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This work presents self injection-locked (SIL) continuous-wave (cw) radar sensors based on resonant tunneling diode (RTD) oscillators. The free-running RTD oscillators show micrometer resolution in sampling the movement of a reflective target. The SIL device utilized a sawtooth-like frequency modulation with /2 periodicity induced by time-delayed feedback, which is used for unambiguous ranging. The maximum frequency shift achieved herein is 5. 5 GHz, whereby a frequency shift of about 1 GHz is used in operation. The achieved sensitivity of the SIL radar during operation is 9. 2 MHz m ^-{1}. We also propose a method for determining the absolute distance to the target based on the SIL frequency modulation mechanism as a proof of concept. Using a simplified circuit model for the RTD SIL radar, we convert the corresponding delay-differential equation to an approximate dynamic amplitude-phase system, to give an envelope description for the SIL radar of reduced stiffness compared to transient simulations.
Watermann et al. (Thu,) studied this question.
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