Yayun Cheng

Yayun Cheng
Harbin Institute of Technology | HIT · School of Electronic and Information Engineering

PhD

About

39
Publications
3,978
Reads
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229
Citations
Introduction
My research interests include millimeter-wave and terahertz imaging, polarization imaging, multi-source image processing, physical-based information retrieval.
Additional affiliations
June 2021 - present
Harbin Institute of Technology
Position
  • Professor
January 2019 - May 2021
Tsinghua University
Position
  • PostDoc Position

Publications

Publications (39)
Article
Full-text available
Polarimetric passive millimeter-wave (PMMW) measurements can provide additional information about scenes. We report on the development of a 94GHz Multi-Polarization Scanning Imaging Radiometer (MPSIR) for outdoor imaging applications, and the polarization characteristic analysis of experimentally acquired images. The imager angular resolution is me...
Article
Full-text available
Passive millimeter and terahertz wave imaging has become a significant potential technique for human security check and scene monitoring. Due to the small difference of the brightness temperatures between human body and concealed objects, the temperature sensitivity and spatial resolution of radiometers are always the key performance indexes which...
Article
Full-text available
Passive millimeter-wave (PMMW) imaging has been used for several close-range applications such as personal security checks, scene monitoring, and so on. PMMW images contain a variety of types of image edges which represent intensity discontinuities. As a special edge, an object contour edge is an important feature for object detection and recogniti...
Article
Full-text available
Passive millimeter-wave and terahertz (MMW/THz) imaging is a significant technique used in personal security inspection and scene surveillance. However, a human body generally generates an obvious reflection on the floor, which may have negative influences on target detection and observer vision. In this article, we present a physically based metho...
Article
Full-text available
Passive millimeter and terahertz wave imaging is a powerful way for personnel security inspection and scene monitoring. The existing systems usually have a single polarization mode. To obtain more information, polarimetric imaging has been preliminarily explored recently. However, there is no work exhibiting high-performance polarimetric imaging to...
Article
Radio frequency interference (RFI) has become an increasing and challenging problem in microwave interferometric radiometry (MIR). Accurate localization of RFI sources is helpful to provide location information for switching off unauthorized transmitters causing RFI and mitigating the impact of these RFI sources. In this paper, we propose a new RFI...
Article
Full-text available
This paper focuses on vessel detection through the fusion of synthetic aperture radar (SAR) images acquired from spaceborne–airborne collaborative observations. The vessel target detection task becomes more challenging when it features inshore interferences and structured and shaped targets. We propose a new method, based on target proposal and pol...
Article
Radio frequency interference (RFI) seriously deteriorates the quality of the retrieval of geophysical parameters, e.g., Earth surface moisture and ocean salinity, measured in microwave interferometric radiometry (MIR). The accurate detection of RFI sources is crucial for locating these illegal sources and mitigating their impact. In this article, w...
Article
Radiometric sensitivity is crucially important for microwave interferometric radiometers. To pursue optimum performance of radiometric sensitivity, the minimum/low-degradation arrays (MDAs/LDAs) are usually employed. In the paper, we propose a deterministic method for designing low-degradation linear arrays (LDLAs), which exploits the multiple-fold...
Article
Full-text available
Ship detection by an airborne passive interferometric microwave sensor (PIMS) has been proposed as a powerful complementary tool for ship detection, especially for large ships in low visibility conditions and high sea clutter. In this paper, the brightness temperature (TB) models of the sea background and the ship on the sea are established. Given...
Article
Full-text available
Sea surface salinity (SSS) in coastal zones with high temporal and spatial resolutions is also needed to scientific research and marine economy. However, one of the limitations of airborne L-band real-aperture microwave radiometers and synthesis aperture interferometric radiometers (SAIR) is high mass and volume or the high complexity of the system...
Article
Full-text available
Millimeter-wave (MMW) radiation characteristic has been used in object classification and recognition. Complex permittivity is a key factor affecting the radiation characteristic. Previous study has shown that estimation values of complex permittivity based on multipolarization measurements spread around a special curve (called "C-curve"). In this...
Article
Full-text available
Polarization-based passive millimeter-wave imaging has been applied in several applications, including material clustering, pattern recognition, and target detection. We present here a general formulation of a metal target detection method called dual linear polarization discriminator (DLPD), utilizing passive millimeter-wave polarimetric imagery....
Article
We report on terahertz (THz) detectors with a high performance at room temperature using EuBiTe3 crystals as the active material under mechanisms of bolometric and photothermoelectric effects (PTE). Our detectors have a simple structure and can achieve high sensitivity, even without a coupling antenna and optimization of the thermal environment. Un...
