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Liu Y.,National University of Defense Technology | Wei X.,National University of Defense Technology | Peng B.,National University of Defense Technology | Ling Y.,Electronic Engineering Institute of PLA
Journal of Systems Engineering and Electronics | Year: 2017

Scatterers often exhibit aspect or frequency dependence which affects the micro-Doppler shift in scattering response. For cone-cylinder targets, sliding-type scatterers which slide on the edge discontinuity with the change of the incident angle are the most dominant nonideal scattering models. A method is proposed to discriminate among the scatterers on the cone-cylinder target based on the deviation degree of micro-Doppler from sinusoid. By extracting the amplitude and initial phase, the micro-Doppler is estimated as sinusoid. Then the deviation degree is evaluated by the error between the extracted sinusoidal micro-Doppler and the actual micro-Doppler curve. Threshold for the classification is determined with the simulation data. After classification, the micro-Doppler features of sliding-type scatterers are exploited to estimate the target dimensions. The influence of parameters errors and noise on estimation of target dimensions is also illustrated with the simulation data. © 1990-2011 Beijing Institute of Aerospace Information.

Wang J.,Hefei University of Technology | Wang S.,Electronic Engineering Institute of PLA
Lecture Notes in Electrical Engineering | Year: 2013

This paper extends the existing models to the case where the random demand depending on advertising expenditure and selling price follows the additive form. The retailer's optimal ordering, pricing and advertising decision model and the manufacturer's optimal production decision model are respectively developed, and the closed-form solution to each model is provided as well. Moreover, we explore the effect of different forms of demand function (i.e., multiplicative form and additive form) on the decisions of the supply chain members. Our analysis suggests that the multiplicative form fits for depicting the demand of the branded products while the additive form is appropriate for the new or low brand recognition products. Finally, we implement a numerical study to illustrate the models. © 2013 Springer-Verlag.

Wang J.,Hefei University of Technology | Wang S.,Electronic Engineering Institute of PLA | Min J.,Anhui University
International Journal of Systems Science | Year: 2015

In this paper, we study the optimal two-stage advertising and ordering policies and the channel coordination issues in a supply chain composed of one manufacturer and one retailer. The manufacturer sells a short-life-cycle product through the retailer facing stochastic demand in dynamic markets characterised by price declines and product obsolescence. Following a two-period newsvendor framework, we develop two members optimal ordering and advertising models under both the centralised and decentralised settings, and present the closed-form solutions to the developed models as well. Moreover, we design a two-period revenue-sharing contract, and develop sufficient conditions such that the channel coordination can be achieved and a win-win outcome can be guaranteed. Our analysis suggests that the centralised decision creates an incentive for the retailer to increase the advertising investments in two periods and put the purchase forward, but the decentralised decision mechanism forces the retailer to decrease the advertising investments in two periods and postpone/reduce its purchase in the first period. This phenomenon becomes more evident when demand variability is high. © 2013 Taylor and Francis.

Wang S.-D.,Electronic Engineering Institute of PLA | Wang J.-P.,Hefei University of Technology | Zhou Y.-W.,South China University of Technology
Kongzhi yu Juece/Control and Decision | Year: 2013

This paper develops a two-period order decision model for the dynamic perishable product. The theoretical analysis of the optimal solutions to the considered problem is presented, and a simple method for finding the optimal two-period order policy is given as well. A practical purchasing example of Netac USB flash driver is presented to illustrate the application of the model. Finally, according to the investigation of the relationships between the order decision and such factors as the demand fluctuation, the correlation coefficient of two-period demands, and backlogging rate, some important managerial insights are obtained.

Min J.,Anhui University of Architecture | Zhou Y.-W.,South China University of Technology | Liu G.-Q.,Hefei University of Technology | Wang S.-D.,Electronic Engineering Institute of PLA
International Journal of Systems Science | Year: 2012

This article develops an inventory model for exponentially deteriorating items under conditions of permissible delay in payments. Unlike the existing related models, we assume that the items are replenished at a finite rate and the demand rate of the items is dependent on the current inventory level. The objective is to determine the optimal replenishment policies in order to maximise the system's average profit per unit of time. A simple method is shown for finding the optimal solution of the model based on the derived properties of the objective function. In addition, we deduce some previously published results as the special cases of the model. Finally, numerical examples are used to illustrate the proposed model. Some managerial insights are also inferred from the sensitive analysis of model parameters. © 2012 Taylor and Francis Group, LLC.

