Table of Content

30 September 2003, Volume 24 Issue 3

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Paper

Dynamic Simulation of Tracked Vehicle Steering Performance

1：Shi Lichen, Wang Liangxi；2：Zhang Bingzhi

2003, 24(3):  289-293.  doi:10.3969/j.issn.1000-1093.2003.03.001

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Generalized method of the dynamic analysis of mechanical system was used for tracked vehicle steering performance, and global coordinates, relative coordinates and body-fixed coordinates were built up to describe the motion and relations between the tracked-vehicle and ground. The factors, such as the cen?trifugal force etc. to vehicle steering performance, were considered and analyzed to acquire a dynamic model of tracked vehicle on hard level ground, and the corresponding digital simulation carried out. The compari?son of low speed steering result between digital simulation and field tests was made which indicated that the mathematical model is acceptable, while the high speed steering performance with centrifugal force effect is compared to that without centrifugal force effect, to represent the importance of centrifugal force for high speed steering response.

Application of Load Spectrum on the Tank

1:Chen Qiansheng, Wang Zhigang, Fan Zhiyou;2:Zhao Hua

2003, 24(3):  294-298.  doi:10.3969/j.issn.1000-1093.2003.03.002

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In combination of theory with test，the fatigue life oi the tank gear box was estimated by the action of the load spectrum and then the life of the gear box was greatly increased using the thread hole op?timization coia-extruded strengthening technology based on the load spectrum. Being different from the tra?ditional life estimation, tlie formula of the long-period fatigue life was established on the basis of the Weibull σ-N curve formula and linear fatigue damage accumulative law. Through the life estimation with the formu?la, the result and test of life estimation are conformed with the real application. According to the theory analysis and test result, the load spectrum is the most important basic data for the reliability design and reli?ability increasement of tanks.

A Study on the Towing Dynamics of a Howitzer

Wang Xianhui, He Yong ,Gao Shuzi

2003, 24(3):  299-303.  doi:10.3969/j.issn.1000-1093.2003.03.003

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The running dynamical response of a towed howitzer was studied applying the Lagrangian method. A dynamical model having 23 degrees of freedom was given to study the response caused by road irregularities. A computer program has been written for the simulation of response on various road condi?tions and analysis of dynamical response at the discrete excitation. Attention was paid to the response of some critical parts of the howitzer. Tests were carried out to validate the results, and the test results are in good accord with the results of calculation.

One Dimensional Numerical Simulation of Ablation-Capillaries Plasma Generator

Cheng Jian, Li Booming

2003, 24(3):  304-308.  doi:10.3969/j.issn.1000-1093.2003.03.004

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Ablation-capillaries plasma generator is a basic composition element in an electrothermal launching system. For a standard ablated material—polyethylene, one dimentional governing equations for the plasma generator were established and solved with the MacCormack explicit-implicit method. Charac?teristic parameters of discharge and the process of one-dimensional flow in the plasma generator were calcu?lated. Through experiments the hypothesis and model were confirmed. This model can be used for forecast?ing the performance of the plasma generator.

Trajectory Susceptivity for a One-Dimensional Trajectory Correction Fuze

Li Dongguang, Zhou Guoyong, Ma Baohua

2003, 24(3):  309-312.  doi:10.3969/j.issn.1000-1093.2003.03.005

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Based on the conclusion that a trajectory can be determined through a measurement of the minimum velocity (Vmin) and the time (tVmin)of the minimum velocity point on its trajectory, and a trajec?tory susceptivity system was thus built up. A micro-controller is used as the core of the system. A MEMS pressure transducer is employed to sense the air pressure applied on the shell top. This pressure value is con?verted to the axial velocity of the shell. A timer inside the micro controller is used for the precise timing to determine tVmin, Under the control of the microcontroller，a correction value is obtained, and a signal is provided to the trajectory correction system. The trajectory susceptivity system is proved to be feasible both in theory and practice by wind tunnel experiments performed under several Mach numbers.

A Study on a Turns-Counting Sensor Based on Geomagnetism

Shen Bo, Huang Xiaomao, Wang Zhixing, Chen Hejuan, Lai Baitan

2003, 24(3):  313-315.  doi:10.3969/j.issn.1000-1093.2003.03.006

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Mathematical model of a geomagnetism turns-counting sensor was estabnsned, and the method of calculation of induced electromotive force was deduced in theory. Applications of this sensor was discussed and its blind area analyzed. Basic structure of the sensor was thus provided. The sensor has been used in a warhead in experiment and obtained ideal data. It is expected to be used m projectiles to realize the fixea-instance explosion.

