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| 1 | Improved differential geometric guidance commands for endoatmospheric interception of high-speed targets显示文摘Pure proportional navigation(PPN) is suitable for endoatmospheric interceptions,for its commanded acceleration is perpendicular to interceptor velocity.However,if the target is much faster than the interceptor,the homing performance of PPN will be degraded badly.True proportional navigation(TPN) does not have this problem,but its commanded acceleration is perpendicular to the line of sight(LOS),which is not suitable for endoatmospheric interceptions.The commanded acceleration of differential geometric guidance commands(DGGC) is perpendicular to the interceptor velocity,while the homing performance approximates the LOS referenced guidance laws(PPN series).Therefore,DGGC is suitable for endoatmospheric interception of high-speed targets.However,target maneuver information is essential for the construction of DGGC,and the guidance commands are complex and may be without robustness.Through the deep analysis of three-dimensional engagement,a new construction method of DGGC is proposed in this paper.The target maneuver information is not needed any more,and the robustness of DGGC is guaranteed,which makes the application of DGGC possible. | LI KeBo CHEN Lei TANG GuoJin | 2013 | Science China(Technological Sciences)2013，56，2： | 22 |
| 2 | Ideal proportional navigation for exoatmospheric interception显示文摘Ideal proportional navigation (IPN) is a natural choice for exoatmospheric interception for its mighty capture capability and ease of implementation. The closed-form solution of two- dimensional ideal proportional navigation was conducted in previous public literature, whereas the practical interception happens in the three-dimensional space. A novel set of relative dynamic equations is adopted in this paper, which is with the advantage of decoupling relative motion in the instantaneous rotation plane of the line of sight from the rotation of this plane. The dimension-reduced IPN is constructed in this instantaneous plane, which functions as a three-dimensional guidance law. The trajectory features of dimension-reduced IPN are explored, and the capture regions of dimension-reduced IPN with limited acceleration against nonmaneuvering and maneuvering targets are analyzed by using phase plane method. It is proved that the capture capability of IPN is much stronger than true proportional navigation (TPN), no matter the target maneuvers or not. Finally, simulation results indicate that IPN is more effective than TPN in exoatmospheric interception scenarios. | Li Kebo Zhang Taotao Chen Lei | 2013 | Chinese Journal of Aeronautics2013，26，4： | 16 |
| 3 | Algebraic solution of differential geometric guidance command and time delay control显示文摘According to the three-dimensional geometry of the engagement,the explicit algebraic expression of differential geometric guidance command(DGGC)is proposed.Compared with the existing solutions,the algebraic solution is much simpler and better for the further research of the characteristics of DGGC.Time delay control(TDC)is a useful method to tackle the uncertainty problem of a control system.Based on TDC,taking the target maneuvering acceleration as a disturbance,the estimation algorithm of the target maneuvering acceleration is presented,which can be introduced in DGGC to improve its performance.Then,the augmented DGGC(ADGGC)is obtained.The numerical simulation of intercepting a high maneuvering target is conducted to demonstrate the effectiveness of ADGGC. | LI KeBo CHEN Lei TANG GuoJin | 2015 | Science China(Technological Sciences)2015，58，3： | 13 |
