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SiGe-MMIC based D-Band Radar for Accurate FMCW Multi-Target Vibration Measurements

: Jaeschke, T.; Bredendiek, C.; Pohl, N.


Institute of Electrical and Electronics Engineers -IEEE-; IEEE Microwave Theory and Techniques Society:
International Microwave Symposium, IMS 2014 : 1-6 June 2014, Tampa Bay, Florida
Piscataway, NJ: IEEE, 2014
ISBN: 978-1-4799-3868-1
ISBN: 978-1-4799-3869-8
International Microwave Symposium (IMS) <2014, Tampa Bay/Fla.>
Fraunhofer FHR ()

In this paper a wideband D-Band radar for high precision multi-target vibration measurements is presented. The system is based on a PLL stabilized SiGe MMIC with two VCOs for highly linear fractional-N FMCW sweep generation from 122 to 170 GHz and ≈1ms ramp duration. To demonstrate the capabilities of the FMCW radar, first measurement results are presented. Due to the ultra-wide bandwidth of 48 GHz (≈33%) and the resulting range resolution of 6.04mm (-6 dB width, Hanning window), target separation is even possible in very dense multi-target environments. In freespace measurements with a target in 1 meter distance to the antenna and a SNR of ≈50 dB a distance standard deviation of better than 10 μm is achieved. The combination of phase and peak-center algorithms allow vibration measurements even for fast and large amplitude oscillations. In addition range doppler plots are presented for advanced high precision movement analysis in multi-target environments. Jaeschke, T.; Bredendiek, C.; Pohl, N.: SiGe-MMIC based D-Band Radar for Accurate FMCW Multi-Target Vibration Measurements, IEEE International Microwave Symposium (IMS) 2014, June 2014