FMCW Radar Range Performance Improvement With Modified Adaptive Sampling Method

The nonlinear frequency sweep in frequency-modulated continuous-wave radar systems is analyzed. The main lobe broadens with the fast Fourier transform in the presence of distortion, which makes it difficult to resolve closely spaced targets. A novel modified-adaptive-sampling method is presented. To demonstrate the validity of the presented technique, a computer simulation was conducted, and the results show a marked improvement in the shape of the spectrum and the range resolution.