A Study of Fragments Penetrating and Detonating a Target Missile

Hong Jianhua, Liu Tong

2003, 24(3):  316-321.  doi:10.3969/j.issn.1000-1093.2003.03.007

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An analytic method of practical value was recommended and a series of formulas of ultimate velocity on penetrating target plates deduced, based on the principle from fragments of fragmentation war?head detonating a target missile. Detonatiory of charge behind the target plate is then studied, and a formu?la for calculating the detonation velocity is educed. At last, correctness and feasibility was validated by ex?perimentation.

Ability of Anti-Tactical Ballistic Missile Fuze in Intercepting Air Targets

Zhuang Zhizhong, Wang Hongbo, Zhang Qingtai

2003, 24(3):  322-325.  doi:10.3969/j.issn.1000-1093.2003.03.008

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The main task of an anti tactical ballistic missile lies in intercepting tactical ballistic missiles. High relative speed of the missile and target and the small radar cross-section of the tactical ballistic missile greatly intensify the difficulty oi interception. The air-intercept ability of a high-speed fragments warhead equipped with side-looking fuze and the limitations in the choice of fuze parameters and the design under the condition of high-speed encounter were introduced. The difficulty in joining low speed fragments warhead with side-looking fuze as well as the application of guidance integrated fuze technology were proposed. Time delay fuzing algorithm and the selection of beginning point in GIF technology were also discussed.

Application of a Wavelet-Based Integrated Filter in the Strapdown Inertial North-Finder

Liang Junyu, Xie Ling, Wang Xiaorui ,Chen Jiabin

2003, 24(3):  326-329.  doi:10.3969/j.issn.1000-1093.2003.03.009

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The pyramidical Mallat algorithm of orthogonal dyadic wavelet transformation and its applica?tion in a wavelet-based integrated filter were introduced. The filter is applied to the strapdown inertial north finder to eliminate the periodic noise and random disturbance. The simulation results based on field sampled signals show more effectiveness of the new integrated filter on restraining the dynamic disturbances when compared with the conventional boxcar window FIR.

Suppression of Shortwave Jamming for the over the Horizon Radar

1:Li Zongqiang ,Gu Hong, Su Weimin;2:Zhou Wenyu

2003, 24(3):  330-333.  doi:10.3969/j.issn.1000-1093.2003.03.010

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The over the horizon radar (OTHR) can sometimes be interfered seriously by the shortwave radio station. So the random binary phase coded (RBPC）CW radar was presented to be used in OTHR for the property improvement of anti-jamming, rhe characteristics of the RBPC CW radar and the LFM CW radar in case of the shortwave radio station jamming were analyzed. The computer simulation shows that the RBPC CW radar has better property of suppression of shortwave jamming than the LFM CW radar.

Correction of Error in the Center of Rotation of Fan-Beam Filter Back Projection Algorithms

Fu Jian, Lu Hongnian

2003, 24(3):  334-337.  doi:10.3969/j.issn.1000-1093.2003.03.011

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Filter back-projection (FBP) reconstruction algorithm is adopted by fan-beam industrial CT systems. This algorithm requires the center of rotation of the scan inspection platform to be identical with the reconstruction center of the FBP algorithm. This requirement is hardly satisfied in full under the accu?racy restriction of the scanning system. Consequently a kind of artifact called double-shadow exhibits itself in reconstruction images. A method of correction is presented to reduce the artifacts. The validity of the method is verified by computer simulation results and experiments. This method is valuable to the debug?ging of industrial CT scanning systems.

Effect of Charge Coupled Device Integration Time on the Imaging Quality of a Micro Imaging System

Song Yong, Hao Qun, Wang Yongtian

2003, 24(3):  338-341.  doi:10.3969/j.issn.1000-1093.2003.03.012

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When the numerical aperture of a lens is fixed,it is important to select the correct CCD inte?gration time in order to improve the imaging quality of a micro imaging system and enhance the reconnais?sance ability of micro air vehicles. The main factors affecting the CCD integration time were analyzed. A study was made on the relationship between the CCD integration time of a micro imaging system used in MAVs ana its image smear, and a mathematical model to calculate and analyze the image smear was estab?lished. The model is used for evaluating the quality of moving images captured in different CCD integration time. The experimental results indicate that when the image smear is limited to a single pixel, high quality moving images can be obtained on the condition that the exposure is appropriate.