Article
Surface normal vector is essential for object recognition and three-dimensional reconstruction. This article establishes a passive millimeter-wave polarization observation model of object thermal radiation. Then, a polarization-based method is proposed to acquire the surface normal vector from multipolarization measurements. The simulation results...
Article
Passive millimeter-wave (PMMW) sensing has been used for several close-range applications such as scene monitoring and security check. Aiming to sense man-made or natural dielectrics, we report the estimation characteristics of complex permittivity by multi-polarization measurements. According to the polarization brightness temperature (TB) model,...
Article
Full-text available
When using traditional methods to measure the microwave/ millimeter-wave emissivity of small targets, errors arise due to that the antenna’s main lobe and side lobe cannot be completely covered by the target. To eliminate the errors exist in traditional measurement methods, this paper first analyzes the main sources of errors and gives the analytic...
Article
Full-text available
Passive millimeter-wave imaging has emerged as a useful tool in many remote sensing applications, including resource re-mote sensing, material classification and target detection. This paper presents a method to classify specular objects based on their material composition from passive millimeter-wave polarimetric imagery. Passive Degree of Polariz...
Article
Full-text available
Aperture synthesis radiometers measure the visibilities of the scene under observation by antenna array; and based on these visibility measurements, inverse algorithm is employed to reconstruct the brightness temperature (BT) of the observed scene. The instrument model plays a key role in the inverse problem, and its error will degrade the reconstr...
Article
Full-text available
Polarimetric measurement can gain more object information when compared to traditional methods. Linear polarization ratio (LPR) of the millimeter-wave thermal emission has been presented recently and proved to be effective in material classification. The LPR classification technique can be used for the metal detection in the soil and concrete groun...
Article
The presence of radio frequency interference (RFI) sources emitting in the L-band, which is reserved for passive measurements by International Telecommunications Union (ITU) regulations, has seriously deteriorated the data quality of many brightness temperature (BT) snapshots in the Soil Moisture and Ocean Salinity (SMOS) project. In order to obvia...
Article
For aperture synthesis radiometers, sparse samplings on the u-v frequency plane cause undesirable sidelobes in the synthesized beam. Through these sidelobes, artificial sources emitting in the protected 1400–1427 MHz band contaminate the retrievals of the soil moisture and ocean salinity (SMOS) from MIRAS measurements. One effective way to correct...
Article
Full-text available
The polarization properties of thermal millimeter-wave emission capture inherent information of objects, e.g., material composition, shape, and surface features. In this paper, a polarization-based material-classification technique using passive millimeter-wave polarimetric imagery is presented. Linear polarization ratio (LPR) is created to be a ne...
Article
To achieve radar and infrared stealth, an infrared stealth layer is usually added to the radar absorbing material (RAM) of stealth aircraft. By analyzing the millimeter-wave (MMW) emissivities of three stealth materials, this Letter investigates the impact of the added infrared stealth layer on the originally "hot" MMW emission of RAM. The theoreti...
Article
The millimetre-wave (mmW) linear polarisation property of a typical stereoscopic object is investigated theoretically. The mmW brightness temperatures (BTs) of the target at different linear polarisations are simulated using ray tracing. Based on the distribution characteristics of linear polarisation images, a linear polarisation fusion (LPF) meth...
Article
Full-text available
Surface orientation information is essential to depicting the 3-D structure of an object. This paper analyzes the linear polarization characteristics of several typical objects by simulations and measurements. Then, a polarization-based method is presented to acquire the object surface orientation information from three different linear polarizatio...
Conference Paper
Full-text available
An accurate geolocation of the radio frequency interference (RFI) sources is significant to effectively switch off illegal transmitters. In this study, utilizing the sparse property of RFI in the observed scene, a super-resolution RFI localization method based on compressive sensing is presented in synthetic aperture interferometric radiometer (SAI...

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Projects

Projects (4)
Project
To get object information from PMMW image.
Project
According to the route of “mechanism → model → property → method”, the project introduces “polarization” to conduct the focused research on the polarization characteristics of millimeter-wave radiation from human and concealed objects, and then explores the enhancement method of concealed objects.
Project
Aperture synthesis is effectively applied in remote sensing and threat detection. But problems still exit to get better images. When used in security detection, problems arise on the design of the synthetic aperture system or imaging method for high resolution. When used in remote sensing, RFI likes a flood making valuable information drowned in the trail. So solving the problems above is the goal.