A High-Resolution Imaging Radar at 580 GHz

Penetrating 3-D Imaging at 4- and 25-m Range Using a Submillimeter-Wave Radar

“…We have addressed this problem by implementing for the first time an ultra-broadband submillimeter-wave radar that can map a person at the sub-cm scale in three dimensions. Using this technique, we are able to generate high-resolution images and remove the clutter signals to reveal hidden objects at standoff ranges of 4 and 25 m. This work represents a significant improvement over that described in [6], where only a brightly reflective concealed object could be detected at 4 m standoff, and where the image resolution was inferior in all dimensions. We also show here how the system can be readily scaled to larger standoff ranges, but increasing its speed to near-real-time frame rates will require a substantial effort to develop a multi-pixel imaging radar array.…”

A Doppler aliasing free micro-motion parameter estimation method in the terahertz band

“…Its position in the spectrum confers special properties and applications on terahertz waves that differ from other bands [1][2][3]. With breakthroughs in terahertz sources, signal detectors and other devices, the terahertz radar technology has developed rapidly, and many terahertz radar systems have been established, mainly for the study of high resolution imaging [4][5][6][7]. Some terahertz devices and radar systems are getting mature, and examples are the 0.85 THz vacuum-based power amplifier designed by Northrop Grumman Corporation [8] and the ultra-high-resolution radar Miranda 300 designed by the FGAN Research Institute for High Frequency Physics and Radar Techniques [9].…”

“…Terahertz radar usually utilizes frequency modulated continuous wave (FMCW) signals due to low peak power requirement. For example, both the 220 GHz COBRA radar of FGAN [6] and the 580 GHz imaging radar of Jet Propulsion Laboratory (JPL) [7] utilize FMCW. In order to ensure the linearity of the FMCW transmitted signal, the equivalent PRF can't be too large, and therefore the limited PRF sets an upper limit to the maximal observable non-aliasing Doppler values.…”

Terahertz active imaging radar: preprocessing and experiment results

“…In 2006, RJ Dengler and KB Cooper et al of JPL have successfully developed the first highresolution terahertz imaging system with a 2-cm range resolution; this system introduced FMCW radar technology into the imaging system, processed the waveform distortion compensation by software, and obtained a 2-cm range resolution (internal 4 m) [12]. In 2008, KB Cooper et al who came up with a 0.6 THz radar imaging system have successfully developed a 0.58 THz high-resolution three-dimensional imaging radar system based on the 0.6 THz radar imaging system [13]. The imaging system used in ISAR imaging can obtain subcentimeter resolution.…”