Jiangsu Key Laboratory of Meteorological Observation and Information Processing

Nanjing, China

Jiangsu Key Laboratory of Meteorological Observation and Information Processing

Nanjing, China

Time filter

Source Type

Yang J.,Key Laboratory for Aerosol Cloud Precipitation of China Meteorological Administration | Liu Q.,Jiangsu Key Laboratory of Meteorological Observation and Information Processing | Liu Q.,Jiangsu Collaborative Innovation Center on Atmospheric Environment and Equipment Technology | Dai W.,Key Laboratory for Aerosol Cloud Precipitation of China Meteorological Administration | Ding R.,Jiangsu Meteorological Observation Center
Journal of Atmospheric and Solar-Terrestrial Physics | Year: 2016

Due to solar radiation exposure, air flowing inside a naturally ventilated radiation shield may produce a measurement error of 0.8 °C or higher. To improve the air temperature observation accuracy, a temperature error correction method is proposed. The correction method is based on a Computational Fluid Dynamics (CFD) method and a Genetic Algorithm (GA) method. The CFD method is implemented to analyze and calculate the temperature errors of a naturally ventilated radiation shield under various environmental conditions. Then, a temperature error correction equation is obtained by fitting the CFD results using the GA method. To verify the performance of the correction equation, the naturally ventilated radiation shield and an aspirated temperature measurement platform are characterized in the same environment to conduct the intercomparison. The aspirated temperature measurement platform serves as an air temperature reference. The mean temperature error given by measurements is 0.36 °C, and the mean temperature error given by correction equation is 0.34 °C. This correction equation allows the temperature error to be reduced by approximately 95%. The mean absolute error (MAE) and the root mean square error (RMSE) between the temperature errors given by the correction equation and the temperature errors given by the measurements are 0.07 °C and 0.08 °C, respectively. © 2016 Elsevier Ltd


Jia-qiang L.,Nanjing University of Information Science and Technology | Rong-hua Z.,Nanjing University of Information Science and Technology | Jin-li C.,Nanjing University of Information Science and Technology | Jin-li C.,Jiangsu Key Laboratory of Meteorological Observation and Information Processing | And 2 more authors.
IET Science, Measurement and Technology | Year: 2016

The primary problem of tracking filtering algorithms is the tracking stability and effectiveness of target states. Based on the particle filter, an adaptive strong tracking particle filter algorithm is proposed in this study. According to the residual between actual measurement values and predicted measurement values of every moment, adjustment of the forgetting factor and the weakening factor is adaptively conducted. Then, by calculating the fading factor, transfer covariance matrix and filter gain of the system are obtained to estimate the particles state value. Updating the importance density function can alleviate the degradation phenomenon of particle filter, and it contributes to effective estimation for the optimal state value of a target. The simulation results demonstrate that the proposed algorithm provides a better tracking precision. In addition, when the target states make mutations, the proposed algorithm can track the mutation states of moving targets effectively and improve the stability of the system. © The Institution of Engineering and Technology 2016.


Sun X.-Y.,Nanjing University of Information Science and Technology | Sun X.-Y.,Jiangsu Key Laboratory of Meteorological Observation and Information Processing | Sun X.-Y.,Nanjing University of Aeronautics and Astronautics | Zhou J.-J.,Nanjing University of Aeronautics and Astronautics | Chen H.-W.,Nanjing University of Aeronautics and Astronautics
Multidimensional Systems and Signal Processing | Year: 2016

Conventional direction-of-arrival (DOA) estimation methods for coherent noncircular signals may reduce the effective aperture of sensor arrays and thus have low estimation accuracy. To address this problem, a low complexity algorithm for DOA estimation of noncircular coherent signals, the extended ESPRIT-like (EEL) algorithm, is proposed in this paper. The proposed EEL algorithm has fully utilized the effective array aperture and the number of the sources that can be detected by the proposed algorithm now can attain the two-third of the total number of the impinging sources. Compared with the existing DOA estimation methods for noncircular coherent signals, the proposed EEL algorithm has lower computational complexity and higher DOA estimation accuracy. Simulation results are presented to show the superior performance of the proposed method. © 2014, Springer Science+Business Media New York.


