is a distance measuring sensor of auto mobile anticollision sy stems in recent y ears In the radar sy stem the filter is one of the most key cir cuit s in intermediate f requency signal processing Based on the analy sis of the interf erential noises an intermediate f requency sig nal filter of the FM CW radar sy stem is desig ned T his filter includes high ass and low ass filtering circuit part and DSP based finite impulse response FIR digital filtering u p p nit T he simulation and ex perimental result s validate the eff ectiveness of the filter in removing the tri angular w ave modulating sig nals of low f requency and high f requency sig nals f rom out side the sy stem as w ell as the discrete noise T he filter can be helpf ul in improving the accuracy of radar ranging or ra dar velocity measuring Key words f requency modulated continuous w ave FM CW radar intermediate f requency sig nal high ass filtering low ass filtering finite impulse response FIR filter p p FM CW f requency modulated continuous w ave