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Digital Frequency Control Loop for Continuous-Wave and Stepped-Frequency Radars
Publikationstyp
Conference Paper
Date Issued
2022-01
Sprache
English
Institut
Start Page
18
End Page
21
Citation
IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNeT 2022)
Contribution to Conference
Publisher DOI
Scopus ID
ISBN of container
978-166543465-2
A common technique to control the transmit frequency of modern radar systems are phase-locked loops (PLLs). This paper presents an alternative PLL-free design, where a microcontroller (MCU) is used in a digital control loop to stabilize the output frequency of a voltage-controlled oscillator (VCO). Using a commercial 24 GHz integrated radar transceiver and the MCU, a discrete proportional (P) control algorithm tunes the VCO in real time without requiring a hardware PLL. In continuous-wave (CW) mode, a measurement precision of 7.6 μm is achieved. In a pulsed dual-tone operation mode, the unambiguous range is extended to 1.4 m by still achieving an accuracy of 25 mm.
Subjects
distance measurement
Doppler radar
frequency control
frequency-locked loop