Wu Y.-J.,State Key Laboratory of Pulsed Power Laser Technology | Wu Y.-J.,Electronic Engineering Institute of PLA | Huang Y.,Electronic Engineering Institute of PLA | Wu X.-L.,Anhui University
Dianbo Kexue Xuebao/Chinese Journal of Radio Science | Year: 2011

A general geometry model of airborne bistatic spotlight SAR is firstly established, and the echo expression in time-frequency domain is presented. Secondly, the difference frequency processing is performed by using the echo of the imaging scene center as the reference. The difference distance obtained is expanded into Taylor series. Then, the three-dimensional spatial resolution of bistatic spotlight SAR is formulated by using the first-order approximation under far-field assumption. Theoretical results are illustrated by numerical simulations. Finally, based on a general bistatic configuration with the transmitter and the receiver flying along the horizontal direction and the sloping direction, the paper analyzes the variation rules of the spatial resolution following by the geometric configuration and the motion parameters. Copyright © 2011 by Editorial Department of Chinese Journal of Radio Science.

Liu J.-C.,Electronic Engineering Institute of PLA | Yang X.-J.,Electronic Engineering Institute of PLA
Dianzi Yu Xinxi Xuebao/Journal of Electronics and Information Technology | Year: 2012

In view of the fast development of information countermeasure and intelligent communication, recognition of channel coding has been a vital issue in information interception. This paper proposes a new method of recognition in order to recognize the (n,1,m) convolutional codes. Firstly, this method defines the notion of check-sequence, and solves it by an advanced model of matrix, then deduces the matrix of generator polynomial, having recognized the convolutional code, by check-sequence. Finally, examples of simulation show that this method is able to recognize, neither knowing the parameter of code n nor the begin location of coding, all (n,1,m) convolutional codes effectively.

Zhang Y.,Electronic Engineering Institute of PLA | Yang X.-J.,Electronic Engineering Institute of PLA
Binggong Xuebao/Acta Armamentarii | Year: 2013

A method is proposed to recognize the frame synchronization codes of the sequence intercepted by non-cooperative part. This method is to use a small area detection algorithm to estimate the frame length, then use the secondary filter to judge the start bit of frame, and finally use the fuzzy matching algorithm to recognize the frame synchronization code. The simulation result shows that, if the bit error rate (BER) is less than 4%, the proposed method can achieve a high recognition probability for the frame synchronization code of synchronized data frames, where the recognition probabilities for the Barker codes and m-sequences are 80% and 78%, respectively.

Fan F.-H.,Electronic Engineering Institute of PLA | Ruan H.-L.,Electronic Engineering Institute of PLA
Tien Tzu Hsueh Pao/Acta Electronica Sinica | Year: 2014

There could be large error in Compressive Sensing Ultra-Wide Band (CS-UWB) channel estimation because of the coherence of sensing information matrix and the noise interference. Firstly, the Adaptive Sensing Information (ASI) matrix is constructed by measurement vector weighting, which has the desirable properties of low coherence and containing measurement information to support the sparse recovery algorithms to obtain optimal atoms. Secondly, a modified Sparsity Adaptive Matching Pursuit (SAMP) algorithm is proposed to recovery sparse signal accurately without prior information of sparsity or SNR. Finally, a non-convex CS-UWB channel estimation method is presented based on the ASI matrix and the modified SAMP algorithm. Both the theoretical analysis and the experimental results show that this method can accurately reconstruct UWB communication channel in low SNR conditions with very low compressive sampling ratio.

Yang X.-J.,Electronic Engineering Institute of PLA | Liu J.-C.,Electronic Engineering Institute of PLA | Zhang Y.,Electronic Engineering Institute of PLA
Yuhang Xuebao/Journal of Astronautics | Year: 2013

A novel method of recognition is proposed to recognize the (n, k, m) convolutional codes applied in satellite communication, deep space exploration and so on. The linear constraint relation between convolutional codes is used to improve constructing the model of analysis matrix, thus reducing the data needed in recognition effectively. On the foundation of having recognized length of code, first location of codes and the check-sequence by simplifying the matrix, a method is proposed to deduce the matrix of polynomials generated by the check-sequence, and to recognize the convolutional code at last. The examples of simulation show that the method of recognition is able to recognize all (n, k, m) convolutional codes effectively without any known conditions.

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