Longyong Chen
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View article: High-Resolution Monitoring and Driving Factor Analysis of Long-Term Surface Deformation in the Linfen-Yuncheng Basin
High-Resolution Monitoring and Driving Factor Analysis of Long-Term Surface Deformation in the Linfen-Yuncheng Basin Open
The comprehensive, accurate, and rapid acquisition of large-scale surface deformation using Interferometric Synthetic Aperture Radar (InSAR) technology provides crucial information support for regional eco-geological safety assessments and…
View article: A Channel-Adaptive Range-Doppler Domain Filtering Serial BAQ Algorithm and Comparative Analysis
A Channel-Adaptive Range-Doppler Domain Filtering Serial BAQ Algorithm and Comparative Analysis Open
With the growing demand for large-scale urban observation, multi-channel technology has become a cornerstone of high-resolution wide-swath SAR systems. The challenge of storing and transmitting the large data volumes generated by multi-cha…
View article: A Novel Azimuth Channel Errors Estimation Algorithm Based on Characteristic Clusters Statistical Treatment
A Novel Azimuth Channel Errors Estimation Algorithm Based on Characteristic Clusters Statistical Treatment Open
Azimuth multichannel techniques are promising in the high-resolution and wide-swath (HRWS) synthetic aperture radar (SAR) system. However, in practical engineering, errors among channels will significantly impact the reconstruction of mult…
View article: A Multi-Parameter Calibration Method Based on the Newton Method and the Genetic Algorithm in Airborne Array Synthetic Aperture Radar
A Multi-Parameter Calibration Method Based on the Newton Method and the Genetic Algorithm in Airborne Array Synthetic Aperture Radar Open
Airborne array synthetic aperture radar (SAR) can achieve three-dimensional (3D) imaging of the observed scene in a single flight. Nevertheless, the imaging process of airborne array SAR is subject to various parameter errors due to unstab…
View article: Enhancing the correlation between azimuth and Doppler frequency for speed estimation of nearby tangential targets
Enhancing the correlation between azimuth and Doppler frequency for speed estimation of nearby tangential targets Open
With the development of intelligent transportation systems, traffic supervision radar with wide coverage plays a crucial role in traffic management and vehicle-road coordination. The correlation between Doppler frequency and azimuth has be…
View article: Angle Estimation Using Learning-Based Doppler Deconvolution in Beamspace with Forward-Looking Radar
Angle Estimation Using Learning-Based Doppler Deconvolution in Beamspace with Forward-Looking Radar Open
The measurement of the target azimuth angle using forward-looking radar (FLR) is widely applied in unmanned systems, such as obstacle avoidance and tracking applications. This paper proposes a semi-supervised support vector regression (SVR…
View article: A Novel Multi-Beam SAR Two-Dimensional Ambiguity Suppression Method Based on Azimuth Phase Coding
A Novel Multi-Beam SAR Two-Dimensional Ambiguity Suppression Method Based on Azimuth Phase Coding Open
In order to address the problems of range ambiguity and azimuth ambiguity in the wide-swath imaging of synthetic aperture radar (SAR), this paper proposes a multi-beam SAR two-dimensional ambiguity suppression method based on azimuth phase…
View article: Building point cloud reconstruction in TomoSAR based on deep learning semantic segmentation
Building point cloud reconstruction in TomoSAR based on deep learning semantic segmentation Open
Tomographic synthetic aperture radar (TomoSAR) possesses 3D imaging capability, making it significant for building reconstruction using TomoSAR data. The reconstruction algorithm is closely related to building point cloud detection, while …
View article: Position-Feature Attention Network-Based Approach for Semantic Segmentation of Urban Building Point Clouds from Airborne Array Interferometric SAR
Position-Feature Attention Network-Based Approach for Semantic Segmentation of Urban Building Point Clouds from Airborne Array Interferometric SAR Open
Airborne array-interferometric synthetic aperture radar (array-InSAR), one of the implementation methods of tomographic SAR (TomoSAR), has the advantages of all-time, all-weather, high consistency, and exceptional timeliness. As urbanizati…
View article: Position and Orientation System Error Analysis and Motion Compensation Method Based on Acceleration Information for Circular Synthetic Aperture Radar