| 4 | Performance of 3D TPN against true-arbitrarily maneuvering target for exoatmospheric interception显示文摘True proportional navigation(TPN) guidance law is widely used for exoatmospheric interception, for its robustness and ease of implementation. The performance of TPN against nonmaneuvering target or the maneuvering target with a specific acceleration had been analyzed before. However, the obtained results are not suitable for the realistic exoatmospheric interception scenario,since the target may maneuver along an arbitrary direction with an arbitrary but upper-bounded acceleration in the threedimensional(3 D) space, which is the so-called 'true-arbitrarily maneuvering target' in this paper. With the help of the line-ofsight(LOS) rotation coordinate system, the performance of 3 D TPN against the true-arbitrarily maneuvering target is thoroughly analyzed using the Lyapunov-like approach. The upper-bound of the 3 D LOS rate is obtained, and so is that of the commanded acceleration of 3 D TPN. After that, the capture region of 3 D TPN is presented on the initial relative velocity plane. The nonlinear3 D relative kinematics between the interceptor and the target is taken into full account. Finally, the new theoretical findings are demonstrated by numerical simulations. | LI KeBo LIANG YanGang SU WenShan CHEN Lei | 2018 | Science China(Technological Sciences)2018，61，8： | 9 |
| 5 | A novel biased proportional navigation guidance law for close approach phase显示文摘A novel biased proportional navigation guidance(BPNG) law is proposed for the close approach phase, which aims to make the spacecraft rendezvous with the target in specific relative range and direction. Firstly, in order to describe the special guidance requirements, the concept of zero effort miss vector is proposed and the dangerous area where there exists collision risk for safety consideration is defined. Secondly, the BPNG, which decouples the range control and direction control, is designed in the line-of-sight(LOS) rotation coordinate system. The theoretical analysis proves that BPNG meets guidance requirements quite well. Thirdly, for the consideration of fuel consumption, the optimal biased proportional navigation guidance(OBPNG) law is derived by solving the Schwartz inequality. Finally, simulation results show that BPNG is effective for the close approach with the ability of evading the dangerous area and OBPNG consumes less fuel compared with BPNG. | Su Wenshan Yao Dangnai Li Kebo Chen Lei | 2016 | Chinese Journal of Aeronautics2016，29，1： | 5 |
| 6 | Retrieve Sea Surface Salinity Using Principal Component Regression Model Based on SMOS Satellite Data显示文摘The sea surface salinity(SSS) is a key parameter in monitoring ocean states. Observing SSS can promote the understanding of global water cycle. This paper provides a new approach for retrieving sea surface salinity from Soil Moisture and Ocean Salinity(SMOS) satellite data. Based on the principal component regression(PCR) model, SSS can also be retrieved from the brightness temperature data of SMOS L2 measurements and Auxiliary data. 26 pair matchup data is used in model validation for the South China Sea(in the area of 4?–25?N, 105?–125?E). The RMSE value of PCR model retrieved SSS reaches 0.37 psu(practical salinity units) and the RMSE of SMOS SSS1 is 1.65 psu when compared with in-situ SSS. The corresponding Argo daily salinity data during April to June 2013 is also used in our validation with RMSE value 0.46 psu compared to 1.82 psu for daily averaged SMOS L2 products. This indicates that the PCR model is valid and may provide us with a good approach for retrieving SSS from SMOS satellite data. | ZHAO Hong LI Changjun LI Hongping LV Kebo ZHAO Qinghui | 2016 | Journal of Ocean University of China2016，15，3： | 5 |
| 7 | Biocatalytic access to diverse prenylflavonoids by combining a regiospecific C-prenyltransferase and a stereospecific chalcone isomerase显示文摘Prenylflavonoids are valuable natural products that have diverse biological properties, and are usually generated biologically by multiple metabolic enzymes in nature. In this study, structurally diverse prenylflavonoids were conveniently synthesized by enzymatic catalysis by combining GuILDT, a regiospecific chalcone prenyltransferase, and Gu CHI, a stereospecific chalcone isomerase that has promiscuous activity for both chalcones and prenylchalcones as substrates. Our findings provided a new approach for the synthesis of natural/unnatural bioactive prenylflavonoids, including prenylchalcones and optical prenylflavanones with chalcone origins. | Jianhua Li Ridao Chen Ruishan Wang Xiao Liu Kebo Xie Dawei Chen Jungui Dai | 2018 | Acta Pharmaceutica Sinica B2018，8，4： | 4 |