Visual Range of Low Light Level Night Vision Goggles for Drivers

Liu Lei, Chang Benkang, Li Wei

2003, 24(3):  342-346.  doi:10.3969/j.issn.1000-1093.2003.03.013

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The fundamentals about the visual range of a low light level imaging system were discussed. Based on the common apparent distance detection equation, a more practicable and reliable detection equa?tion was established using factors, such as atmospheric transmissivity，spectral matching factor, etc. Ac?cording to the revised apparent distance detection equation and combined with the research aim and design principle of night vision goggles, the relationship of parameters having influence on the performance of sys?tems were analyzed. The visual range of the goggle under specific circumstances was estimated, it is shown that the revised apparent distance detection equation is effective and the design of the system is feasible.

A Study on Digital Servo Focus Displacement Sensor

Li Dan, Yang Liangen, Xie Tiebang

2003, 24(3):  347-350.  doi:10.3969/j.issn.1000-1093.2003.03.014

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An instrument for 3D bullet marks identification based on displacement sensor of digital servo control was proposed. The basic principle, structure, control system and experimental results of the instru?ment were discussed. The vertical scope of measurement, the vertical differentiating rate and the focusing spectrum diameter are 土 1mm，30nm and 1μm respectively. It has been proven that the general perfor?mance is superior to the bullet marks measuring system developed by the research team previously.

Aliasing Phencanenon in Electron Bombardmait Charge Couplea Device Imaging

Zuo Fang, Gao Zhiyun, Liu Mingqi,Su Meikai ,Zhou Liwei

2003, 24(3):  351-353.  doi:10.3969/j.issn.1000-1093.2003.03.015

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Research and experiments into limited resolution of EBCCD have been done to test it. Rules in EBCCD imaging for resolution chart (stripe pattern) of different frequencies have been found. It is possible to output stripe pattern images even if the frequency of input chart is higher than the Nyquist limiting fre?quency of the system (the phenomenon of aliasing) ? It can be explained by the frequency spectrum. Modu?lation transfer function has been tested. It shows that EBCCD system has a certain imaging ability for a high frequency image (higher than the Nyquist frequency). This provides the possibility of the EBCCD sys?tem in imaging for the resolution chart of a high frequency.

A Study on the Simulated Design of Launching Valve for Underwater Compressed-Air Launcher

Lian Yongqing, Wang Shuzong, Chen Yidiao

2003, 24(3):  354-358.  doi:10.3969/j.issn.1000-1093.2003.03.016

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A method for the simulated design of launching valve for the compressed-air launcner was put forward, that can attain the designed trajectory. Three mathematical models including interior trajectory model, launching valve opening area calculation model and launching valve design model were established. The method and mathematical models have been tested on the simulation design of the shape of the aperture with a launching valve, and proved its availability for the optimal design of the launching valve.

Design of a Sliding Observer for a Missile

Song Jianmei

2003, 24(3):  359-362.  doi:10.3969/j.issn.1000-1093.2003.03.017

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The aim of the paper is to observe the pitch angle rate of variation of a missile. After compar?ing among the Luenberger observer, Utkm observer, Walcott-Zak observer and synthetic sliding observer， the paper makes use of the synthetic sliding observer successfully to estimate the pitch angle rate of a missile when the missile attacks a tank target. Simulation results show that the observed curve is very similar to the real variable. Synthetic sliding observer can effectively observe the state of missile whose dynamic parame?ters are time-varying and uncertain, and the design of the observer is simple and can be realized easily.

A Study on the Design for the Missile Rotational Speed Adjustment Boards

1:Guan Weiqun;2:Zhang Jing

2003, 24(3):  363-366.  doi:10.3969/j.issn.1000-1093.2003.03.018

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The idea and method of design for the missile rotational speed adjustment boards were stud?ied. Based on the results of analysis of the design restrictions, parameters design schemes of the boards were proposed and compared by aerodynamics characteristic calculations and rotational speed simulations. The method of design of the boards was finally concluded. Study results showed that the design for missile rota?tional speed adjustment boards is a systematic engineering problem involving missile body structure, aerody?namics, and missile system design.

