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| 1 | Polyphase orthogonal sequences design for opportunistic array radar via HGA显示文摘Opportunistic array radar(OAR) is a new generation radar system based on the stealth of the platform,which can improve the modern radar performance effectively.Designing the orthogonal code sets with low autocorrelation and cross-correlation is a key issue for OAR.This paper proposes a novel hybrid genetic algorithm(HGA) and designs the polyphase orthogonal code sets with low autocorrelation and cross-correlation properties,which can be used in the OAR system.The novel algorithm combines with simulated annealing(SA) and genetic algorithm(GA),adds in keeping best individuals and competition in small scope,and introduces grey correlation evaluation to evaluate fitness function. These avoid the premature convergence problem existed in GA and enhance the global searching capability.At last,the genetic results are optimized to obtain the best solution by using greedy algorithm.The simulation results show that the proposed algorithm is effective for the design of orthogonal phase signals used in OAR systems. | Shufeng Gong Weijun Long Hao Huang De Ben Minghai Pan | 2013 | Journal of Systems Engineering and Electronics2013，24，1： | 9 |
| 2 | Hardware-in-the-loop simulation technology of wide-band radar targets based on scattering center model显示文摘Hardware-in-the-loop(HWIL) simulation technology can verify and evaluate the radar by simulating the radio frequency environment in an anechoic chamber. The HWIL simulation technology of wide-band radar targets can accurately generate wide-band radar target echo which stands for the radar target scattering characteristics and pulse modulation of radar transmitting signal. This paper analyzes the wide-band radar target scattering properties first. Since the responses of target are composed of many separate scattering centers, the target scattering characteristic is restructured by scattering centers model. Based on the scattering centers model of wide-band radar target, the wide-band radar target echo modeling and the simulation method are discussed. The wide-band radar target echo is reconstructed in real-time by convoluting the transmitting signal to the target scattering parameters. Using the digital radio frequency memory(DRFM) system,the HWIL simulation of wide-band radar target echo with high accuracy can be actualized. A typical wide-band radar target simulation is taken to demonstrate the preferable simulation effect of the reconstruction method of wide-band radar target echo. Finally, the radar target time-domain echo and high-resolution range profile(HRRP) are given. The results show that the HWIL simulation gives a high-resolution range distribution of wide-band radar target scattering centers. | Huang Hao Pan Minghai Lu Zhijun | 2015 | Chinese Journal of Aeronautics2015，28，5： | 8 |
| 3 | Impacts of space-time-frequency synchronization errors onwide-band target echo characteristics of bistatic/multistatic radar显示文摘Bistatic/multistatic radar has great potential advantages over its monostatic counterpart. However, the separation of a transmitter and a receiver leads to difficulties in locating the target position accurately and guaranteeing space-timefrequency synchronization of the transmitter and the receiver.The error model of space-time-frequency synchronization in a motion platform of bistatic/multistatic radar is studied. The relationship between the space synchronization error and the transmitter platform position, receiver platform position, moving state, and beam pointing error, is analyzed. The effect of space synchronization error on target echo power is studied. The target scattering characteristics are restructured by many separate scattering centers of the target in high frequency regions. Based on the scattering centers model of the radar target, this radar target echo model and the simulation method are discussed. The algorithm of bistatic/multistatic radar target echo accurately reflects the scattering characteristics of the radar target, pulse modulation speciality of radar transmitting signals, and spacetime-frequency synchronization error characteristics between the transmitter station and the receiver station. The simulation of bistatic radar is completed in computer, and the results of the simulation validate the feasibility of the method. | Minghai Pan Qinghua Han Shufeng Gong Weijun Long Haitao Wei | 2016 | Journal of Systems Engineering and Electronics2016，27，3： | 2 |
| 4 | Time resource management of OAR based on fuzzy logic priority for multiple target tracking显示文摘For coping with the multiple target tracking in the presence of complex time-varying environments and unknown target information, a time resource management scheme based on chance-constraint programming(CCP) employing fuzzy logic priority is proposed for opportunistic array radar(OAR). In this scheme,the total beam illuminating time is minimized by effective time resource allocation so that the desired tracking performance is achieved. Meanwhile, owing to the randomness of radar cross section(RCS), the CCP is used to balance tracking accuracy and time resource conditioned on the specified confidence level. The adaptive fuzzy logic prioritization, imitating the human decision-making process for ranking radar targets, can realize the full potential of radar. The Bayesian Crame ′r-Rao lower bound(BCRLB) provides us with a low bound of localization estimation root-mean-square error(RMSE), and equally important, it can be calculated predictively. Consequently, it is employed as an optimization criterion for the time resource allocation scheme. The stochastic simulation is integrated into the genetic algorithm(GA) to compose a hybrid intelligent optimization algorithm to solve the CCP optimization problem. The simulation results show that the time resource is saved strikingly and the radar performance is also improved. | HAN Qinghua PAN Minghai ZHANG Wucai LIANG Zhiheng | 2018 | Journal of Systems Engineering and Electronics2018，29，4： | 2 |