Position and Orientation System Error Analysis and Motion Compensation Method Based on Acceleration Information for Circular Synthetic Aperture Radar Open
Circular synthetic aperture radar (CSAR) possesses the capability of multi-angle observation, breaking through the geometric observation constraints of traditional strip SAR and holding the potential for three-dimensional imaging. Its sub-…
View article: A Novel Automatic Registration Method for Array InSAR Point Clouds in Urban Scenes
A Novel Automatic Registration Method for Array InSAR Point Clouds in Urban Scenes Open
The array interferometric synthetic aperture radar (Array InSAR) system resolves shadow issues by employing two scans in opposite directions, facilitating the acquisition of a comprehensive three-dimensional representation of the observed …
View article: A Multichannel, Multipulse, Multiweight Block-Adaptive Quantization (3MBAQ) Algorithm Based on Space-Borne Multichannel SAR Doppler Domain A-BAQ
A Multichannel, Multipulse, Multiweight Block-Adaptive Quantization (3MBAQ) Algorithm Based on Space-Borne Multichannel SAR Doppler Domain A-BAQ Open
Amid the conflict between the current huge data volumes and the requirement for large-compression-ratio compression in space-borne multichannel SAR, this paper proposes a data compression method that uses the adaptive bit allocation BAQ me…
View article: A Modified Iteration-Free SPGA Based on Removing the Linear Phase
A Modified Iteration-Free SPGA Based on Removing the Linear Phase Open
In traditional Stripmap SAR imaging, the platform motion error will bring the phase error in the azimuthal direction to the image, which will have a series of effects on the imaging quality. The traditional autofocus algorithm—Stripmap Pha…
View article: High-Resolution and Wide-Swath 3D Imaging for Urban Areas Based on Distributed Spaceborne SAR
High-Resolution and Wide-Swath 3D Imaging for Urban Areas Based on Distributed Spaceborne SAR Open
Tomographic synthetic aperture radar (TomoSAR) obtains elevation resolution by adding multiple baselines successively in the direction perpendicular to the line of sight, thereby realizing three-dimensional (3D) reconstruction of complex s…
View article: The Calibration Method of Multi-Channel Spatially Varying Amplitude-Phase Inconsistency Errors in Airborne Array TomoSAR
The Calibration Method of Multi-Channel Spatially Varying Amplitude-Phase Inconsistency Errors in Airborne Array TomoSAR Open
Airborne array tomographic synthetic aperture radar (TomoSAR) can acquire three-dimensional (3D) information of the observed scene in a single pass. In the process of airborne array TomoSAR data imaging, due to the disturbance of factors s…
View article: Motion Error Estimation and Compensation of Airborne Array Flexible SAR Based on Multi-Channel Interferometric Phase
Motion Error Estimation and Compensation of Airborne Array Flexible SAR Based on Multi-Channel Interferometric Phase Open
Airborne array synthetic aperture radar (SAR) has made a significant breakthrough in the three-dimensional resolution of traditional SAR. In the airborne array SAR 3D imaging technology, the baseline length is the main factor restricting t…
View article: 3D Imaging Method of Airborne Array Flexible SAR Based on Distributed POS
3D Imaging Method of Airborne Array Flexible SAR Based on Distributed POS Open
The longer the baseline length of an airborne array synthetic aperture radar (SAR) is, the richer the ground object information can be resolved. The airborne array flexible SAR can overcome the limitation that the baseline length is limite…
View article: The Adaptive Streaming SAR Back-Projection Algorithm Based on Half-Precision in GPU
The Adaptive Streaming SAR Back-Projection Algorithm Based on Half-Precision in GPU Open
The back-projection (BP) algorithm is completely accurate in the imaging principle, but the computational complexity is extremely high. The single-precision arithmetic used in the traditional graphics processing unit (GPU) acceleration sch…
View article: Elevation Resolution Enhancement Method Using Non-Ideal Linear Motion Error of Airborne Array TomoSAR
Elevation Resolution Enhancement Method Using Non-Ideal Linear Motion Error of Airborne Array TomoSAR Open
Airborne array tomographic synthetic aperture radar (TomoSAR) is a major breakthrough, which can obtain three-dimensional (3D) information of layover scenes in a single pass. As a high-resolution SAR, airborne array TomoSAR has considerabl…
View article: Building 3D reconstruction of TomoSAR using multiple bounce scattering model
Building 3D reconstruction of TomoSAR using multiple bounce scattering model Open
