Analysis to Nonlinearity of Difference-Frequency Signal for FMCW Radar
LI Xing-guo · Electronics Optics & Control · 2010
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.