We present imaging results of a ground penetrating radar (GPR) dataset collected for permafrost studies at the APEX (Alaska Peatland EXperiment) BETA site, which is located approximately 30 miles southwest of Fairbank...
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ISBN:
(纸本)9781510674158;9781510674141
We present imaging results of a ground penetrating radar (GPR) dataset collected for permafrost studies at the APEX (Alaska Peatland EXperiment) BETA site, which is located approximately 30 miles southwest of Fairbanks, Alaska. The measurements were collected in an out-and-back style survey using a dual-frequency GPR with ultra-wide bandwidth centered at 170 MHz and 600 MHz. At each center frequency, we employ both conventional frequency-domain backprojection method and a sparse reconstruction technique with total variation minimization for subsurface image formation. As the latter minimizes the image gradient, it provides better edge preservation and improved reconstruction of extended targets, such as the permafrost table, compared to backprojection. We explore fusion of dual-frequency and dual-scan subsurface images and compare performance of various combinations of image formation and fusion methods in terms of enhanced detection of the top of the permafrost table.
This paper introduces a low-power, highly sensitive W-band (75-110 GHz) super-regenerative oscillator (SRO)-based vital sign radarsensor with a SIW monopole antenna integrated. The proposed radarsensor is implemente...
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ISBN:
(纸本)9781665494182
This paper introduces a low-power, highly sensitive W-band (75-110 GHz) super-regenerative oscillator (SRO)-based vital sign radarsensor with a SIW monopole antenna integrated. The proposed radarsensor is implemented using the 0.1-mu m GaAs pHEMT technology. Operating at the center frequency of 85.283 GHz, the proposed super-regenerative oscillator leverages 100 Hz and 20 kHz sinusoidal quench signals for control during the target detection. Experimental results validate the effectiveness of the proposed sensor in identifying the displacement frequency of an actuator along with human target vital signs. The achieved results show good agreement with the ground truth. Moreover, compared to the self-injection-locked (SIL) detection scheme, the proposed SRO radarsensor demonstrates superior characteristics, such as lower power consumption, higher sensitivity, and low system complexity.
The number of individuals within a group is crucial information for the correct association, robust tracking, and situation awareness. Traditional methods using the range profile's peaks are not suitable when targ...
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This study focuses on developing an extremely low C-SWaP radar sensing solution for single target tracking over a marine environment. The radar system-on-chip (SoC) Utilizes ultra-wideband (UWB) low-probability of int...
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ISBN:
(纸本)9781510661844;9781510661851
This study focuses on developing an extremely low C-SWaP radar sensing solution for single target tracking over a marine environment. The radar system-on-chip (SoC) Utilizes ultra-wideband (UWB) low-probability of intercept (LPI) and low-probability of detection (LPD), which provides a networked, range-based tracking solution when combined with an active phased array antenna. A key innovation of the technical implementation is range extension utilizing digital delay-line triggering, which synchronizes multiple SoC ICs to sample arbitrary ranges simultaneously.
Unmanned platforms are increasingly used in environments where human presence is restricted including military operations, disaster response, and remote exploration. The autonomous or semi -autonomous functioning of t...
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ISBN:
(纸本)9798350394917;9798350394900
Unmanned platforms are increasingly used in environments where human presence is restricted including military operations, disaster response, and remote exploration. The autonomous or semi -autonomous functioning of these vehicles is related to the perception system, which incorporate a range of sensors such as LIDAR, cameras, radar, and inertial measurement units (IMUs). However, dense vegetation poses significant challenges to object detection and recognition, introducing issues such as occlusion and signal distortion caused by foliage. This study presents the limitations of both active sensors ( LIDAR, radar) and passive sensors ( cameras) under adverse weather conditions and security concerns on the sensing capabilities of special-purpose UGVs
The typical GB-SAR image coordinate transformation approach conveniently ignores the impact of radarsensor attitude, resulting in an imaging projection plane that is not horizontal and bias in the 3D laser point clou...
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The concept of a unified, portable, and precise navigation solution for future precise manned and unmanned air vehicle landing support would need both enhanced GNSS technology and non-GNSS (such as precise approach ra...
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ISBN:
(纸本)9781510661844;9781510661851
The concept of a unified, portable, and precise navigation solution for future precise manned and unmanned air vehicle landing support would need both enhanced GNSS technology and non-GNSS (such as precise approach radar) together in one package. This concept and initial implementations are discussed. Initial evaluations using different Software-Defined-Radio (SDRs) to implement the GNSS augmentation functions are performed and compared to certified ground augmentation system receivers. The results show the promising feasibility of integrating GNSS augmentation and precise approach radar function to support future landing missions.
In this paper, we have designed a transparent, flexible metasurface capable of covering a 360 degrees cross-polarization reflection phase at 20 GHz. By selecting 13 distinct units based on the required phase distribut...
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ISBN:
(纸本)9798350389968
In this paper, we have designed a transparent, flexible metasurface capable of covering a 360 degrees cross-polarization reflection phase at 20 GHz. By selecting 13 distinct units based on the required phase distribution, we conformally mounted them on a foam column surface with a bending radius of 100mm. This approach facilitates wavefront control by aligning the equiphase surfaces of cross-polarized waves into a single plane. This technique significantly reduces the deterioration of the RCS pattern and cross-polarization ratio caused by surface scattering. Notably, in the frequency range of 15-29 GHz, the cross-polarized radar Cross Section (RCS) in the vertical direction exceeds the co-polarized RCS by more than 8.8 dB.
The fusion of millimeter-wave radar and optical camera is a challenge in the multi-sensor data fusion *** this paper a new space calibration algorithm is proposed to match the low-resolution radar point cloud informat...
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3D object detection aims to extract the spatial positions of objects from sensor data, thereby improving environmental awareness and comprehension. With the advancement of radartechnology, the 4D imaging radar offers...
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