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Journal of Systems Engineering and Electronics 2022年第5期33卷 1195-1209页

作者： ZHANG Zhuanhua zhou gongjian School of Electronics and Information Engineering Harbin Institute of TechnologyHarbin 150001China

The state estimation of a maneuvering target,of which the trajectory shape is independent on dynamic characteristics,is *** conventional motion models in Cartesian coordinates imply that the trajectory of a target is completely determined by its dynamic ***,this is not true in the applications of road-target,sea-route-target or flight route-target tracking,where target trajectory shape is uncoupled with target velocity *** this paper,a new estimation algorithm based on separate modeling of target trajectory shape and dynamic characteristics is *** trajectory of a target over a sliding window is described by a linear function of the arc *** determine the unknown target trajectory,an augmented system is derived by denoting the unknown coefficients of the function as states in mileage *** every estimation cycle except the first one,the interaction(mixing)stage of the proposed algorithm starts from the latest estimated base state and a recalculated parameter vector,which is determined by the least squares(LS).Numerical experiments are conducted to assess the performance of the proposed *** results show that the proposed algorithm can achieve better performance than the conventional coupled model-based algorithms in the presence of target maneuvers.

关键词： maneuvering target tracking separate modeling natural parametric function interacting multiple model(IMM)filter data fitting state augmentation

Track-before-detect for bistatic radar based on pseudo-spectrum

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Chinese Journal of Aeronautics 2024年第1期37卷 236-246页

作者： Tao HAN gongjian zhou School of Electronics and Information Engineering Harbin Institute of TechnologyHarbin 150001China Key Laboratory of Marine Environmental Monitoring and Information Processing Ministry of Industry and Information TechnologyHarbin 150001China

Track-Before-Detect(TBD) is an efficient method to detect dim targets for radars. Conventional TBD usually follows an approximate motion model of the target, which may cause an inaccurate integration of the target energy. A TBD technique on basis of pseudo-spectrum in mixed coordinates adopting an accurate motion model for bistatic radar system is developed in this *** predicted position in bistatic polar plane is derived according to a nonlinear function that exactly describes the constant Cartesian velocity motion. Then around the predicted position, a pseudo-spectrum is formulated and its samples are accumulated to the integration frame for energy integration. The evolution of the state and the procedure of accumulation of the target energy are derived elaborately. The superior performance of the proposed method is demonstrated by some simulations.

关键词： Weak target detection Bistatic radar Track-before-detect Pseudo-spectrum Multiframe integration

Multiframe track-before-detect method based on velocity filtering in mixed coordinates

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Journal of Systems Engineering and Electronics 2022年第2期33卷 247-258页

作者： WANG Liangliang zhou gongjian School of Electronics and Information Engineering Harbin Institute of TechnologyHarbin 150001China Key Laboratory of Marine Environmental Monitoring and Information Processing Ministry of Industry and Information TechnologyHarbin 150001China

In this paper,a velocity filtering based track-before-detect algorithm in mixed coordinates is presented to address the problem of integration loss caused by inaccurate motion model in polar coordinate *** the motion of a con-stant velocity(CV)target is better modeled in Cartesian coordi-nates,the search of measurements for integration in polar sensor coordinates is carried out according to the CV model in Cartesian coordinates instead of an approximate model in polar sensor *** position of each cell is converted into Cartesian coordinates and predicted according to an assumed ***,the predicted Cartesian position is converted back to polar sensor coordinates for multiframe *** use of the correct model improves integration effectiveness and consequently improves algorithm *** handle the weak target with unknown velocity,a velocity filter bank in mixed coordinates is *** influence of velocity mis-match on the performance of filter bank is analyzed,and an effi-cient strategy for filter bank design is *** re-sults are presented to demonstrate the effectiveness of the pro-posed algorithm.

关键词： mixed coordinate approach velocity filtering multiframe integration weak target detection polar sensor coordinate

Multiframe weak target track-before-detect based on pseudo-spectrum in mixed coordinates

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Chinese Journal of Aeronautics 2022年第5期35卷 97-113页

作者： Liangliang WANG gongjian zhou Thiagalingam KIRUBARAJAN School of Electronics and Information Engineering Harbin Institute of TechnologyHarbin 150001China Key Laboratory of Marine Environmental Monitoring and Information Processing Ministry of Industry and Information TechnologyHarbin 150001China Department of Electrical and Computer Engineering McMaster UniversityONHamilton L8S 4K1Canada

