A5101488772- Advanced SAR Imaging Techniques
- Radar Systems and Signal Processing
- Human Mobility and Location-Based Analysis
- Insect Pheromone Research and Control
- Urban Transport and Accessibility
- Avian ecology and behavior
- Rangeland and Wildlife Management
- Remote Sensing in Agriculture
- Microwave Imaging and Scattering Analysis
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Urban, Neighborhood, and Segregation Studies
- Wireless Signal Modulation Classification
- Advanced Photonic Communication Systems
- Entomological Studies and Ecology
- UAV Applications and Optimization
- Phytoplasmas and Hemiptera pathogens
- Regional Economic and Spatial Analysis
- Parallel Computing and Optimization Techniques
- Advanced Control Systems Optimization
- Antenna Design and Optimization
- Spider Taxonomy and Behavior Studies
- Infrared Target Detection Methodologies
- Speech and Audio Processing
- Transportation Planning and Optimization
- Forest Insect Ecology and Management
Beijing Institute of Technology
2018-2022
Renault (France)
2017
Shanghai Tongji Urban Planning and Design Institute
2015
Insect migration is a significant ecological phenomenon in nature, and difficult to directly observe because insects are small fly hundreds of meters above the ground at night. Radar, working all-weather all-time conditions, remains one most effective tools for observing insect flight. This paper reviews developments radar systems signal processing methods entomology. Typical parameter retrieval presented, including that scanning Vertical Looking Radar (VLR) achieve parameters, such as...
This studyutilized the mobile signaling data to conductthe impact analysis of jobs-housing spatial mismatch on commuting behavior, with eight typical employment centers three categories selected as research subjects. Based characteristics and indictors including distance, accessibilities from cumulative opportunity model etc., this study demonstrates that (a) percentage short distance (e.g., less than 3 km) reflects match between their peripheral areas; (b) combining indicators employed...
Based on the development of industrial structure prefecture-level resource-based cities in Northeast China, this paper selects three indicators structure—diversification, rationalization and upgrading—conducting empirical analysis transformation these cities. The effects same kind are analysed different provinces is compared. It indicates that process adjustment effect structures China were not very satisfactory whole secondary industry was still leading most In addition, article analyses...
Vertical-looking radar (VLR) is a significant milestone in the development of insect radars with capability detecting behavior migratory insects and their biological parameters. In current VLRs, high-speed continuous sampling long-time integration can barely be performed simultaneously, leading to low detection probability for tiny (weight < 10 mg). Based on large amount data acquired by our developed high-range resolution radar, echo signals vertical motion characteristics are initially...
The use of radar to monitor insect migration is great significance for pest control and biological mechanism research. However, migrating insects usually have small radar-cross-section (RCS) are accompanied by maneuvering. current detection algorithms mainly contradictions in performance computational complexity. So it difficult traditional detect them effectively. Hence, a novel coherent integration algorithm based on dynamic programming (DP) fractional Fourier transforming (FrFT) proposed....
The observation of taking-off and landing behaviors migratory insects is important for pest early monitoring forecasting. Entomological radar, which can measure the ascent or descent rates remotely, has been proved to be most effective way observe above behaviors. For current entomological radars, highest range resolution 7.5 m smallest blind 150 make it difficult distinguish individual in a swarm at low altitudes. In this paper, based on outfield data acquired from high-resolution radar 0.2...
Entomological radars need to address the problem of insect density estimation. Here, a Ku-band experimental entomological radar with two-dimensional scanning mode is used collect echo data. The nearest neighbour method associate traces same insect. Then, insects are classified according their cross-sections (RCSs) and heights. corresponding radar-effective sampling volumes calculated. So, we can get different RCSs at any height layer. Finally, densities layer accumulated obtain total each
The wing-beat frequency is one of the most important behavioural parameters migratory insects and widely used to distinguish insect species due diversity among different species. Traditional radar has been able achieve automatic extraction frequency. However, its low-range resolution fixed threshold detection may cause false alarms reduce precision authors' Ku-band system enables high-resolution, full-polarised insects, but not achieved yet. authors propose an algorithm based on a system....
This study introduces a novel insect speed extraction method based on high resolution and full polarisation radar with vertical-looking mode. The echo model of the is first established. Then, an iterative algorithm for estimating horizontal insects derived second-order polynomial approximation. Finally, experimental results show effectiveness feasibility this in extracting insects. Compared traditional method, here more simple effective greatly reduces computation.
Entomological radars are important for scientific research of insect migration and early warning migratory pests. However, insects hard to detect because their tiny size highly maneuvering trajectory. Generalized Radon–Fourier transform (GRFT) has been proposed effective weak target detection by long-time coherent via jointly motion parameter search, but the heavy computational burden makes it impractical in real signal processing. Particle swarm optimization (PSO) used achieve GRFT fast...
Aiming at the multi-stage PRI box method has a fixed overlap rate and cannot adapt to different range jitter signals, resulting in low sorting accuracy. This paper proposes signal algorithm based on adaptive overlap. Firstly, combines AP DBSCAN clustering results achieve presorting. It uses five kinds of overlapping boxes calculate peak threshold, then improves search tolerance mechanism determine value. Determine controversial by redefining rate. The simulation show that accuracy reaches...
Entomological radar is a specially designed instrument that can measure the behavioral and biological characteristics of high-altitude migrating insects. Its application great significance for monitoring, early warning, control agricultural pests. As an important component local migratory biomass, insects fly in air during day night. The fully polarimetric entomological was carefully with all-day, all-weather, multi-function measurement capabilities. measures mass single insect based on...