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    Antenna development in China

    Wen Xun Zhang
    Antennas and Propagation Magazine, IEEE

    Volume: 38 , Issue: 6
    DOI: 10.1109/74.556520
    Publication Year: 1996 , Page(s): 49 - 63

    IEEE Journals & Magazines

    A brief review of the history and geography of antenna developments in China is presented. Aperture antennas and array antennas together with antenna measurements are discussed in particular. Antenna developments in Taiwan, Hong Kong, and Macao are not included View full abstract»

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    ACON's R&D in wireless communications

    Fu-Ren Hsiao ; Bo-Sheng Chen
    Microwave Conference Proceedings (APMC), 2012 Asia-Pacific

    DOI: 10.1109/APMC.2012.6421762
    Publication Year: 2012 , Page(s): 869 - 871

    IEEE Conference Publications

    ACON is a very reliable company in field of electronic components of IT & Communications industry and it pays much attention to new technology development, especially in wireless communication products. Wireless Communications BU. (business unit) is the major division of ACON and it mainly deals with production of antenna, RF connector and cable, wireless module and active component such as LNA (low-noise amplifier). With the advantage of professionalism in Opto-Mechatronics technologies, ACON is in a unique position for customer to provide the integrated solutions with different kind of key components such as antenna, speaker, hinge and plastic housing. ACON has very strong R&D capability in dual-sides of Taiwan and China including experienced RF engineer and complete measuring equipments. Besides, ACON usually keep constant innovation and leads the new spec. for the foresighted antenna product design. Several novel antenna design ideas are presented in this paper. View full abstract»

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    Optimization of Dual-L Antenna Designs for Portable RFID Reader

    Min Yi ; ShuFang Li ; Hongjie Liu ; Weijun Hong
    Wireless Communications, Networking and Mobile Computing, 2008. WiCOM '08. 4th International Conference on

    DOI: 10.1109/WiCom.2008.684
    Publication Year: 2008 , Page(s): 1 - 4

    IEEE Conference Publications

    The development of small integrated antennas plays a significant role in the progress of the rapidly expanding commercial RFID applications. In this paper, a planar dual-L antenna is presented for a dual-frequency band application of portable RFID reader. The antenna can be used over dual frequency of 840 MHz-845 MHz and 920 MHz-925 MHz which is allocated for RFID use in China. Simulation and measurement were performed and the dual-frequency band with a return loss better than -lOdB were achieved. The overall bandwidth of the antenna is increased and the dual-L antenna can be applied to ultra high frequency of 860 MHz-960 MHz that is proposed for RFID use by ISO/IEC. View full abstract»

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    Sub-array Digital Multiple Beamfroming Technology on PowerPc+FPGA Architecture

    Qiu-Fei Yan ; Zhao-Yang Xu ; Zhao Yu
    Network Computing and Information Security (NCIS), 2011 International Conference on

    Volume: 2
    DOI: 10.1109/NCIS.2011.190
    Publication Year: 2011 , Page(s): 420 - 425

    IEEE Conference Publications

    Phased array radar is very important in modern radar development, and sub-array digital multiple beam forming technology is the most significant technology in phased array radar. Digital multiple beam forming on each antenna element about large phased array radar is impossible because it needs so many A/D channels, sub-array digital multiple beam forming method can resolve this problem. This article mainly about, 1.Sub-array digital beam forming and low side lobe methods with radar work on search mode. 2.Sub-array digital beam forming (sum beam, azimuth difference beam, elevation difference beam) and low side lobe methods with radar work on tracking mode. 3. The function implementation of sub-array digital multiple beam forming with Power Pc+FPGA architecture. In this article, when radar work on different mode, there are different low side lobe weight Methods. When radar work on search mode, the low side lobe weight is on each antenna element controlled by digital attenuator embed in T/R module, and when radar work on tracking mode the low side lobe weight is on sub-array channel with digital style. The Power Pc+FPGA architecture used for radar signal processing is pioneer in China, experiment results prove that this architecture is better than other architectures, the whole processing time is less than 1 us. View full abstract»