Traditional multiframe Track-Before-Detect(TBD)may incur adverse integration loss resulting from model mismatch in sensor *** suboptimal integration strategy may cause target envelope *** address these issues,a pseudo-spectrum-based multiframe TBD in mixed coordinates is proposed *** data search for energy integration is conducted based on an accurate model in the x-y plane while target energy is integrated based on pseudo-spectrum in sensor *** algorithm performance is improved since the model mismatch is eliminated,and the pseudo-spectrum based integration facilitates well maintained target *** detailed multiframe integration procedure and theoretical target integrated envelope are ***,to cope with the unknown target velocity,a velocity filter bank based on pseudo-spectrum in mixed coordinates is *** effect of velocity mismatch on algorithm performance is analyzed and an efficient method for filter bank design is ***,a parameter estimation method using characteristics of integrated envelope is presented for improved target polar position and Cartesian velocity ***,numerical results are provided to demonstrate the effectiveness of the proposed method.

关键词： Mixed coordinates Multiframe detection Pseudo-spectrum Track-before-detect Weak target detection

State estimation in range coordinate using range-only measurements

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Journal of Systems Engineering and Electronics 2022年第3期33卷 497-510页

作者： LI Keyi GUO Zhengkun zhou gongjian School of Electronics and Information Engineering Harbin Institute of TechnologyHarbin 150001China

In some tracking applications,due to the sensor characteristic,only range measurements are *** this is the case,due to the lack of full position measurements,the observability of Cartesian states(e.g.,position and velocity)are limited to particular *** general cases,the range measurements can be utilized by developing a state estimation algorithm in range-Doppler(R-D)plane to obtain accurate range and Doppler *** this paper,a state estimation method based on the proper dynamic model in the R-D plane is *** unscented Kalman filter is employed to handle the strong nonlinearity in the dynamic *** filtering initialization methods are derived to extract the initial state estimate and the initial covariance in the R-D plane from the first several range *** is derived based on the well-known two-point differencing *** other incorporates the correct dynamic model information and uses the unscented transformation method to obtain the initial state estimates and covariance,resulting in a model-based method,which capitalizes the model information to yield better *** Carlo simulation results are provided to illustrate the effectiveness and superior performance of the proposed state estimation and filter initialization methods.

关键词： range-only measurement state estimation filter initialization target tracking unscented Kalman filter(UKF)

Sequential nonlinear tracking filter without requirement of measurement decorrelation

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Journal of Systems Engineering and Electronics 2015年第6期26卷 1135-1141页

作者： gongjian zhou Junhao Xie Rongqing Xu Taifan Quan School of Electronics and Information Engineering Harbin Institute of Technology

Sequential measurement processing is of benefit to both estimation accuracy and computational efficiency. When the noises are correlated across the measurement components, decorrelation based on covariance matrix factorization is required in the previous methods in order to perform sequential updates properly. A new sequential processing method, which carries out the sequential updates directly using the correlated measurement components, is proposed. And a typical sequential processing example is investigated, where the converted position measure- ments are used to estimate target states by standard Kalman filtering equations and the converted Doppler measurements are then incorporated into a minimum mean squared error （MMSE） estimator with the updated cross-covariance involved to account for the correlated errors. Numerical simulations demonstrate the superiority of the proposed new sequential processing in terms of better accuracy and consistency than the conventional sequential filter based on measurement decorrelation.

关键词： sequential filter Doppler measurement measurementdecorrelation minimum mean squared error (MMSE).

A Tracking Filter in Spherical Coordinates Enhanced by De-noising of Converted Doppler Measurements

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Chinese Journal of Aeronautics 2012年第5期25卷 757-765页

作者： zhou gongjian YU Changjun CUI Naigang QUAN Taifan School of Electronics and Information Engineering Harbin Institute of Technology Harbin 150001 China School of Information and Electronic Engineering Harbin Institute of Technology at Weihai Weihai 264209 China School of Astronautics Harbin Institute of Technology Harbin 150001 China

Tracking problem in spherical coordinates with range rate （Doppler） measurements, which would have errors correlated to the range measurement errors, is investigated in this paper. The converted Doppler measurements, constructed by the product of the Doppler measurements and range measurements, are used to replace the original Doppler measurements. A de-noising method based on an unbiased Kalman filter （KF） is proposed to reduce the converted Doppler measurement errors before updating the target states for the constant velocity （CV） model. The states from the de-noising filter are then combined with the Cartesian states from the converted measurement Kalman filter （CMKF） to produce final state estimates. The nonlinearity of the de-noising filter states are handled by expanding them around the Cartesian states from the CMKF in a Taylor series up to the second order term. In the mean time, the correlation between the two filters caused by the common range measurements is handled by a mini- mum mean squared error （MMSE） estimation-based method. These result in a new tracking filter, CMDN-EKF2. Monte Carlo simulations demonstrate that the proposed tracking filter can provide efficient and robust performance with a modest computa- tional cost.

