East China Research Institute of Electronic Engineering

East China, China

East China Research Institute of Electronic Engineering

East China, China
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Zhu Q.,East China Research Institute of Electronic Engineering | Lai Q.,East China Research Institute of Electronic Engineering
Proceedings of 2016 IEEE International Conference on Electronic Information and Communication Technology, ICEICT 2016 | Year: 2017

In order to optimize the radiation performance of conformal array, the CVCPSO is introduced in this paper. The amplitude of elements can be optimized by the CVCPSO when the arrangement form is settled. The CVCPSO is much easier to find the global optimal position while BPSO shows a weak ability to escape from regional optimal values. Results show that the array optimized by the CVCPSO presents lower PSLL and higher gain. © 2016 IEEE.


Gao C.,East China Research Institute of Electronic Engineering | Lai Q.,East China Research Institute of Electronic Engineering
Proceedings of 2016 IEEE International Conference on Electronic Information and Communication Technology, ICEICT 2016 | Year: 2017

A method to compute patterns of arbitrary planar antenna arrays based on DFT (Discrete Fourier Transform) is proposed. By complex Fourier series expansion, irregular arrays are approximated to regular arrays. And array patterns are obtained by applying DFT. Examples are provided to illustrate the proposed method. A comparison between the proposed method and the series summation method is performed. The coincident results in patterns show the preciseness of the proposed method, while the computing time ratios show the efficiency of the proposed method. © 2016 IEEE.


Wang J.,China Institute of Technology | Wang Y.,China Institute of Technology | Zhang J.,East China Research Institute of Electronic Engineering | Ge J.,East China Research Institute of Electronic Engineering
IEEE Geoscience and Remote Sensing Letters | Year: 2013

Bistatic synthetic aperture radar with geostationary illuminator (GeoBiSAR) has its own characteristics in terms of geometrical configuration. In this letter, we treat the Earth's surface as an ellipsoid surface and consider the case of large coherent integration angle and then combine them with the existing methods to determine three key elements describing 2-D resolution for GeoBiSAR and give the generalized resolution calculation formulas for GeoBiSAR. Simulation results verify the validity of the resolution calculation formulas and the related conclusions. © 2012 IEEE.


Cui Y.,Beijing University of Posts and Telecommunications | Dai Y.,Beijing University of Posts and Telecommunications | Yin F.,Beijing University of Posts and Telecommunications | Dai J.,East China Research Institute of Electronic Engineering | And 3 more authors.
Optics Express | Year: 2013

An intermodulation distortion suppression method based on the optical carrier band processing is demonstrated. A systematic analysis of the main optical spectrum contributors for the third-order intermodulation distortion in the nonlinear system is presented. Theoretical analysis shows that the third-order intermodulation distortion terms can cancel each other if a proper phase shifting is imposed to the optical carrier band. We experimentally demonstrate the approach with a two-tone test and a suppression of about 33 dB in the third-order intermodulation distortion is obtained. Experimental results show that an overall fundamental to thirdorder intermodulation distortion ratio of up to 64 dB is achieved and the link dynamic range is improved by 14.7 dB, compared with the conventional link without the proposed optical carrier band processing. ©2013 Optical Society of America.


Zhong X.,CAS Institute of Electronics | Zhong X.,East China Research Institute of Electronic Engineering | Xiang M.,CAS Institute of Electronics | Yue H.,CAS Institute of Electronics | Guo H.,CAS Institute of Remote Sensing
IEEE Transactions on Geoscience and Remote Sensing | Year: 2014