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    External calibration of the CRS-1 satellite

    Ping Wen Jiang ; Khang Lihong ; Braun, H.M. ; Lentz, H. ; Kicherer, S. ; Borisch, W.
    Computational Electromagnetics and Its Applications, 2004. Proceedings. ICCEA 2004. 2004 3rd International Conference on

    DOI: 10.1109/ICCEA.2004.1459375
    Publication Year: 2004 , Page(s): 395 - 398

    IEEE Conference Publications

    CRS-1 is a SAR satellite in L-Band comprising a phased array antenna. In a cooperation by the Beijing Remote Sensing Institute (BRSI), China, and Radar Systemtechnik AG (RST) in Rorschacherberg, Switzerland, calibration of the CRS-1 active phased array antenna was studied. Both partners were working towards a high performance SAR image product made from the CRS-1 SAR raw data. The paper shows the complexity of calibration under the umbrella of a high performance active on-board array SAR antenna. The calibration uses a new development of an active radar target (ARC) that was specially developed for the purpose. View full abstract»

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    Radio Frequency Identification Walking Stick (RFIWS): A device for the blind

    Saaid, M.F. ; Ismail, I. ; Noor, M.Z.H.
    Signal Processing & Its Applications, 2009. CSPA 2009. 5th International Colloquium on

    DOI: 10.1109/CSPA.2009.5069227
    Publication Year: 2009 , Page(s): 250 - 253
    Cited by:  Papers (9)

    IEEE Conference Publications

    The paper outlines the project undertaken in developing prototype of Radio Frequency Identification Walking Stick (RFIWS). The device intended to assist the blind during walking on a sidewalk. Many of the blind people used the traditional method like dog and old design of walking stick as their guide to walk on the sidewalk. The limitation of this method is the blind people must walk closely to the border of the sidewalk and use the walking stick to find out their current location. This will be exposing the blind to the risk like fallout from the sidewalk. The application of RFID will enhance the conventional method in term of detecting and estimating the distance between the blind and the sidewalk border. The project objective is to develop a walking stick prototype by utilizing Radio Frequency Identification (RFID). A review of assistive technology was presented in this paper together with RFID application in China, France and Thailand. This paper also describes a RFID function and its components explicitly a tag, reader and middleware include a relevant frequency for RFID. The experimental works intended in this project will cover antenna polarization, tag performance, tag orientation sensitivity and tag communication distance for ultra high frequency (UHF). The project also includes development of hardware, software and integration of hardware and software. View full abstract»

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    Communication Antenna Subsystem for the Chinese Satellite DFH-3

    Chang, W. ; Dudok, E. ; Nathrath, N. ; Sommer, E. ; Crone, G.
    Microwave Conference, 1989. 19th European

    DOI: 10.1109/EUMA.1989.334050
    Publication Year: 1989 , Page(s): 699 - 705
    Cited by:  Papers (2)  |  Patents (1)

    IEEE Conference Publications

    The development of a C-Band contoured beam antenna for the coverage of the People's Republic of China is described. The antenna applies two polarisation sensitive reflector shells which are mounted behind each other. The orthogonally gridded reflectos of 2 m diameter are fed by two 7-horn clusters of corresponding linear polarisations, providing both combined transmit (3.7 - 4.2 GHz) and receive (5.925 - 6.425 GHz) functions. Each array consists of diagonal horns followed by waveguide diplexers which are fed by two beamforming networks (Tx and Rx respectively) in coaxial technique (barline). A dual mode transmit network provides two independent input ports. The engineering model of this antenna will be completed in 1989. First breadboard results of the most critical components of the feedsystem are given. View full abstract»

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    Never ending saga of phased array breakthroughs

    Brookner, E.
    Phased Array Systems and Technology (ARRAY), 2010 IEEE International Symposium on

    DOI: 10.1109/ARRAY.2010.5613392
    Publication Year: 2010 , Page(s): 61 - 73
    Cited by:  Papers (4)

