Conventionally, resolution characterization of an imaging radar is performed by means of analyzing the diffraction limited point-spread-function (PSF) pattern of the radar. Such an analysis is straightforward and can easily be implemented at microwave and millimeter-wave frequencies using simple point-scatter targets. However, it poses significant challenges at submillimeter-wave (or THz) frequencies due to the strong scattering response of secondary objects that are used to align the PSF targets for imaging at these frequencies. As a result, the reconstructed PSF patterns suffer from artifacts caused by the secondary objects present in the background. In this work, we present the use of the acoustic levitation principle to obtain the PSF characterization of a 340 GHz stand-off imaging radar. We show that using a water droplet acoustically levitated at the focal point of the 340 GHz imaging radar, high-fidelity PSF characterization of the radar is achieved, revealing the resolution limits of the radar while exhibiting good signal-to-noise ratio (SNR).
|Publication status||Published - 2019|
|Event||SPIE Defense + Commercial Sensing: Passive and Active Millimeter-Wave Imaging XXII - Baltimore Convention Center, Baltimore, United States|
Duration: 14 Apr 2019 → 18 Apr 2019
|Conference||SPIE Defense + Commercial Sensing|
|Period||14/04/2019 → 18/04/2019|