A5100687942- Advanced SAR Imaging Techniques
- Radar Systems and Signal Processing
- Direction-of-Arrival Estimation Techniques
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Precipitation Measurement and Analysis
- Microwave Imaging and Scattering Analysis
- Radio Wave Propagation Studies
- Sparse and Compressive Sensing Techniques
- Geophysical Methods and Applications
- Underwater Acoustics Research
- Optical Systems and Laser Technology
- Meteorological Phenomena and Simulations
- Soil Moisture and Remote Sensing
- Target Tracking and Data Fusion in Sensor Networks
- Indoor and Outdoor Localization Technologies
- Advanced Image Processing Techniques
- Planetary Science and Exploration
- Speech and Audio Processing
- Antenna Design and Optimization
- Geophysics and Gravity Measurements
- Atmospheric aerosols and clouds
- Atmospheric and Environmental Gas Dynamics
- Robotics and Sensor-Based Localization
- Remote Sensing in Agriculture
- Image Processing Techniques and Applications
Nanjing University of Aeronautics and Astronautics
2015-2024
Dalian University of Technology
2024
Jinan University
2024
ShenZhen People’s Hospital
2024
Southern University of Science and Technology
2024
Shanghai University
2023-2024
Xi'an Jiaotong University
2023
Harbin Institute of Technology
2006-2022
Shanghai Shipbuilding Technology Research Institute
2022
Ministry of Industry and Information Technology
2019-2021
Importance For patients with non–small cell lung cancer whose disease progressed while receiving EGFR tyrosine kinase inhibitor (EGFR-TKI) therapy, particularly third-generation TKIs, optimal treatment options remain limited. Objective To compare the efficacy of ivonescimab plus chemotherapy alone for relapsed advanced or metastatic epidermal growth factor receptor ( ) variant. Design, Setting, and Participants Double-blind, placebo-controlled, randomized, phase 3 trial at 55 sites in China...
Barrage jamming technique with controllable coverage against synthetic aperture radar (SAR) systems is of great importance in electronic countermeasures. However, it still a difficulty for the jammer to accurately impose two-dimensional (2-D) local on regions interest (ROIs). In this respect, new parameterized and large-dynamic-range precise (PLDR-PC) method has been proposed paper assist solving such problems. Based SAR imaging properties linear frequency modulation (LFM) case, range...
The problem of echo separation using digital beamforming (DBF) on receive for multiple-input multiple-output (MIMO) synthetic aperture radar (SAR) is notable importance to allow practical systems. Regrettably, current DBF-MIMO-SAR schemes, such as the short-term shift-orthogonal (STSO) scheme, are computationally cumbersome, increasing required hardware complexity. To alleviate this problem, we here propose an improved solution realizing a low-cost MIMO-SAR system. We detail generic waveform...
The echo separation issue for multiple-input multiple-output (MIMO) synthetic aperture radar (SAR) is usually regarded as a more technical challenge. Spotlighted promising solution to the separation, well-known short-term shift-orthogonal (STSO) beamforming scheme has become increasingly popular. However, airborne MIMO SAR systems, digital (DBF) involved in STSO encounters issues, e.g., direction of arrival (DOA) mismatch induced by topography variation. Up now, relatively less research on...
In this paper, a new blind video watermarking algorithm is proposed based on the singular value decomposition. The watermarks can be detected without original or any other information of values. Experiments show that bears desirable robustness MPEG-2 compression, median filtering, small rescaling, and rotation, etc
Barrage jamming technique against spaceborne synthetic aperture radar (SAR) systems plays an important role in electronic countermeasures. Generally, it is crucial for the jammer to obtain a satisfactory SAR image corrupting performance with both low computational burden and transmitting power. In this respect, knowledge-aided precise has been proposed cope involved technical challenges. our work, generation of signal two-dimensional (2-D) controllable coverage high coherent integration gain...
To overcome the deterioration of azimuth resolution in forward-looking imaging for airborne or missile-borne radar, this paper proposes an array radar algorithm based on super-resolution technique. In novel proposed algorithm, modified Multiple Signal Classification (MUSIC) is applied to estimate positions observed targets, followed by signal accumulation generate final image. As verified simulation and experimental results, can effectively improve image direction.
This study introduces a new type of space–time autoregressive (STAR) filtering algorithm for adaptive processing (STAP) operating in clutter environment that is not strictly stationary slow time. The original STAR approach based on (AR) model, despite enjoying fast convergence rate, suffers significant performance degradation when dealing with non-stationary processes. To remedy this, the proposed invokes 'relaxed' AR is, time-varying (TVAR) and called (TV-STAR) filtering. authors...
An efficient approach to achieve ground moving target indication (GMTI) for synthetic aperture radar (SAR) is use the monopulse-SAR system. In this kind of SAR system, targets are detected over a so called, called monopulse ratio diagram (MRD) generated by pixel-to-pixel comparison between two images acquired from sum and difference channels. The sample derived pixel under test (PUT), i.e. value (MR), employed as statistic. This paper examines statistics MR when complex Gaussian...