    IEEE Conference Publications

    3, 4, 6 face "Aegis" systems developed by China, Japan, Australia, Netherlands, USA. Israel and Australia "Aegis" AESAs have an A/D at every element, a major breakthrough. GaN advancing rapidly. Will be helped by use for PCs, notebooks, cell phones, servers. Extreme MMIC: 4 X-band T/Rs on 1 SiGe chip for DARPA ISIS program; goal <;$10/TR. Raytheon funding development of low cost flat panel Xband array using COTS type PCB. MA-COM/Lincoln-Lab. development of low cost Sband flat panel array using PCB, overlapped subarrays and a T/R switch instead of a circulator. Purdue Un. developing S-band low cost Digital Array Radar; GaN PA and A/D at every element. Revolutionary 3-D Micromachining: integrated circuitry for microwave components, like 16 element Ka-band array with Butler beamformer on 13 × 2 cm2 chip. Ultra low cost 77 GHz radar on 72 mm2 chip together with >8 bits 1 GS/s A/D and 16 element array. Valeo-Raytheon 24 GHz phased array now available for blind spot detection in cars for just $100's. Lincoln Lab using 2 W chip increases spurious free dynamic range of receiver plus A/D by 20 dB JPL's SweepSAR provides wide swath SAR from space with 1/6 th power required by ScanSAR. Metamaterials: 1. Can now focus 6X beyond diffraction limit at 0.38 μm Moore's Law marches on. 2. Used in cell phones to obtain antennas 5X smaller and have 700 MHz-2.7 GHz bandwidth. 3. Provide isolation between closely spaced antennas and antenna elements. View full abstract»

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    On the planning of mf broadcast antennas group

    Wen Xun Zhang ; Anna Wang
    Advanced Technologies for Communications (ATC), 2011 International Conference on

    DOI: 10.1109/ATC.2011.6027443
    Publication Year: 2011 , Page(s): 93 - 97

    IEEE Conference Publications

    Along with rapid development and dilation of the urbanization in China, many existing MF AM-broadcast antennas need to be moved, renewed, and re-built. How to arrange multiple antennas of different frequency channels within a limited field become an important step of overall planning, before their individual design and establishment. In this article, the performances of an antenna under the environment of antennas group are analyzed firstly; and then the optimization method for planning the antennas group is introduced in sequence; and finally several practical applications are discussed. View full abstract»

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    Antenna Research in China

    Zhang, W.X.
    Antennas and Propagation, 2007. EuCAP 2007. The Second European Conference on

    Publication Year: 2007 , Page(s): 1 - 6

    IET Conference Publications

    There have been great change and progress of antenna research and development in China in the past dozen of years. A brief review on huger and electrically-larger antennas, miniature and electrically-small antennas, printed antennas with multi-functions, array antennas with intelligent control, antennas with special materials etc. is presented in sequence. View full abstract»

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    Ionospheric Clutter Suppression in HF Surface Wave Radar OSMAR

    Wan Xianrong ; Xiong Xinlong ; Ke Hengyu
    Antennas, Propagation & EM Theory, 2006. ISAPE '06. 7th International Symposium on

    DOI: 10.1109/ISAPE.2006.353497
    Publication Year: 2006 , Page(s): 1 - 3

    IEEE Conference Publications

    Experimental trials conducted from 2003 to 2005 in east China sea demonstrated that HF surface wave radar (HFSWR) OSMAR (ocean state monitor and analysis radar) could be strongly affected by scattering from ionospheric structures and irregularities. A large database acquired during those trials has been used in detailed investigations of the phenomenology of this ionospheric clutter, leading to the development of effective mitigation techniques based on the characteristics of ionospheric clutter. In this paper the 2-D angle of arrival of ionospheric clutter has been analyzed and the spatial adaptive processing based on 2-D antenna array is introduced to suppress ionospheric clutter. Experimental results confirm that the above technique can achieve effective ionospheric clutter suppression using the field experimental data recorded by the OSMAR2003. View full abstract»

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    System Design of the Prototype Incoherent Scatter Radar at Nanchang University

