FMCW雷达差频信号的非线性分析  

Analysis to Nonlinearity of Difference-Frequency Signal for FMCW Radar

作　　者：王虹[1] 李兴国[1] 

机构地区：[1]南京理工大学电光学院,南京210094

出　　处：《电光与控制》2010年第10期33-36,共4页Electronics Optics & Control

基　　金：国防预研项目资助(513010403)

摘　　要：FMCW雷达具有大的时宽带宽积,可达到较高的测距精度,但由于压控振荡器等器件非线性的存在,使测距精度大大降低。通过理论分析这一非线性对用于测距的差频信号频谱的影响,结合直接采集和实测相应的差频信号,确定非线性误差的来源和频率范围。采用模拟窄带滤波,降低扰频信号干扰,并通过实验测量,验证了利用该方法可以达到提高测距精度的效果。FMCW radars can have high precision of ranging due to its large time-bandwidth product,but the precision may be decreased greatly because of the nonlinearity of some devices such as Voltage-Controlled Oscillator（VCO）.The impact of this nonlinearity upon difference frequency signal for range detection was analyzed theoretically,and the difference frequency signal corresponding to the test was acquired directly to determine the source and the frequency range of nonlinear error.Narrow band filter was used to reduce the interference of error frequency.Experimental measurement verified that using this method can improve the ranging precision.

关 键 词：FMCW 测距精度 差频 非线性 窄带滤波 

分 类 号：V271.4[航空宇航科学与技术—飞行器设计] TN952[电子电信—信号与信息处理]