| 8 | Review on strategies of space-based optical space situational awareness显示文摘Space-based optical(SBO)space surveillance has attracted widespread interest in the last two decades due to its considerable value in space situation awareness(SSA).SBO observation strategy,which is related to the performance of space surveillance,is the top-level design in SSA missions reviewed.The recognized real programs about SBO SAA proposed by the institutions in the U.S.,Canada,Europe,etc.,are summarized firstly,from which an insight of the development trend of SBO SAA can be obtained.According to the aim of the SBO SSA,the missions can be divided into general surveillance and space object tracking.Thus,there are two major categories for SBO SSA strategies.Existing general surveillance strategies for observing low earth orbit(LEO)objects and beyond-LEO objects are summarized and compared in terms of coverage rate,revisit time,visibility period,and image processing.Then,the SBO space object tracking strategies,which has experienced from tracking an object with a single satellite to tracking an object with multiple satellites cooperatively,are also summarized.Finally,this paper looks into the development trend in the future and points out several problems that challenges the SBO SSA. | HU Yunpeng LI Kebo LIANG Yan’gang CHEN Lei | 2021 | Journal of Systems Engineering and Electronics2021，32，5： | 3 |
| 9 | Performance analysis of three-dimensional differential geometric guidance law against low-speed maneuvering targets显示文摘The performance of the three-dimensional differential geometric guidance law with proportional navigation formation against a target maneuvering arbitrarily with time-varying normal acceleration is thoroughly analyzed using the Lyapunov-like approach.The validation of this guidance law is firstly proved,and then the performance issues such as capturability,heading error control efficiency,line of sight rate convergence,and commanded acceleration requirement are analyzed,under the condition that the missile is initially flying toward the target with a speed advantage.It is proved that an intercept can occur and the line of sight rate and missile commanded acceleration can be limited in certain ranges,if the initial heading error is small and the navigation gain is sufficiently large.The nonlinear relative dynamics between the missile and the target is taken into full account,and the analysis process is simple and intuitive,due to the use of a convenient line of sight rotating coordinate system.Finally,the new theoretical findings are validated by numerical simulations. | Kebo Li Wenshan Su Lei Chen | 2018 | Astrodynamics2018，2，3： | 3 |
| 10 | Combinatorics on Words in Symbolic Dynamics:The Quadratic Map显示文摘这篇论文被贡献女士的组合性质定序,它是在间隔上定义的二次的地图的周期的按摩词。给定的长度的女士序列上的毗邻关系的明确的表情被建立。 | Wan Ji DAI Kebo LU Jun WANG | 2008 | Acta Mathematica Sinica,English Series2008，24，12： | 3 |
| 11 | Combinatorics on Words in Symbolic Dynamics:the Antisymmetric Cubic Map显示文摘这篇论文被贡献反对称的立方的地图的周期的按摩词的组合性质在间隔上定义。给定的长度的最少的词,在如此的词的一些集合的给定的长度和同等值选择性质的词上的毗邻关系被建立。 | Wan Ji DAI Kebo LU Jun WANG | 2008 | Acta Mathematica Sinica,English Series2008，24，11： | 3 |
| 12 | Capturability of 3D RTPN guidance law against true-arbitrarily maneuvering target with maneuverability limitation显示文摘The capturability of the Three-Dimensional(3D)Realistic True Proportional Navigation(RTPN)guidance law is thoroughly analyzed.The true-arbitrarily maneuvering target is considered,which maneuvers along an arbitrary direction in 3D space with an arbitrary but upperbounded acceleration.The whole nonlinear relative kinematics between the interceptor and target is taken into account.First,the upper-bound of commanded acceleration of 3D RTPN is deduced,using a novel Lyapunov-like approach.Second,the reasonable selection range of navigation gain of3D RTPN is analyzed,when the maneuver limitation of interceptor is considered.After