    Ming Yao ; Liangmin Zhang ; Xiaohua Deng ; Bo Bai ; Wenjun Wu ; Meng Zhou ; Huixia Li ; Ziqing Lu
    Geoscience and Remote Sensing Letters, IEEE

    Volume: 11 , Issue: 1
    DOI: 10.1109/LGRS.2013.2257982
    Publication Year: 2014 , Page(s): 352 - 356

    IEEE Journals & Magazines

    Incoherent scatter radar (ISR) is the only ground-based instrument that can detect space plasma parameters from tens to thousands of kilometers above the earth. The Prototype Incoherent Scatter Radar System of Nanchang University, a versatile space detection radar, will be built at Nanchang University to detect the ionosphere over China in the end of 2013. Software-defined radio (SDR)-based and active phased antenna array are the two most significant features of this radar system. It can probe real time plasma parameters in the altitude range of the ionosphere (80-400 km) according to simulation. The novel ISR introduced in this letter has the advantages of low power, low cost, and modularization. When properly configurated, this system can also carry out coherent scatter detection and wind profile detection. Successful development of such an ISR will resolve the problem of continuous detection of ionospheric electric field and other parameters. This letter introduces the design of this software defined ISR prototype system. View full abstract»

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    The design and implementation of MST radar at Wuhan, China

    Zhengyu Zhao ; Gang Chen ; Chen Li ; Qi Yao ; Guobin Yang ; Chen Zhou ; Yaogai Hu ; Yuannong Zhang
    General Assembly and Scientific Symposium, 2011 XXXth URSI

    DOI: 10.1109/URSIGASS.2011.6050844
    Publication Year: 2011 , Page(s): 1 - 4

    IEEE Conference Publications

    The basic configuration of the Wuhan MST (Mesosphere-Stratosphere-Troposphere) radar, which is currently designed and constructed by School of Electronic Information, Wuhan University, is preliminarily described in this paper. The Wuhan MST radar operates at VHF band preoccupied with the real-time characteristics of turbulence and wind field vector in the height range 1-100km with a high temporal and spatial resolution. The extensive feature of Wuhan MST radar points to the feasibility of low thermosphere if desired. This all solid state, all coherent pulse Doppler radar is the China's first independently development of MST radar focusing at atmospheric observation. The primary subsystems of the Wuhan MST radar include antenna system, feeder line system, all solid state radar transmitters, digital receivers, beam control system, signal processing system, data processing system, product generating system and user terminal. Advanced radar technologies are used, including high reliability all solid state transmitters, low noise large dynamic range digital receivers, active phased array, high speed digital signal processing and real-time graphic terminals. View full abstract»

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    B-1B virtual umbilical demonstration (BVUD)-a low-cost GPS guided weapon system

    Kinstler, G. ; Nielson, J. ; Jacobson, E. ; Crist, T.
    Position Location and Navigation Symposium, IEEE 1998

    DOI: 10.1109/PLANS.1998.670188
    Publication Year: 1998 , Page(s): 395 - 402
    Cited by:  Patents (1)

    IEEE Conference Publications

    Historically, a persistent problem for bomber aircraft has been the accurate delivery of munitions. Targets not initially destroyed require additional passes, at increased risk to both crew and aircraft. For some time, the US Air Force has recognized the need for “smart” tailkits to covert conventional bombs to precision guided munitions (PGM). A little over four years ago, Rockwell International's North American Aircraft Division (now Boeing) began pursuing an inter-divisional effort now called the B-1B Virtual Umbilical Demonstration (BVUD). This effort encompassed the development and demonstration of a GPS guided tailkit that requires no hardware link to the host B-1B bomber for MK-82500 lb. Bombs. All initialization, timing and control data is transmitted to the tailkit over an infrared (IR) link. In addition, the B-1B bomb-bay is modified to re-radiate the GPS L-band signal acquired from an antenna on top of the aircraft. This L-band link as well as the IR data link to each weapon constitutes the “virtual umbilical” since the link is via radio and light waves. The BVUD tailkit was developed and eighteen flight units were built in approximately one year. Testing was completed at Edwards Air Force Base with live drops over the NAWC China Lake bombing range. BVUD has been effectively demonstrated during both captive and live weapon drops. This project is innovative because, to the knowledge of the authors, it represents the first time a virtual umbilical has been used to control a weapon system. The command and control of weapons over an IR link minimizes the need for expensive aircraft modifications to interface with new weapons. The re-broadcast of GPS data within the aircraft bomb bay allows a weapon to track satellites (on P/Y-code), prior to launch. This creates many opportunities for the use of GPS by weapons that could not effectively use GPS because of satellite obstruction during captive carriage or short flight times View full abstract»

