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.
Video Synthetic Aperture Radar (ViSAR) is a novel technique to continuously monitor moving targets in the interested area. From the video echo provided by the ViSAR system, the motion trail of the moving target can be easily obtained. Therefore, the echo of the moving target should be carefully studied, which is important in practical application for moving targets tracking in ViSAR system.
Multi-rotor UAV is a popular platform for low-cost SAR system because it has small volume, lightweight and flexible motion. However, due to complicated flight trajectory and low-accuracy motion sensor, autofocus in SAR processing becomes a challenging problem. In consideration of the characteristics of multi-rotor UAV SAR, this paper proposes an autofocus algorithm based on improved Mapdrift technology...
The manufacture of focal plane APD array becomes the fundamental limitation of array LIDAR. To overcome the bottleneck, a novel focal plane array LIDAR mechanism by applying multiple-access coding technique is proposed. Encoding, multiplexing and digital decoding are the essential modules added to this LIDAR system. The structure and principle of this LIDAR system is presented. The experiment indicates...
With the continuous improvement of the SAR resolution, image formation signal processing becomes a challenging problem. In this paper, image formation signal processing including image formation algorithm, motion compensation and autofocus are discussed. Processing results of real data collected by an ultra-high resolution SAR are presented to verify the effectiveness of the proposed method.
In this fast developing world, the number of motor vehicles is increasing rapidly but road resources remain limited, causing severe congestion problem of city traffic. In order to predict short-term traffic condition accurately, we propose a short-term traffic condition prediction method for urban road network based on improved support vector machine. As outliers inevitably exist in collected traffic...
The Doppler shift effect results in some targets shadows in theirs actual position, and a strong correlation exists between adjacent frames of Video Synthetic Aperture Radar (VideoSAR) imagery. Based on the above rationale, a novel approach to moving targets shadow detection for high-frame-rate VideoSAR imagery sequence is presented. First, a fast preprocessing stage is essential in real applications,...
It is crucial for cellular data network operators to understand the service quality perceived by its customers. The state-of-art systems deployed in cellular networks mostly report service quality aggregated on cell site level, which is typically an aggregation of tens or hundreds of customers depending on the locations of the cell sites. In this paper, we propose to enhance the measurement of customer-perceived...
Node similarity refers to the link probability in complex network. Higher value signifies their strong possibilities for interlinkages. In this paper, four techniques were tested for node similarity evaluation including CN (common neighbor), RA (resource allocation), AA (Adamic-Adar) and Sorenson algorithm on several real and simulated networks. AUC (Area Under the Curve) was set to compare their...
Video Synthetic Aperture Radar (ViSAR) is the new application of SAR technique. Through reasonable system parameter design, ViSAR system can obtain the SAR image at a faster image rates (also referred to herein as frame rate) which permit the detection of dynamic changes that are occurring in the target scene. Therefore, frame rate as one of the core parameters of ViSAR system should be carefully...
This paper presents a simulated annealing algorithm that based on multiple search neighborhoods to solve a special kind of timetable problem. The new algorithm also can solve those problems that can be solved by local search algorithm. Various experimental results show that the new algorithm can actually give more satisfactory solutions than general simulated annealing algorithm can do.
Metamaterial with multiple applications have been widely studied recently. In this paper, we propose a novel unique metamaterial. The transmission and reflection characteristics of this metamaterial is presented. This metamaterial has a broad transparent band and several absorptive bands. The transparent band is between two neighboring absorptive bands. This metamaterial can be applied in antenna...
Providing high end-to-end (E2E) performance is critical for cellular service providers to best serve their customers. Detecting and localizing E2E performance degradation is crucial for cellular service providers, content providers, device manufactures, and application developers to jointly troubleshoot root causes. To the best of our knowledge, detection and localization of E2E performance degradation...
Since the apoptosis protein plays an important role in understanding the mechanism of programmed cell death, so further to reveal the mechanism of subclass for apoptosis can bring more insights to their function. Here, our group established a dataset included 239 anti-apoptosis proteins and 222 pro-apoptosis proteins in our previous work. The extraction of information based on sequence information,...
A broadband annual dielectric loaded cylindrical dielectric resonator Antenna (ADLCDRA) is designed and analyzed in this paper. The proposed antenna has a simple structure of two parts providing the monopole-type radiation pattern. It has a wide impedance bandwidth of 55% covering the frequency range from 0.71 to 1.25GHz and has a low profile of 0.173 λ0 (λ0 is the wavelength of the center frequency).
In this paper, with the application of dielectric resonator antennas(DRA), a novel design of a shared-aperture dual-band dual-polarized (DBDP) array working in the Ka/Ku bands is proposed. At Ka-band, aperture-coupled microstrip patches are selected as the radiating elements. At Ku-band, Crossed dielectric resonator antennas(DRA) are selected as the radiating elements. The array which comprises 2×2...
A novel dual-polarized dielectric resonator antenna with two groups of differential feeding networks is presented. By using this feeding way, the port isolation[6] of 28 dB and the cross-polarization level of 35 dB are got. Since its feeding network is symmetric, a symmetric radiation pattern is achieved. The simulated −10-dB impedance bandwidth is 13% (2.3–2.6GHz) for the WLAN application.
A supporting system-frame beam with pre-stressed anchor is widely applied to the reinforcement of slope. The force mechanism of frame beam is the priority among priorities in the system design work, since it plays an important role in the system. Based on the actual project cases, we compare the data measured in these cases and the results of the different methods of calculating on the internal force...
Based on the analysis of the main issues, which include the basic problems, the main characteristics and the bottleneck troubles, in SoS (System of Systems) research field, we conjecture that we should change the SoS traditional study methodology based on reductionism. We, therefore, propose a new method, named SoSO (SoS Ontology), via keeping the essential concept of SoS, using technology of ontology,...
In the log interpretation, it is an important task to research difference of the logging signal of different reservoir with mathematics comprehensively and accurately, so as to identify the fluid property of reservoir. The statistical trait of logging data can be reflected fully by its autocovariance function. In this paper, the sample autocovariance functions of the logging data of the oil-layer,...
Reduced-dimension space-time adaptive processing (STAP) techniques are good choices in multichannel wide-area surveillance airborne systems to suppress ground clutter. However, their performance often degrades in nonhomogeneous environments due to the inaccurate estimation of the interference covariance matrix from the secondary data. In this paper, combing with Kalman filtering, we propose a novel...
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.