Improved Design of the Microwave Level Meter upon VCO Nonlinearity

마이크로파 거리계의 VCO 비선형성에 의한 시스템 특성 분석 및 개선 방안 연구

In this paper, we have presented an improved design of the microwave level meter based on the principle of FM-CW radar. First, we have analyzed the effect of VCO nonlinearity on the spectral broadening of the beat signal, and presented a new type of design theory to linearize VCO tuning curve adopting FFT algorithm. Simulation results for a VCO having the linearity of 25% have been presented, which show the usefulness of the design algorithm.