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    A vision from the future: beyond 3G TDD

    Ping Zhang ; Xiaofeng Tao ; Jianhua Zhang ; Ying Wang ; Lihua Li ; Yong Wang
    Communications Magazine, IEEE

    Volume: 43 , Issue: 1
    DOI: 10.1109/MCOM.2005.1381873
    Publication Year: 2005 , Page(s): 38 - 44
    Cited by:  Papers (56)  |  Patents (1)

    IEEE Journals & Magazines

    This article introduces the visions and developments of Beyond 3G mobile communications in the China TDD Special Work Group. System structure, radio transmission design, radio resource management, and demonstration system implementation are covered. In system structure, the concept of group cell and the architecture of distributed antennas are introduced. The radio link transmission design presented in this article includes the radio frame structure, multiple access scheme, and promising key techniques. Link-level simulations prove the advantages of the design. The radio resource management strategies are introduced to optimize the system performance. The B3G TDD demonstration system being built by the TDD Special Work Group is also shown finally. View full abstract»

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    A generic simulator for aperture synthesis radiometers

    Camps, A. ; Park, H. ; Barbosa, J. ; Bandeiras, J. ; D'Addio, S.
    Geoscience and Remote Sensing Symposium (IGARSS), 2012 IEEE International

    DOI: 10.1109/IGARSS.2012.6350801
    Publication Year: 2012 , Page(s): 2975 - 2977
    Cited by:  Papers (1)

    IEEE Conference Publications

    ESA's SMOS mission has demonstrated that Synthetic Aperture Interferometric Radiometers can be a useful tool for Earth observation. Today, the NASA's GeoStar instrument (USA), ESA's GAS instrument (Europe), or CSSAR's GIMS instrument (China) are just three examples of planned geostationary millimeter-wave sounders using synthetic aperture interferometric radiometry for continuous atmospheric monitoring with a much improved spatial resolution. The study of the performance in terms of angular resolution and radiometric performance, and the optimization of this new type of instruments is a complex task that requires dedicated ad-hoc simulators. The SAIPRS (Synthetic Aperture Interferometric Radiometer Performance Simulator) is an ESA project aiming at the development of a generic simulator in terms of receiver architecture and array configuration, including moving antennas (and eventually changing polarization reference frames). This work summarizes the key aspects of the architecture of this simulator. View full abstract»

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    Next Generation Information Technology (ICNIT), 2011 The 2nd International Conference on

    Publication Year: 2011 , Page(s): 1

    IEEE Conference Publications

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    Optimal transmit design for miso secrecy-rate maximization with general covariance constraints

    Qiang Li ; Wing-Kin Ma
    Intelligent Signal Processing and Communication Systems (ISPACS), 2010 International Symposium on

    DOI: 10.1109/ISPACS.2010.5704665
    Publication Year: 2010 , Page(s): 1 - 4
    Cited by:  Papers (4)

    IEEE Conference Publications

    The notion of providing secure communication via physical-layer designs has gained much attention in recent studies. This paper considers the transmit covariance design for a generalized secrecy rate maximization (SRM) problem under the scenario of a multi-input single-output channel overheard by multiple multi-antenna eavesdroppers. This generalized SRM design encompasses various existing SRM designs, e.g., the per-antenna power constrained design and the interference temperature constrained design. While the considered generalized SRM problem is nonconvex by nature, this paper shows that the problem can actually be solved in a convex fashion, by recasting the generalized SRM problem as a semidefinite program (SDP). The development of the solution to the generalized SRM shows that transmit beamforming is generally an optimal transmit strategy. Simulation results are also provided to demonstrate the secrecy-rate performance gains of the proposed algorithm over some closed-form, but suboptimal algorithms. View full abstract»