Lu F.,Nanjing University of Information Science and Technology | Chen X.,Nanjing University of Information Science and Technology | Chen X.,Jiangsu Key Laboratory of Meteorological Observation and Information Processing
Advances in Intelligent and Soft Computing | Year: 2012

Scene change occurs frequently in the video, which has an important impact on the video quality. The JVT-G012 rate control algorithm for H.264/AVC uses fixed-length group of picture structure, which can not effectively deal with the video sequence scene change, resulting in the quality decline of frames after scene change. We reviewed the scene change-based H.264 rate control methods in this paper. They are classified into two categories-scene change detection-based rate control method and scene adaptive rate control method. A comparative study of the interaction and discussion about the various algorithms and their advantages and disadvantages are presented. Based on these research results, some improvedment are discussed. © 2012 Springer-Verlag GmbH.


Wang H.-B.,Nanjing University of Information Science and Technology | Zhou X.-Y.,Jiangsu Key Laboratory of Meteorological Observation and Information Processing | Zhou X.-Y.,Nanjing University of Information Science and Technology | An X.-X.,Nanjing University of Information Science and Technology | And 2 more authors.
International Journal of Theoretical Physics | Year: 2016

A scheme for the deterministic joint remote preparation of a four-qubit cluster-type state using only two Greenberger-Horne-Zeilinger (GHZ) states as quantum channels is presented. In this scheme, the first sender performs a two-qubit projective measurement according to the real coefficient of the desired state. Then, the other sender utilizes the measurement result and the complex coefficient to perform another projective measurement. To obtain the desired state, the receiver applies appropriate unitary operations to his/her own two qubits and two CNOT operations to the two ancillary ones. Most interestingly, our scheme can achieve unit success probability, i.e., Psuc=1. Furthermore, comparison reveals that the efficiency is higher than that of most other analogous schemes. © 2016 Springer Science+Business Media New York


Chen X.,Nanjing University of Information Science and Technology | Chen X.,Jiangsu Key Laboratory of Meteorological Observation and Information Processing | Xu K.,Nanjing University of Information Science and Technology
Applied Mechanics and Materials | Year: 2012

Ultrasonic wave transmitted in the plate is called Lamb wave. The dispersion characteristic of Lamb wave makes it very complicated to be used in material Nondestructive Testing (NDT). In order to solve this problem, the analysis of frequency-dispersion characteristic of Lamb wave is made in this paper, and the dispersion curves of the Lamb wave in specific plate are plotted, then the physical propagation model of Lamb wave is established. Under the analysis of FFT, the expressions of the Lamb wave in specific plate are obtained. By combining with the dispersion characteristic of the Lamb wave, the changes of waveform in different propagation distances are simulated. With the deep researches of new algorithms, Lamb wave will be applied in wider area. © (2012) Trans Tech Publications, Switzerland.


Chen X.,Nanjing University of Information Science and Technology | Chen X.,Jiangsu Key Laboratory of Meteorological Observation and Information Processing
Advances in Intelligent and Soft Computing | Year: 2012

China universities and colleges characteristic specialty construction is an important method to optimize the professional structure, improve the quality of personnel training, and professional characteristics. Based on construction of national characteristic specialty in Electronic and Information Engineering of Nanjing University of Information Science and Technology, this paper introduced its specialty training objectives and positioning, and proposed building program. We proposed specific reforms and innovative measures from eight aspects, i.e., the conciseness of the professional characteristics, teachers team construction pattern, personnel training model, deepening of curriculum development, enrich the content of practice teaching, improvement of the scientific research, consummating of teaching management system, and internationalization education. This is suited to the requirements of the new century training model, forming significant professional characteristics. © 2012 Springer-Verlag GmbH.


