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A microwave ultra-wideband (UWB) radar has an advantage for high range resolution and deep penetration depth in a concrete object, and is promising for non-destructive testing for aging transportation infrastructure. The traditional delay-and-sum (DAS) based imaging algorithm inherently suffers from an insufficient resolution to identify a detailed structure of buried targets. As promising alternative,...
140 GHz-band millimeter wave radars significantly expands the appilication range of three-dimensional (3-D) imaging sensors, making them suitable for short-range surveillance or watching sensors. The range points migration(RPM) is recently established as promising imaging approach for achieving an accurate and real-time 3-D imaging. However, in dealing with objects with many scattering points like...
Microwave mammography is promising alternative from X-ray based imaging modality, in terms of compactness, low cost and cell-friendly exposure. The most important part of this modality is a suppression of surface reflection clutters, which can be enhanced by combining accurate surface shape estimation. The coupling effect between antenna and breast surface degrades accuracy in the shape estimation,...
Microwave UWB(Ultra Wideband) radar is promising as a non-invasive medical imaging, such as breast cancer or brain stroke detection due to its non-ionizing feature and deeper penetration ability in low loss medium. While various imaging algorithms has been developed, most of them are based on delay-and-sum (DAS) approach, which could not accurately reconstruct the boundary of dielectric object, even...
Microwave ablation (MWA) is widely recognized as a promising treatment tool for cancer. Real-time monitoring of the dimensions of the ablation zone is indispensable for ensuring an effective and safe treatment. In this paper, we propose a microwave imaging algorithm for monitoring the evolution of the ablation zone. This algorithm estimates the boundary of the ablation zone by exploiting the time...
Ultra-wideband (UWB) radar system has a great advantage as short range 3-dimentional(3-D) sensor with high range resolution being suitable, for target recognition in optically blurred situation. As one of the most efficient 3-D imaging approaches, the range point migration(RPM) method has been developed, which specifies target boundary extraction using measured ranges. The RPM method stills suffers...
A microwave radar system is a useful tool for all-weather type remote sensing, such as terrain surface measurement. It is well known fact that a resolution of time-of-arrival (TOA) is strictly determined by the frequency bandwidth of transmitted signal. As super-resolution technique beyond such limitation, a compressed sensing (CS) algorithm has come under spotlight because a sparse assumption is...
Microwave ultra-wide band (UWB) radars with higher range resolution and penetration ability for low lossy medium are promising as non-destructive testing for aging transportation infrastructure or non-invasive internal inspection for human body such as cancer or brain stroke detection. While there are many studies for reconstructing complex permittivity for object based on the solution of domain integral...
Microwave UWB (Ultra Wideband) radar is promising as a non-invasive medical imaging, such as breast cancer or brain stroke detection due to its non-ionizing feature and deeper penetration ability in low loss medium. While various methods for specifying the breast cancer detection issue, have been developed, most of them require a prerequisite that a shape of breast surface is accurately determined...
Doppler Light-Detection-And-Ranging (LIDAR) system is an essential tool for real-time wind monitoring for aircraft taking off and landing. Single LIDAR model is preferable in terms of cost and being free from synchronization problem of multiple LIDARs. There are many studies for single LIDAR based velocity estimation. In specifying the recognition for typical air turbulences, such as tornado, microburst...
140 GHz ultra-wideband millimeter wave radars significantly expand the capacities of three-dimensional (3-D) imaging sensors, making them suitable for short-range surveillance or security purposes. For such applications, we have already developed the range points migration (RPM) method, which achieves highly accurate 3-D boundary extraction. However, to deal with multiple targets with many reflection...
High-resolution, short-range sensors that can be applied in optically challenging environments (e.g., in the presence of clouds, fog, and/or dark smog) are in high demand. Ultrawideband (UWB) millimeter-wave radars are one of the most promising devices for the above-mentioned applications. For target recognition using sensors, it is necessary to convert observational data into full 3-D images with...
Range points migration (RPM) method is a successful 3-D imaging algorithm with higher accuracy and less computational cost. Due to the limitation of radar aperture size, usually, the boundary points estimated by RPM method only cover a small portion of target surface. Therefore image extrapolation method is needed for improving the image result of RPM method. The conventional image extrapolation method...
Microwave ultra-wideband (UWB) radar systems have numerous advantages for high range resolution and an ability to penetrate dielectric objects. Internal imaging of dielectric objects by UWB radar is a promising nondestructive method of testing aging roads and bridges and a noninvasive technique for medical diagnoses or human vital sign detection. We have already developed an original method called...
Through-the-wall radar (TWR) technique with UWB (ultra wide-band) signals are promising candidates for nondestructive testing or reliable human detection buried under collapsed walls in disaster scenes. As an efficient 3-dimensional imaging approach, the range points migration (RPM) method has been established, which can transcend the performance limitation of the conventional delay-and-sum approaches,...
A microwave ultra-wideband (UWB) radar system has an advantage for high range resolution and penetrating ability in dielectric object, and is promising for the applications, such as non-destructive testing for aging road or bridge and non-invasive human body inspection. We have already developed an accurate and high-resolution target boundary extraction method as range points migration (RPM) method,...
Ultra-wideband (UWB) millimeter wave radar has a great advantage for achieving higher spatial resolution and is promising for collision avoidance or target recognition in short range sensing issue. In this paper, we focus on the 140- GHz band radar system, which has a significant advantage for wider frequency range and more compact radar module. For such application, we have originally developed an...
Ultra wideband (UWB) radar with high range resolution is promising for short-range 3-dimensional (3-D) imaging applications, such as a sensor for rescue robot in disaster scene. We have already proposed the efficient 3-D imaging methods as range point migration (RPM) method, which has a definitive advantage for SAR or time-reversal approaches, in terms of computational burden, high accuracy and high...
A microwave ultra-wideband (UWB) radar system has an advantage for high range resolution and penetrating ability in dielectric object, and is promising for the applications, such as non-destructive testing for aging road or bridge and noninvasive human body inspection. We have already developed an accurate internal imaging approach based on the range points migration (RPM) method, combined with the...
Satellite-borne or aircraft-borne synthetic aperture radar (SAR) technique is useful for high resolution imaging analysis for terrain surface monitoring or surveillance, even in optically harsh environment. For surveillance application, there are various approaches for automatic target recognition (ATR) of SAR images aiming at monitoring unidentified ships or aircrafts. In addition, various types...
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