Due to the lack of accuracy in the navigation system, deviations in the order of centimeters between the real trajectory and the measured one, called residual motion errors (RMEs), frequently appear in synthetic aperture radar (SAR) images. They usually cause azimuth defocusing and phase errors. For very high-resolution SAR imaging and repeat-pass SAR interferometry, the RME must be estimated and compensated. In the literature, the algorithms used to estimate such errors are mainly through interferometry. The error difference for the SAR image pair is calculated, and then the correction is applied either on one image, or alternatively fractions of it on both images. However, the accuracy of this approach is greatly deteriorated by the decorrelation and ground movements. In this paper, we associate the phase difference between two adjacent subaperture images with the second derivative of the RME, and propose a new algorithm to estimate the RME for individual SAR image. It exploits point-like targets distributed along the azimuth direction, and not only corrects the phase error, but also improves the azimuth focusing. Therefore, besides in airborne repeat-pass interferometry, the algorithm can also be applied in very high-resolution SAR imaging. Simulated and real SAR data are used to demonstrate its feasibility and accuracy. Its limitations and extensions are also discussed at the end of the paper. © 1980-2012 IEEE.


Xu F.,East China Research Institute of Electronic Engineering
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2015

Designed a multi-channel photonic mixing system based on cascade carrier suppression, which can achieve frequency conversions simultaneously for multi-channels, effectively inhibit the generation of third-order intermodulation, and significantly reduce the insertion loss in the conversion process. Meanwhile, a simulation with the software Optisystem has been done, indicating excellent frequency-conversion characteristics and good scalability of this scheme, that shows the microwave photonic frequency conversion can be a potential application for microwave signal parallel processing. © 2015 SPIE.


Xue W.,East China Research Institute of Electronic Engineering
Proceedings of 2011 IEEE CIE International Conference on Radar, RADAR 2011 | Year: 2011

The paper detailedly introduced the mechanical, thermal and electromagnetic properties of Aramid fiber composites. The applications of Aramid fiber composites in radar components home and abroad were analysed. According to research and design requirements, resin transfered molding (RTM) technique was selected. Exploratory research was described from selection and technological test of resin system, establishment and control of technological parameters in molding process. Also the quality and performance of the products were detected, tested and appraised. The result shows that the quality and performance of final products are excellent and can meet the design and application requirements. © 2011 IEEE.


Chen Z.,East China Research Institute of Electronic Engineering
Proceedings of 2011 IEEE CIE International Conference on Radar, RADAR 2011 | Year: 2011

The development of phased array radar puts ever-increasing demand on its beam steering system. Especially, for a large-scaled two-dimensional phase controlled radar, its beam steering system should provide a rapid and flexible beam steering control in order to realize a real-time control of the radar in target search and tracking. The paper presents a beam steering system with scalable basic modules made up of an integrated transceiver and receiver (T/R) modules and embedded controllers. By use of this beam steering system, a real-time beam steering control for all the elements in the antenna array can be realized. © 2011 IEEE.


Wu M.,East China Research Institute of Electronic Engineering
Proceedings of 2011 IEEE CIE International Conference on Radar, RADAR 2011 | Year: 2011

This paper presents the architecture of digital array radar and analysis the key technologies, digital T/R modules, waveform generation and amplitude-phase control module based on DDS, frequency up/down convert, high efficiency power amplifier, hybrid digital/microwave multilayer circuit and high performance computing are described as the main technologies. The correlation between the microsystems technologies and digital array architectures trends is also discussed. © 2011 IEEE.


Wu X.-H.,South China University of Technology | Wu X.-H.,East China Research Institute of Electronic Engineering | Chu Q.-X.,South China University of Technology | Qiu L.-L.,South China University of Technology
IEEE Microwave and Wireless Components Letters | Year: 2013

A circuit for differential wideband bandpass filter (BPF) is presented. The circuit works as a bandpass and bandstop filter under differential- and common-mode excitation, respectively. Under differential-mode, two transmission zeros are generated by the short-ended parallel-coupled stubs and supply a very sharp differential passband. The circuit parameters are analyzed and given to show the circuit characteristics. Finally, the circuit is implemented using microstrip technology and a differential wideband BPF is designed, simulated and measured. Simulated and measured results are well agreed. © 2013 IEEE.

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