Heng L.,Nanjing University of Information Science and Technology | Heng L.,JiangSu Key Laboratory of Meteorological Observation and Information Processing | Li M.R.,Nanjing University of Information Science and Technology
International Journal of Adaptive Control and Signal Processing | Year: 2013

This paper provides detailed information about the dynamic model and closed-loop control theory of resonant accelerometer based on electrostatic stiffness. After the resonant accelerometer principle based on electrostatic stiffness has been analyzed, a dynamic model was built. According to the requirement of constant stable vibration amplitude for a different applied acceleration, control equations based on self-sustained oscillation loop technology were also developed for the whole system. By applying the averaging method, the system behaviors were analyzed, and equilibria for the vibration amplitude were achieved. Theoretical analysis and simulation showed that the vibration amplitude became stable and attractive only when the stable criterion was satisfied. Using a PI controller, constant level vibrating amplitude can be achieved when the input acceleration changes. A resonant accelerometer was fabricated using bulk-silicon dissolved process. Under the aforementioned conditions, the accelerometer was driven and tested using a self-sustained oscillation loop. When the sensing voltage was 5 V, the sensitivity was 58 Hz/g, and the resolution was 3.5 mg for a single vibrating beam. Copyright © 2012 John Wiley & Sons, Ltd. Copyright © 2012 John Wiley & Sons, Ltd.


Jie Z.,Jiangsu Key Laboratory of Meteorological Observation and Information Processing | Jie Z.,Toyohashi University of Technology | Zhigang C.,Jiangsu Key Laboratory of Meteorological Observation and Information Processing | Kikuchi H.,Toyohashi University of Technology
Journal of China Universities of Posts and Telecommunications | Year: 2015

A three-dimensional (3D) Von Mises Fisher (VMF) distribution model was derived in multiple-input and multiple-output (MIMO) antenna communication environment. The azimuth of arrival and elevation of arrival are distributed for VMF distribution instead of the uniform or other traditional distributions. In particular the MIMO uniform Y-shaped array (UYA) and the uniform circular array (UCA) antenna topology are considered at mobile station and base station. The developed spatial fading correlation of the VMF model is determined by parameters of the concentration parameter, antenna spacing, mean azimuth of arrival, mean elevation of arrival. Using the channel model, the effects of the concentration parameter and the mean elevation angle on the capacity of MIMO antenna systems was analyzed. It is shown that the mean elevation of arrival must be taken into account in 3D MIMO communication environment. © 2015 The Journal of China Universities of Posts and Telecommunications.


Wang Y.,Nanjing University of Aeronautics and Astronautics | Wang Y.,Jiangsu Key Laboratory of Meteorological Observation and Information Processing | Cao Q.,Nanjing University of Aeronautics and Astronautics | Cao Q.,Jiangsu Key Laboratory of Meteorological Observation and Information Processing
IET Microwaves, Antennas and Propagation | Year: 2015

Electromagnetic (EM) surface responses in the extremely low-frequency (ELF) band caused by possible underground resources are studied. Unlike traditional solutions, the authors apply the geodesic finite-difference time domain method to simulate ELF EM wave propagation in the whole Earth (including the crust)-ionosphere (E-I) system to study these responses. In this way, more rigorous analysis can be achieved by simulating the complex E-I environments, including the inhomogeneous crust and part of the ionosphere. Based on this method, they established a hypothetical model to study the effects of underground objects on received artificial signals. Through simulations, local surface responses and response perturbations caused by underground objects are studied and approximate formulas are obtained for predicting the behaviour of these responses. Finally, potential applications of the method and the results of this work are discussed. © The Institution of Engineering and Technology 2015.

Loading Jiangsu Key Laboratory of Meteorological Observation and Information Processing collaborators
Loading Jiangsu Key Laboratory of Meteorological Observation and Information Processing collaborators