that,a more realistic definition of capture is adopted,i.e.,the relative range is smaller than an acceptable miss-distance while the approaching speed is larger than a required impact speed.Unlike previous researches which present Two-Dimensional(2D)capture regions,the inequality analysis technique is utilized to obtain the 3D capture region,where the three coordinates are the closing speed,transversal relative speed,and relative range.The obtained capture region could be taken as a sufficient-but-unnecessary condition of capture.The new theoretical findings are all given in explicit expressions and are more general than previous results. | Kebo LI Zhihui BAI Hyo-Sang SHIN Antonios TSOURDOS Min-Jea TAHK | 2022 | Chinese Journal of Aeronautics2022，35，7： | 2 |
| 13 | Enzymatic biosynthesis of benzylisoquinoline alkaloid glycosides via promiscuous glycosyltransferases from Carthamus tinctorius显示文摘Enzymatic glycosylation catalyzed by glycosyltransferases (GTs) has great potential in creating diverse novel and bioactive glycosides. Herein, three new GTs (UGT84 A33, UGT71 AE1 and UGT90 A14) from Carthamus tinctorius exhibited robust catalytic promiscuity to benzylisoquinoline alkaloids, and were used as enzymatic tools in glycosylation of bioactive benzylisoquinoline alkaloids. Seven novel benzylisoquinoline alkaloids O-glycosides were synthesized with high efficiency. These studies indicate the significant potential of promiscuous GTs in synthesis of benzylisoquinoline alkaloids glycosides for drug discovery. | Yujiao Zhang Kebo Xie Aijing Liu Ridao Chen Dawei Chen Lin Yang Jungui Dai | 2019 | Chinese Chemical Letters2019，30，2： | 2 |
| 14 | A Relative Entropy based approach to image thresholding显示文摘 | Chang Chein I Chen Kebo Wang Jianwei | 1994 | Pattern Recognition1994，27，9： | 1 |
| 15 | A novel biased proportional navigation guidance law for close approach phase显示文摘 | Wenshan Su Dangnai Yao Kebo Li Lei Chen | 2015 | Chinese Journal of Aeronautics2015，，： | 1 |
| 16 | Image processing for industrial radiograph inspection: image enhancement显示文摘 | Keboe A Parker G A | 1990 | British Journal of NDT1990，32，4： | 1 |
| 17 | The Alimentary Therapy for Hyperlipemia Complicated with NIDDM显示文摘TheAlimentaryTherapyforHyperlipemiaComplicatedwithNIDDM￥LiuYaofen;WuYongping;ZhangLijiao.ACTAACADEMIAEMEDICINAENANJING.1995,1... | Wang Kebo,et al. | 1995 | The Journal of Biomedical Research1995，19，1： | 1 |
| 18 | Factor analysis of interceptor capture probability显示文摘The capture probability of interceptors has been deeply studied.Firstly,the definition of capture probability is analyzed.It is transformed into calculating the probability that the relative position vector between the target and the interceptor locates in a certain cone.The relative position vector and associated covariance matrix are projected in line-of-sight coordinates,and the 3-dimensional integral of a probability function in a cone is calculated to obtain the capture probability.The integral equation is a complicated expression of probability,and it is simplified to an explicit approximate expression according to some assumptions based on the characteristics of the engineering problems.The approximation precision is analyzed by comparative simulation difference,which indicates that approximate assumptions are reasonable.Utilizing the explicit expression,the characteristics of capture probability are analyzed respectively with the factors,such as the distance between the interceptor and the target,the precision of relative position vector,the maximum capture distance and the maximum field angle of interceptor seeker. | Lei Chen Zhijun Gu Xianzong Bai Kebo Li | 2011 | Journal of Systems Engineering and Electronics2011，22，6： | 1 |
| 19 | A relative entropy-based approach to image threshold- ing显示文摘 | Chein-I Chang Kebo Chen Jianwei Wang Mark L G Alt- house | 1994 | Pattern Recognition1994，27，9： | 1 |
| 20 | Image processing for industrial radiograph inspection:Image enhancement显示文摘 | KEBOE A PARKER G A | 1990 | British Journal of NDT1990，32，4： | 1 |
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