Tomographic synthetic aperture radar (TomoSAR) plays a critical role in the 3D reconstruction of complex urban targets with the capability of 3D imaging. Nevertheless, multipath scattering interference is common in 3D point clouds, serious…
View article: The First Airborne Experiment of Sparse Microwave Imaging: Prototype System Design and Result Analysis
The First Airborne Experiment of Sparse Microwave Imaging: Prototype System Design and Result Analysis Open
In this paper we report the first airborne experiments of sparse microwave imaging, conducted in September 2013 and May 2014, using our prototype sparse microwave imaging radar system. This is the first reported imaging radar system and ai…
View article: A New Method of Joint Radar and Communication Waveform Design and Signal Processing Based on OFDM-chirp
A New Method of Joint Radar and Communication Waveform Design and Signal Processing Based on OFDM-chirp Open
Waveform design of joint radar and communication has become a focus of intense research in recent years. Some scholars have proposed to use the odd and even carrier of Orthogonal Frequency Division Multiplexing (OFDM) signal to modulate th…
View article: Physical layer encryption scheme based on cellular automata and DNA encoding by hyper-chaos in a CO-OFDM system
Physical layer encryption scheme based on cellular automata and DNA encoding by hyper-chaos in a CO-OFDM system Open
This study proposes an encryption scheme combining cellular automata (CA) and DNA encoding to improve security of a coherent optical orthogonal frequency division multiplexing (CO-OFDM) system, wherein key sequences are generated with good…
View article: A Novel MIMO-SAR System Based on Simultaneous Digital Beam Forming of Both Transceiver and Receiver
A Novel MIMO-SAR System Based on Simultaneous Digital Beam Forming of Both Transceiver and Receiver Open
Orthogonal frequency division multiplexing (OFDM) chirp waveform, which is composed of two or more successive identical linear frequency modulated sub pulses, is a newly proposed orthogonal waveform scheme for multi-input multi-output (MIM…
View article: Super-Resolution for MIMO Array SAR 3-D Imaging Based on Compressive Sensing and Deep Neural Network
Super-Resolution for MIMO Array SAR 3-D Imaging Based on Compressive Sensing and Deep Neural Network Open
Multiple-input multiple-output (MIMO) array synthetic aperture radar (SAR) can straightly obtain the 3-D imagery of the illuminated scene with the single-pass flight. Generally, the Rayleigh resolution of the elevation direction is unaccep…
View article: Automatic Regularization of TomoSAR Point Clouds for Buildings Using Neural Networks
Automatic Regularization of TomoSAR Point Clouds for Buildings Using Neural Networks Open
Tomographic SAR (TomoSAR) is a remote sensing technique that extends the conventional two-dimensional (2-D) synthetic aperture radar (SAR) imaging principle to three-dimensional (3-D) imaging. It produces 3-D point clouds with unavoidable …
View article: Orthogonal waveform separation based on echo compression for airborne MIMO‐SAR systems
Orthogonal waveform separation based on echo compression for airborne MIMO‐SAR systems Open
Attention has been devoted to multi‐input multi‐output (MIMO) synthetic aperture radar (SAR) systems in recent years. The applications of MIMO‐SAR systems which involve high‐resolution wide‐swath remote sensing, three‐dimensional imaging, …
View article: Multiple-Bounce Scattering of Tomo-SAR in Single-Pass Mode for Building Reconstructions
Multiple-Bounce Scattering of Tomo-SAR in Single-Pass Mode for Building Reconstructions Open
Building reconstruction is a very important application in SAR tomography in urban areas. Most of the current reconstruction methods are the combinations of the edge-based method and region growing method. Due to the lack of resolutions in…
View article: Synthetic Aperture Radar Interferometry Based on Vortex Electromagnetic Waves
Synthetic Aperture Radar Interferometry Based on Vortex Electromagnetic Waves Open
The vortex electromagnetic (EM) wave carrying orbital angular momentum (OAM) offers a new degree of freedom for synthetic aperture radar (SAR) imaging. Because vortex EM waves have helical wavefronts, the vortex EM wave-based SAR echo cont…
View article: A Novel Orthogonal Waveform Separation Scheme for Airborne MIMO-SAR Systems
A Novel Orthogonal Waveform Separation Scheme for Airborne MIMO-SAR Systems Open
In recent years, multi-input multi-output (MIMO) synthetic aperture radar (SAR) systems, which can promote the performance of 3D imaging, high-resolution wide-swath remote sensing, and multi-baseline interferometry, have received considera…