A Millimeter-Wave Low-Power Active Backscatter Tag for FMCW Radar Systems

作者：Strobel Axel^*; Carlowitz Christian; Wolf Robert; Ellinger Frank; Vossiek Martin

来源：IEEE Transactions on Microwave Theory and Techniques, 2013, 61(5): 1964-1972.

DOI：10.1109/TMTT.2013.2252915

• Chirp radar
• distance measurement
• frequency-modulated continuous-wave (FMCW) secondary radar
• FM radar
• switched injection-locked oscillator (SILO)

In this paper, a fully integrated active backscatter transponder based on the switched injection-locked oscillator (SILO) principle for frequency-modulated continuous-wave radar applications is presented. Furthermore, a method to characterize a SILO amplifier is extended and utilized to measure the system parameters of the presented backscatter tag that operates at 34.45 GHz. It is digitally tunable from 32.7 to 35.4 GHz and reaches an unpulsed output power of 5 dBm. Above injection power levels of -53 dBm, the SILO tag responds phase coherent at its maximum output power. In system measurements, the SILO backscatter transponder was used to perform distance measurements at ranges from 0.7 to 11.5 m. A remarkably good mean distance measurement error of 7 cm with a standard deviation of 10 cm was achieved in a strong multipath environment. The single measurement precision is below 3 mm.

• 出版日期2013-5