| 摘要 |
A frequency modulated continuous wave (FMCW) phase shift radar system includes a transmitter, a receiver, and a linearly-tuned oscillator circuit arranged in the transmitter as a source of electromagnetic radiation. The linearly-tuned oscillator circuit has a voltage controlled oscillator (VCO); and a closed loop feedback circuit including a local oscillator and a harmonic mixer coupled to receive a stabilized local oscillator (LO) frequency signal from the local oscillator and a radio frequency (RF) signal from an output of the voltage controlled oscillator. The harmonic mixer mixes the LO frequency signal with the RF signal to produce an intermediate frequency (IF) signal, and a linear frequency discriminator is coupled to receive the IF signal and to produce an output voltage signal which is applied to an input of the VCO to stabilize the latter, thus completing the feedback circuit. A signal processing unit is coupled to the receiver to compute the range and the velocity of objects detected by the system, and a miniature front-end assembly includes a planar phased array, and a planar circuit including the VCO, the stabilized LO, and the harmonic mixer.
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