关键词： target tracking converted Doppler range rate nonlinear Kalman filtering

HF radar sea clutter rejection by nonlinear projections

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Journal of Systems Engineering and Electronics 2005年第4期16卷 733-737页

作者： zhou gongjian Jin Yonggao Dong Huachun Quan Taifan Inst. of Electronic Engineering Harbin Inst. of Technology Harbin 150001 P. R. China Dept. of Electronic Information Engineering Coll. of Science and Engineering Yanbian Univ. Yanji 133002 P. R. China

In the background of signal detection for high frequency （I/F） radar, the sea clutter is quite significant and can mask some weak target signals. A new clutter rejection method named “nonlinear projection” is given to improve the SNR of the target. This approach is based on the recent observation that HF sea clutter may be modeled as a nonlinear deterministic dynamical system. After approximating the multidimensional reconstruction of the clutter by a low-dimensional attractor, projections onto this attractor can separate the clutter from other components. Real sea clutter, simulated target data and real target data are used to show that a nonlinear clutter rejection method is a promising technique to suppress sea clutter and enhances target detection.

关键词： HF radar target detection clutter rejection nonlinear projection.

Complex Motion Modeling and State Estimation in Road Coordinates

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Journal of Harbin Institute of Technology(New Series) 2017年第1期24卷 19-25页

作者： Keyi Li Xi Chen gongjian zhou School of Electronics and Information Engineering Harbin Institute of TechnologyHarbin 150001China

Constrained modeling and state estimation have attracted much attention in recent years. This paper focuses on target motion modeling and tracking in road coordinates. An improved initialization method,which uses the optimal fusion of the position measurements in different directions,is presented for the constraint coordinate Kalman filter(CCKF). The CCKF is evaluated with a comprehensive comparison to the state-of-art linear equality constraint estimation methods. Numerical simulation results demonstrate the better performance of the CCKF. Then the interacting multiple model CCKF(IMM-CCKF) is proposed to manifest the advantages of the CCKF in complex motion modeling and state estimations. The effectiveness of the IMM-CCKF in maneuvering target tracking with spatial equality constraints is demonstrated by numerical experiments.

关键词： Ground Targets Motion modeling Road Constraints Initialization IMM

Rapid growth and sterility of growth hormone gene transgenic triploid carp

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Chinese Science Bulletin 2011年第16期56卷 1679-1684页

作者： YU Fan XIAO Jun LIANG XiangYang LIU ShaoJun zhou gongjian LUO KaiKun LIU Yun HU Wei WANG YaPing ZHU ZuoYan Key Laboratory of Protein Chemistry and Fish Developmental Biology of Education Ministry of China College of Life Sciences Hunan Normal University Changsha 410081 China State Key Laboratory of Freshwater Ecology and Biotechnology Institute of Hydrobiology Chinese Academy of Sciences Wuhan 430072 China

Triploid carp(100%)with 150(3n=150)chromosomes were obtained by crossing the females of improved tetraploid hybrids(♀, 4n=200)of red crucian carp(♀)×common carp(♂)with the males of diploid yellow river carp(♂,2n=100).The crosses yielded transgenic triploid carp(positive triploid fish,44.2%of the progeny)and non-transgenic triploid carp(negative triploid fish). Histological examination of the gonads of 24-month-old positive triploid fish suggested they were sterile and the fish were not able to produce mature gametes during the breeding ***,both the positive and negative triploid fish were *** had a spindle-shaped,laterally compressed,steel grey body with two pairs of *** of the quantifiable traits of the triploid carp were intermediate between those of the two *** positive and negative triploid fish were raised in the same pond for 2 *** mean body weight of the positive triploid fish was 2.3 times higher than the negative triploid *** weight of the largest positive triploid fish was 2.91 times higher than that of the largest negative triploid ***,we produced fast-growing transgenic triploid carp that have a reduced ecological risk because of their inability to mate and produce progeny.

关键词：三倍体鱼黄河鲤鱼非转基因生长激素基因不育组织学检查横向压缩量化特征