| 5 | HDAC I/IIb selective inhibitor Purinostat Mesylate combined with GLS1 inhibition effectively eliminates CML stem cells显示文摘Purinostat Mesylate(PM)is a novel highly selective and active HDAC I/IIb inhibitor,and the injectable formulation of PM(PMF)based on the compound prescription containing cyclodextrin completely can overcome PM’s poor solubility and improves its stability and pharmacokinetic properties.Here,we showed that PM effectively repressed the survival of Ph+leukemia cells and CD34+leukemia cells from CML patients in vitro.In vivo studies demonstrated that PMF significantly prevented BCR-ABL(T315I)induced CML progression by restraining leukemia stem cells(LSCs),which are insensitive to chemotherapy and responsible for CML relapse.Mechanism studies revealed that targeting HDAC I/IIb repressed several important factors for LSCs survival including c-Myc,β-Catenin,E2f,Ezh2,Alox5,and mTOR,as well as interrupted some critical biologic processes.Additionally,PMF increased glutamate metabolism in LSCs by increasing GLS1.The combination of PMF and glutaminase inhibitor BPTES synergistically eradicated LSCs by altering multiple key proteins and signaling pathways which are critical for LSC survival and self-renewal.Overall,our findings represent a new therapeutic strategy for eliminating LSCs by targeting HDAC I/IIb and glutaminolysis,which potentially provides a guidance for PMF clinical trials in the future for TKI resistance CML patients. | Qiang Qiu Linyu yang Yunyu Feng Zejiang Zhu Ning Li Li Zheng Yuanyuan Sun Cong Pan Huandi Qiu Xue Cui Wei He Fang Wang Yuyao Yi Minghai Tang Zhuang Yang Yunfan Yang Zhihui Li Lijuan Chen Yiguo Hu | 2023 | Bioactive Materials2023，，3： | 1 |
| 6 | Joint waveform selection and power allocation algorithm in manned/unmanned aerial vehicle hybrid swarm based on chance-constraint programming显示文摘In this paper, we propose a joint waveform selection and power allocation(JWSPA) strategy based on chance-constraint programming(CCP) for manned/unmanned aerial vehicle hybrid swarm(M/UAVHS) tracking a single target. Accordingly,the low probability of intercept(LPI) performance of system can be improved by collaboratively optimizing transmit power and waveform. For target radar cross section(RCS) prediction, we design a random RCS prediction model based on electromagnetic simulation(ES) of target. For waveform selection, we build a waveform library to adaptively manage the frequency modulation slope and pulse width of radar waveform. For power allocation,the CCP is employed to balance tracking accuracy and power resource. The Bayesian Cramér-Rao lower bound(BCRLB) is adopted as a criterion to measure target tracking accuracy. The hybrid intelli gent algorithms, in which the stochastic simulation is integrated into the genetic algorithm(GA), are used to solve the stochastic optimization problem. Simulation results demonstrate that the proposed JWSPA strategy can save more transmit power than the traditional fixed waveform scheme under the same target tracking accuracy. | ZHANG Yuanshi PAN Minghai LONG Weijun LI Hua HAN Qinghua | 2022 | Journal of Systems Engineering and Electronics2022，33，3： | 0 |
| 7 | An improved multiplicative exponent weighting vertical handoff algorithm for WLAN/WCDMA heterogeneous wireless networks显示文摘An improved MEW(multiplicative exponent weighting)algorithm,SLE-MEW is proposed for vertical handoff decision in heterogeneous wireless networks.It introduces the SINR(signal to interference plus noise ratio)effects,LS(least square)and information entropy method into the algorithm.An attribute matrix is constructed considering the SINR in the source network and the equivalent SINR in the target network,the required bandwidth,the traffic cost and the available bandwidth of participating access networks.Handoff decision meeting multi-attribute QoS(quality of service)requirement is made according to the traffic features.The subjective weight relation of decision elements is determined with LS method.The information entropy method is employed to derive the objective weights of the evaluation criteria,and lead to the comprehensive weight.Finally decision is made using MEW algorithm based on the attribute matrix and weight vector.Four 3GPP(the 3rd generation partnership project)defined traffic classes are considered in performance evaluation.The simulation results have shown that the proposed algorithm can provide satisfactory performance fitting to the characteristics of the traffic. | Liu Shengmei Pan Su Mi Zhengkun Meng Qingmin Xu Minghai | 2012 | Engineering Sciences2012，10，1： | 0 |
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