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With the development of VLBI technology, the correlator system of observation station is constantly upgrading, so as to adapt to new data format and higher processing speed. Now the conversion of data format from Mark 5B to VDIF has been built by the researchers around the world. Once completed, it will be conducive to VLBI international collaboration. Hence it is very meaningful to study the VDIF...
As the development of people's pursuit for driving experience, atmosphere lamp is increasingly used in automobile interior lighting. How to accurately control and change the color of atmosphere light becomes an urgent problem. In addition, any electronic system applying in automobile must go through strict ESD test to make sure that system can work stably in the real environment. In this paper, a...
Transient electromagnetic (EM) scattering by conducting-dielectric objects is formulated by time-domain electric field integral equations (TDEFIEs). The TDEFIEs are usually solved by combining the method of moments (MoM) in space domain and march-on-in-time (MoT) scheme in time domain. The space-domain MoM requires two basis functions to represent the electric and magnetic current densities on material...
Intelligent patrol based on aircraft can avoid the inconvenience of traditional manual inspection and has become a new inspection method for transmission lines. In order to eliminate the influence of illumination on the inspection images and improve the accuracy of fault identification, various enhancement algorithms are tested and compared and a proper enhancement algorithm is proposed for transmission...
This paper firstly designs a set of tunnel safety pre-warning scheme. According to the detection convergence value and sedimentation value of tunnel section, we judge the safety of the tunnel. Tunnel safety pre-warning scheme can be divided into three broad categories: security, warning and risk. Then, a visualized system for monitoring tunnel's risk is followed with the tunnel safety pre-warning...
In this paper a dipole-type RFID tag antenna is proposed and it can be used to detect the mechanical deformation of an object. When the tag antenna is attached to an object, the mechanical deformation of the object and the patch antenna will contribute to the frequency deviation. So we can research and test the impact of mechanical deformation of the RFID tag antenna on its resonant frequency to monitor...
Electromagnetic problems with both conducting and dielectric media are formulated through volume-surface integral equations (VSIEs) in integral equation approach. The conducting part is described by surface integral equation while the dielectric part is governed by volume integral equations (VIEs) and they are coupled together by produced fields. The VSIEs are usually solved by the method of moments...
Solving electromagnetic (EM) scattering with very thin conducting objects by integral equation approach have to deal with some unfavorable problems, such as a large dynamic change of current density in the neighborhood of their edges and many low-quality meshes on the side faces of objects in geometric discretization, which makes the accurate evaluation of singular integrals in matrix elements significant...
Volume Integral Equations (VIEs) are indispensable for electromagnetic (EM) analysis by integral equation approach when inhomogeneous penetrable objects are involved. In the conventional method of moment (MoM) for solving the VIEs, unknown functions are expanded by a well-designed basis function like Schaubert-Wilton-Glisson (SWG) basis function, and a tedious testing procedure is required to transform...
The fast multipole algorithm (FMA) has been thought of as one of top ten algorithms in science and engineering in the 20th century and its multilevel variant (MLFMA) was first proposed in electromagnetics. The memory usage and CPU time for solving a dense matrix equation iteratively are of O(N2) complexity, where N is the number of unknowns, and this cost usually prevents one from solving large-scale...
Transient electromagnetic scattering by dielectric objects is formulated through time-domain Poggio-Miller-Chang-Harrington-Wu-Tsai (TDPMCHWT) equations which are usually solved by combining the method of moments (MoM) in space domain and march-on-in-time (MoT) scheme in time domain. The space-domain MoM requires two basis functions to represent the electric and magnetic current densities, respectively,...
In this paper, a novel low-profile RFID antenna is proposed. Based on original microstrip patch antenna, the tag antenna adopts a shorted stub and H-shape slot. Implementing a shorted stub can easily match the impedance of RFID chip. Using H-shape slot increases the length of current path on patch, miniaturizing the tag antenna. The size of the proposed antenna is 62 × 18 × 0.79mm3 and its simple...
RFID has been widely used around the world and it is necessary and effective to lower the cost of RFID by removing inside chip. A novel frequency-coded chipless RFID tag is presented in this paper. It encodes data into the spectral characteristic by spiral resonators with different structures. The tag with six resonators can produce totally 64 IDs and each tag has its unique ID decided by unique size...
Metallic dampers in the bridge structures will suffer from a certain degree of deformation leading to a damage or destruction. To assess the deformation of metallic dampers and to decide whether to replace, a passive wireless strain sensor is needed. In this paper, we propose a scheme to design the passive wireless strain measurement system. We first investigate the possibility that a folded patch...
With the rapid development of intelligent monitoring today, we have applied numerous sensors in monitoring the target area, but the problem of energy consumption has always been difficult to solve. Because of the large number of wireless sensor network node, the supplement of node energy trapped, so it's imperative for us to consider the design of low-power system. In this paper, we used the PSoC4...
The 120-type braking device is an important equipment which offered emergency braking and safety deceleration when train run on tracks. Testing and investigating the performance of 120 air-control valve is a fundamental requirement for the train's safety. Experiment in the real railway operation lines brings lots of inconvenience to the research and development of new products. In order to reduce...
The main components of a cellphone camera are camera lens, color filter, voice-coil motor, motor drive and imaging sensor. Imaging sensor and motor drive both are ESD sensitive COMS semiconductor devices, the camera will lose its efficiency if under protection or operated mistakenly. Common malfunctions are unable to preview, motor fails to focus, I2C communication failure and abnormal heating. Therefore,...
In the field of radio astronomy, CLEAN algorithm is in constant development. In order to solve the problem of distortion of the image under some conditions, we propose a modified CLEAN algorithm, so that the result map is smooth and the resolution has been improved.
The pressure sensor currently used in domestic rail transport industry has a poor compatibility with its media, causing a large temperature drift. Such a sensor usually fails to meet the application requirements of diesel locomotive measuring environment with multiple media and small volume. In order to meet the requirements of the diesel locomotive, this paper conducts a deep analysis on the piezoresistive...
Electromagnetic (EM) problems with complex media are formulated by volume integral equations (VIEs) in the integral equation approach. The VIEs are usually solved by the method of moments (MoM) with the Schaubert-Wilton-Glisson (SWG) basis function, but the solution requires high-quality conforming meshes, resulting in a high cost in geometric discretization. In this work, a point-matching meshless...
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