In this paper, an efficient direct data domain space-time adaptive processing (STAP) algorithm for moving targets detection is proposed, which achieved based on the distinct spectrum features of clutter and target signals in angle-Doppler domain. To reduce computational complexity, high-resolution obtained by finding sparsest coefficients angle using reduced-dimension within each Doppler bin. Moreover, we will then present a knowledge-aided block-size that can discriminate between extracted...
To overcome the deterioration of azimuth resolution caused by errors monopulse response curve (MRC) in practical processing, this paper proposes an auto-focusing algorithm for imaging technique. By applying iterative steps, automatically extracts echo signals isolated strong scatterers from received data, and employs them to accurately estimate actual MRC. The estimated is then used procedure autofocus image azimuth. As verified simulation experimental results, can effectively reduce impact...
The echo separation solution based on digital beamforming (DBF) in the elevation is quite applicable to multiple-input multiple-output (MIMO) synthetic aperture radar (SAR). For current DBF-MIMO-SAR schemes, however, at least <inline-formula><tex-math notation="LaTeX">$\bm {2M-1}$</tex-math></inline-formula> subapertures must be employed successfully separate aliased signal returns induced by M$</tex-math></inline-formula> simultaneously transmitted waveforms, which essentially increases...
Multi-channel receiving technique has been proved to be a promising approach for synthetic aperture radar (SAR) achieve simultaneous high-resolution and wide-swath (HRWS) imaging. With the support of digital beamforming (DBF) technique, ambiguity-free signal can reconstructed from Doppler aliased data received by along-track channels with high fidelity. However, in practice, key factor that affects precision spectrum reconstruction deteriorates quality final image is inevitable mismatch...
Deep learning (DL) has succeeded in the field of target detection and been introduced into researches ground moving indication (GMTI) for synthetic aperture radar (SAR) recently. Due to lack labeled data SAR/GMTI, simulated are usually employed support training networks, which proved be a feasible way practice. Although some very close real data, fact is that distribution differences between them inevitable always lead performance loss network. Motivated by recent advances transfer learning,...
Traditional space-time (ST) adaptive processing (STAP) theory is based on the assumption of narrowband or "zero-bandwidth," where decorrelation within ST snapshot ignored. However, with radar bandwidths increasing, this becomes invalid due to deteriorated received signals snapshot. The directly causes dispersion in both spatial and temporal domains, leading spreading clutter spectrum 2-D frequency (Doppler-spatial frequency) domain. With spectrum, suppression notch traditional STAP filters...
In this study, the effects of non-sidelooking airborne radar clutter dispersion on space-time adaptive processing (STAP) is considered, and an efficient angle-Doppler compensation (EAADC) approach proposed to improve suppression performance. order reduce computational complexity, reduced-dimension sparse reconstruction (RDSR) technique introduced into spectrum estimation extract required parameters for compensating spectral center misalignment. Simulation results demonstrate effectiveness...
By exploiting the direction of arrival (DoA) information azimuth ambiguity, an innovative algorithm for adaptive suppression ambiguity multichannel synthetic aperture radar (SAR) wide-swath imaging is presented. It firstly estimates DoA value each component within a Doppler cell using efficient noise subspace-based iterative estimation technique. Then spatial filter sequentially extracting desired derived, which designed to be used with newly estimated bin. Finally, ambiguities can...
Monopulse processing has been proved to be an effective way for airborne synthetic aperture radar (SAR)/ground moving target indication. In the monopulse‐SAR system, detection is applied a complex ratio diagram, referred as monopulse diagram (CMRD), generated through pixel‐by‐pixel comparison between range‐Doppler (RD) spectra obtained from difference and sum channels. This study examines statistics of (CMR) in Gaussian background. Based on statistics, new random variable termed normalised...
Range migration algorithm (RMA) is widely exploited for synthetic aperture radar (SAR) imaging and also capable of achieving the optimal performance. In this paper, a modified RMA sake higher computational efficiency proposed. The main steps proposed lie in transforming conventional Stolt mapping into linear form substituting sinc interpolation with principle Chirp Scaling. Consequently, can guarantee fine focusing quality high simultaneously. Simulated measured airborne SAR data processing...
Rational decision making in transport related investment programs greatly depends on the valuation of travel time savings. The primary objective this study is to estimate social value savings (SVTTS) city Nanjing, China. A stated preference (SP) survey was conducted investigate travelers' willingness pay (WTP) for Face-to-face interviews were at stations, shopping centers, schools, and parks different urban districts Nanjing. binary mixed logit models developed. results revealed that random...
In this paper, high-precision joint inversion of evaporative duct based on dual frequency radar sea clutter data is analyzed to study the abnormal environment phenomenon that occurs over offshore surfaces. As information retrieved by radars with different frequencies inconsistent, a optimization model dynamic penalty factor proposed, which can improve degree conformity between measured power and modeled power. Then, parallel crossover quantum particle swarm algorithm used jointly invert...