In this paper, we introduce a novel concept for frequency-modulated continuous-wave radar. The approach is based on an interlaced chirp sequence waveform, which is controlled by phase-locked loops (PLLs). The use of PLLs improves frequency chirp linearity and reduces phase noise compared with open-loop voltage-controlled oscillators commonly used to generate the fast chirps. In contrast to basic range-Doppler processing, it enables higher target velocities to be detected unambiguously at the same resolution, which makes it suitable for automotive applications. Separate frequency synthesizers generate the interlaced ramps in the system. An RF switch combines these two signals to suppress transients caused by oscillator overshoot and to avoid incoherencies due to programming times of the PLL ICs. We built a prototype radar system in K-band. The test results are promising and bode well for other applications.

+More

plls rf switch fast automotive applications rangedoppler frequencymodulated continuouswave target velocities interlaced chirp sequence waveform openloop voltagecontrolled oscillators oscillator overshoot incoherencies phase noise transients frequency chirp linearity pll interlaced ramps phaselocked loops radar system programming times

Denys Shmakov, Gang Li, Marc-Michael Meinecke, Stephan Max, Martin Vossiek,Karsten Thurn,.Concept and Implementation of a PLL-Controlled Interlaced Chirp Sequence Radar for Optimized Range–Doppler Measurements. 64 (10),3280-3289.

Denys Shmakov, et al."Concept and Implementation of a PLL-Controlled Interlaced Chirp Sequence Radar for Optimized Range–Doppler Measurements" 64

Denys Shmakov, Gang Li, Marc-Michael Meinecke, Stephan Max, Martin Vossiek,Karsten Thurn,"Concept and Implementation of a PLL-Controlled Interlaced Chirp Sequence Radar for Optimized Range–Doppler Measurements"