The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Dense prediction is concerned with predicting a label for each of the input units, such as pixels of an image. Accurate dense prediction for time-varying inputs finds applications in a variety of domains, such as video analysis and medical imaging. Such tasks need to preserve both spatial and temporal structures that are consistent with the inputs. Despite the success of deep learning methods in a...
Plenty of existed tactile displays in the literature had limited application due to their small effective contact area of end-effector or touched surface. In this paper, a tactile display with large-effective contact area for texture perception was proposed. It could create texture sensation within an active area of 194mm × 100mm based on squeeze film effect. Furthermore, this tactile display was...
MIMO (Multiple-Input Multiple-Output) radar is a new radar system, which can provide more observation channels than traditional array radar with the same number of the array elements. Based on far-field approximation, the usual MIMO array will lead to high azimuth grating lobes in near-field imaging. For designing near-field imaging MIMO array, this paper analyzed the reason of the grating lobes in...
Radar network has important application in many fields, such as small target detection etc, especially for the case with wide baseline. Until now, the research to the 3-dimensional (3D) target localization accuracy using radar network is still a research focus in the radar community. In this paper, further research to the radar network with aerial and ground-based nodes is carried out, and the analytical...
Beidou-2/Compass-2 inclined geosynchronous orbit satellites have short revisit time, which provides possibility for bistatic SAR differential interferometry application. But the orbit is not accurately repeated and the baseline grows with the time, which can result in deteriorating spatial coherence coefficient and may invalidate the tradition differential interferometry method. In order to implement...
Integration of different genomic profiles is challenging to understand complex diseases in a multi-view manner. Computational method is needed to preserve useful information of data types as well as correct bias. Thus, we proposed a novel framework pattern fusion analysis (PFA), to fuse the local sample patterns into a global pattern of patients with respect to the underlying data, by adaptively aligning...
The detection of secondary structure of proteins using three dimensional (3D) cryo-electron microscopy (cryo-EM) images is still a challenging task when the spatial resolution of cryo-EM images is at medium level (5–10Å). Prior researches focused on the usage of local features that may not capture the global information of image objects. In this study, we propose to use deep learning methods to extract...
This paper proposes a mainlobe interference suppression method based on whitening filter for distributed array radar (DAR). Due to the equivalent large aperture of DAR, it is possible to cancel the mainlobe interference without target signal suppression. For narrowband signal, the time domain whitening filter (TD-WF) is used. As for the wideband signal or large aperture DAR, the target signals arriving...
In ground-based frequency modulated continuous wave (FMCW) synthetic aperture radar (SAR) images, false targets caused by coupling signal may appear. Traditional digital cancellation methods cannot estimate reference cancellation signal in real-time. A new method based on singular value decomposition (SVD) to suppress radar coupling signal is put forward. In slow time coupling signal is changeless...
This paper proposes a novel manipulated rotating polarization switched quadrature phase shift keying (MR-PS-QPSK) technique, and correlated constant modulus algorithm (CMA). The latter utilizes the correlation between PS-QPSK symbols in X/Y polarizations to lock the phase of outputted X/Y signals. Then the X/Y signals are merged according to recovered switching bit, which suppresses the noise and...
Distributed array radar is a significant radar system, which can not only improve radar detection capability and measurement accuracy, but also suppress mainlobe interference effectively. However, due to its equivalent large aperture, the plane wave assumption fails. What's worse, target signals arriving at each array may have the envelope migration problem, thus the traditional adaptive beamforming...
Conventional synthetic aperture radar (SAR) and inverse SAR (ISAR) techniques need long integration time, i.e. 1 second or more, to get the high azimuth resolution. Radar network with widely separated transmitters and receivers has the ability to simultaneously acquire the high range resolution profiles (HRRPs) from different angles and thus has the potential to reconstruct the target image by combining...
The tropospheric time variance within the ultra-long integration time of Geosynchronous Synthetic Aperture Radar (GEO SAR) needs to be considered for imaging. Meanwhile, because of the curved trajectory and the very complex geometry relationship between the target position and the satellite, the traditional analysis method of troposphere on low earth orbit (LEO) SAR imaging will no longer be suitable...
Monitoring of the Bohai sea ice is of great importance to prevent sea ice disasters and to better arrange and plan offshore activities. Level ice thickness distributions in the Liaodong Bay in winter 2012–2013 were investigated in this paper using MODIS night-time thermal infrared imagery and ice surface heat balance equation. Weather forcing data was from the European Centre for Medium-Range Weather...
SAR data and its texture features are used to estimate the ice thickness over Liaodong Bay with ice model thickness. Sea ice and open water discrimination works well for dual-polarized data using a simple linear model. For ice thickness estimation the number of data points is too limited, but relatively good estimates can be extracted using the leave-one-out approach. The leave-one-out ice thickness...
GF-1 is the first satellite of this Chinese civilian remote sensing satellites series. This paper presents some typical applications on marine environmental monitoring with high resolution and wide swath satellite data, especial on the marine disaster monitoring such as oil spill, sea ice, and red tide. With these data, we can get the detailed information about different disaster.
Control-oriented models for Variable Geometry Turbochargers (VGT) typically calculate the turbine power based on isentropic assumptions with a fixed or a map based value for the turbocharger mechanical efficiency. While the fixed efficiency assumption is an obvious over simplification, the map based approach, on the other hand, may not be globally accurate due to the need for interpolation between...
The concentricity alignment error between the electromagnet yoke and the suspended coil is one of the key undetermined sources of Planck constant measured by Joule Balance NIM-2. Firstly, three capacitance sensors are mounted on the frame of the suspended coil with 120° equal angular distribution to measure the concentricity alignment errors. Secondly, the theoretical model of the concentricity alignment...
Alignment error is a common system error existing in joule balance and watt balance for measuring the Planck constant. This paper presents the analysis and measurement of alignment error caused by horizontal ampere forces and magnetic torques. The cause of the horizontal forces and torques are discussed, and the solving model of them is established. After that, to decouple the mixed forces and torques,...
This paper describes a coplanar capacitive sensor that is developed for joule balance to measure the horizontal displacement of suspended coil. Three sensors of this type are arranged at 120° intervals around the suspended coil. This sensor shows the sensitive of 0.012pf/mm with 0μm resolution through the experiment.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.