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    Genetic algorithm application in the near-field imaging

    Yuan, V. ; Chan, C.H. ; Man, K.F.
    Antennas and Propagation Society International Symposium, 2002. IEEE

    Volume: 1
    DOI: 10.1109/APS.2002.1016445
    Publication Year: 2002 , Page(s): 722 - 725 vol.1

    IEEE Conference Publications

    Recent development of near-field imaging anticipates promising and fantastic applications such as an ultra high-resolution scanning microscope. The moment method is introduced to the numerical analysis of this problem and the simulated image of a 3D object is presented (see Ishimaru, A., 1991; Morgan., M.A., 1990). A new type of dielectric sensor has been developed to probe the near field without disturbing the field significantly. To determine the relation between the shape of the tip of the sensor and the resolution of the image, a genetic algorithm is employed to search for the optimal parameters which provide the best resolution of near-field images. The best image has the largest focus value (see Michielssen, E. and Weile, D.S., 1997; Johnson, J.M. and Rahmat Samii, Y., 1997). The focus value, which represents the amount of the high frequency output image components, can scale the resolution of the 3D scanning near-field image. Through detailed observation of the relationship between gradient estimator and the FIR high-pass filter, the basic structure for the frequency selective weighted median (FSWM) criterion function is derived. Since the FSWM filter not only extracts high frequency components (edges) from the images, but also eliminates impulsive noise, it can estimate the focus value more precisely (see Choi, K.S., 1999; Choi and Ko, S.J., 1999). View full abstract»

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    Development on a dual-frequency antenna at Ku & C bands

    Peng Jun ; Wang Guangming ; Ju Zhiqin
    Microwave Conference Proceedings, 2005. APMC 2005. Asia-Pacific Conference Proceedings

    Volume: 4
    DOI: 10.1109/APMC.2005.1606847
    Publication Year: 2005

    IEEE Conference Publications

    In this paper, a novel configuration of patch antenna is introduced, which provides a dual-band operation. This structure consists of a C-band cross patch with four square patches printed in the empty spaces among the arms of the cross. These patches provide a subarray working at Ku-band. This structure is simple to design and offers the advantage that it can be printed on a single-layer. View full abstract»

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    NUFFT-based algorithm for near-field MMW synthetic aperture imaging radiometers

    Mengjiao Yu ; Yuehua Li ; Jianfei Chen
    Mechatronic Sciences, Electric Engineering and Computer (MEC), Proceedings 2013 International Conference on

    DOI: 10.1109/MEC.2013.6885122
    Publication Year: 2013 , Page(s): 527 - 531

    IEEE Conference Publications

    The near-field MMW synthetic aperture imaging radiometer is very excellent imaging system for obtaining high resolution images. The corresponding imaging algorithms are usually established based on the conventional FFT with the uniform sampling of visibility function. But a lot of irregular antenna arrays appeared for some reason, such as the coordinate perturbation and the development of the synthetic aperture imaging system. And the visibility functions of these arrays are always random. The un-Cartesian sampling data are not distributed on the uniform grid points. For this random distribution of visibility function, the traditional FFT based on the uniform Cartesian sampling cannot image well. Thus we adopt NUFFT to reconstruct the images from the non-uniform visibility function samples in this paper. Based on the near-field imaging formulas, the accurate system functions are established in NUFFT algorithm. The effectiveness of the NUFFT is tested by the corresponding simulation experiments with 1D and 2D Target scenes. The results show that the NUFFT is an effective imaging algorithm for near-field MMW synthetic aperture imaging radiometer with arbitrary distribution of the visibility function. View full abstract»

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    SARSCAT-a ground based scatterometer for space-borne SAR applications

