Ultra-broadband voltage-controlled oscillator linearization for frequency modulated continuous wave MMW imaging systems

Jonathan R. Tedeschi; David M. Sheen; Stephanie L. McDaid

doi:10.1117/12.2591789

12 April 2021 Ultra-broadband voltage-controlled oscillator linearization for frequency modulated continuous wave MMW imaging systems

Jonathan R. Tedeschi, David M. Sheen, Stephanie L. McDaid

Author Affiliations +

Proceedings Volume 11742, Radar Sensor Technology XXV; 117421B (2021) https://doi.org/10.1117/12.2591789
Event: SPIE Defense + Commercial Sensing, 2021, Online Only

Abstract

Millimeter-wave (MMW) imaging systems require high resolution and spurious free dynamic range (SFDR) to produce images with low artifacts. In these systems, lateral resolution is determined by the center frequency and the ratio of the aperture size to the distance to the target. The downrange resolution is determined by the system bandwidth; for very fine downrange resolution of a target, or material layers/discontinuities, the bandwidth must be very broad. Additionally, the response over the bandwidth must be measured very rapidly to support high speed acquisition over large apertures. A voltage-controlled oscillator (VCO) is a standard means of generating the ultra-broadband frequency chirp. This paper investigates the use of a broadband VCO for use in MMW imaging systems, a linear-phase calibration technique, and digital-to-analog converter (DAC) parameter considerations for controlling the VCO.

Conference Presentation

Citation Download Citation

Jonathan R. Tedeschi, David M. Sheen, and Stephanie L. McDaid "Ultra-broadband voltage-controlled oscillator linearization for frequency modulated continuous wave MMW imaging systems", Proc. SPIE 11742, Radar Sensor Technology XXV, 117421B (12 April 2021); https://doi.org/10.1117/12.2591789

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