    Bo Sun ; Ji Wu
    Geoscience and Remote Sensing, 1997. IGARSS '97. Remote Sensing - A Scientific Vision for Sustainable Development., 1997 IEEE International

    Volume: 1
    DOI: 10.1109/IGARSS.1997.615788
    Publication Year: 1997 , Page(s): 24 - 26 vol.1

    IEEE Conference Publications

    SAR imaging applications are usually carried out by two ways: by physical/mathematics models and by the measured terrain material microwave signatures. In most of the cases, people like to use the mathematics models since the microwave signature databases do not match the practical case very well. In this paper, the authors discuss the reason for the uncertainties provided by these databases from the instrument point of view and propose a new ground-based scatterometer, SARSCAT, specially designed for SAR applications View full abstract»

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    Development of a Novel FDTD (2, 4)-Compatible Conformal Scheme for Electromagnetic Computations of Complex Curved PEC Objects

    Jian Wang ; Wen-Yan Yin
    Antennas and Propagation, IEEE Transactions on

    Volume: 61 , Issue: 1
    DOI: 10.1109/TAP.2012.2216851
    Publication Year: 2013 , Page(s): 299 - 309
    Cited by:  Papers (1)

    IEEE Journals & Magazines

    We present a modified fourth-order finite-difference time-domain [FDTD (2, 4)] conformal scheme for accurately computing electromagnetic characteristics of some complex three-dimensional (3D) perfectly conducting (PEC) objects. It has higher accuracy and efficiency than those of conventional FDTD and FDTD (2, 4) methods, as coarse meshes are employed with staircase errors reduced effectively during its implementation. Two integration loops of the Faraday's law are used for updating magnetic field components, while the updating equations of electric field ones are the same as those in the normal FDTD method. A rigorous analysis of its global stability, based on the conventional high-order FDTD stability criterion and the Fourier method, is also performed. In order to obtain stable and accurate numerical results, a user-defined geometric precision technique, which gives a criterion for determining the time step, is employed for our computations. It is numerically demonstrated that using our proposed FDTD (2, 4)-compatible conformal scheme, high accuracy and low dispersion errors can be achieved for fast predicting radar cross sections as well as induced current distribution of some complex 3-D structures. View full abstract»

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    Primary analysis of development approach to Chinese satellite mobile communication

    Kai, Tong ; Jianning, Guo
    Systems Engineering and Electronics, Journal of

    Volume: 4 , Issue: 3
    Publication Year: 1993 , Page(s): 15 - 27
    Cited by:  Papers (1)

    BIAI Journals & Magazines

    The paper describes the development of mobile communication first and then points out that it is necessary for China to develop satellite mobile communication after comparing the cellular mobile communication with the satellite mobile communication. After comparing the geostationary satellite system with the low earth orbit satellite mobile communication system, as well as the single beam with the multi-beams, both used in satellite mobile communication, we suggest that China, according to its economic status and level of satellite technology, should develop a geostationary multi-beams satellite for its domestic mobile communication. View full abstract»

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    A model of MIMO system over a three-dimensional rough surface

    Wei Li ; Ya-Qiu Jin
    Antennas Propagation and EM Theory (ISAPE), 2010 9th International Symposium on

    DOI: 10.1109/ISAPE.2010.5696567
    Publication Year: 2010 , Page(s): 714 - 717
    Cited by:  Papers (1)

    IEEE Conference Publications

    Multiple input-multiple output (MIMO) system is a promising technique for B3G/4G development. In this paper, the MIMO system above a 3-D randomly rough surface is modelled and numerically analyzed. The Monte Carlo method is employed to generate randomly rough surface, and the Kirchhoff approximation (KA) is applied to calculation of system scattering and the channel transfer matrix. It shows the dependence of the system capacity upon the array geometry and underlying surface parameters. It is found that the channel capacity significantly related with the inter-element separation of the antenna array. When the separation is small, the MIMO capacity due to presence of rough surface can be enhanced. However, when the separation is increased, the MIMO capacity becomes significantly reduced. View full abstract»

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