Evaluation and Analysis of Small-Sample Missile Test Based on Characteristic Variables

Duan Xiaojun, Wang Zhengming

2003, 24(3):  367-372.  doi:10.3969/j.issn.1000-1093.2003.03.019

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Aimed at the need, of test and evaluation of missiles and considering its trajectory characteris?tics, a model was constructed making full use of tracking data, shooting range test data and other prior in?formation .By virtue of Bayesian theory and the sequential analysis technique, a new evaluation method was put forth to study the accuracy and reliability of the missile test，which is on the basis oi investigating dif?ferent prior and constructing three different characteristic variables. Those characteristic variables embody features of the same type of missile in many tests. Theoretical analysis and simulation show that this method can make full use of test resources and provide evaluation results with high accuracy.

Numerical Simulation on the Penetration of Hybrid Fibre-Reinforced Composite Laminates by Fragments and Its Experimental Verification

Mei Zhiyuan, Zhu Xi, Liu Yanhong

2003, 24(3):  373-377.  doi:10.3969/j.issn.1000-1093.2003.03.020

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A physical F. E model for the hybrid fiber-reinforced composite laminates composed of Glass-2 /Twaron750 fiber and PC matrix under ballistic impact loading has been built up on the basis of experimen- tal results. In this model, the deformation of target and the effect of all parts of hybrid laminates have been considered. The calculation praxis include the following three cases, viz. ： (I) when the interlaminate con?joint force have been considered; (2) when the interlaminate conjoint force have not been considered, yet the interlaminate contact have been considered;(3) when the thermal effect have been considered. The nu?merical simulation results by this model agreed well with both the experimental performance and the experi?mental values, especially in case (3) ? It is of engineering significance to understand the role of each part of composite laminates on the ballistic resistibility, and to optimize the structure of target in engineering.

Dynamic Behavior of Tungsten Alloy Forged with Large Deformation

Li YingLei ***, Hu Shisheng*, Wei Zhigang*,Shi Honggang ***,Feng Hongwei ***

2003, 24(3):  378-380.  doi:10.3969/j.issn.1000-1093.2003.03.021

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The stress-strain relationships of tungsten alloy forged with 60% deformation and sintered tungsten alloy were measured. The strain rate ranges from 4 X 10-4s一1 to 4 X 1O3S-1. By these experi?ments, the forged tungsten was found to be anisotropic and more likely to fail along the direction of forg?ing. At the same time, the stress strength of forged tungsten alloy was found to be higher than the sintered tungsten alloy. Associating with the research of Magness, the increase of penetration depth of forged tung?sten alloy armor-piercing penetrator is explained.

A Theoretical Analysis on the Springback of Workpiece during Two-Axle Bending

Yan Jing, Zuo Dunwen, Wang Min

2003, 24(3):  381-384.  doi:10.3969/j.issn.1000-1093.2003.03.022

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Two-axle bending technique is a Kind of advanced manufacturing process for bending tubular parts, especially suitable for difficult-to-work metallic materials with high specific strength, and it can at?tain a fine forming accuracy. The technique has been applied to bend split-sleeve and missile body cylinders successfully. Existing theory on the technique can guide engineering practice to some extent, but there still remain some shortages in it. In this paper, previous work about the theoretical formula oi bending spring- back has been reviewed and summarized，and the difference between the theoretical and the practical results analyzed. On the basis of this using the radius and the feed of the rigid axle which are the main factors of influence on the radius of curvature after springback, a modified bending springback formula has been ob?tained and an example of calculation given. It is shown that the modified theoretical springback results fit well with the experimental results, so the formula given in this paper is of practical use.

Short Notes

An Optimal Knots Spline Measurement Snoothing Method Used in the Optimal Fusion of Multi-Sensor Data

Guo Huidong, Zhang Xinhua

2003, 24(3):  385-388.  doi:10.3969/j.issn.1000-1093.2003.03.023

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When fusing multi-sensor measurements of dissimilar precisions, the weighted mean method was often used. An optimal fusion method was proposed for multi-sensor measurements. Based on the opti?mal fusion of multi-sensors, applied to optimization theory and the least square principle, the movement of objective is described by the B-spline with optimal knots. Thus the approximation process is adaptively fit for the track of moving target with high velocity. Results of calculation show that the optimal knots spline method evidently excels the differential coefficient smoothing method or the isometry knots smoothing method .

Soliton-Like Solution for the (2 +1)-Dimensional Variable Coefficient Kadomtsev-Petviashvili Equation

Chen Fengjuan, Zhang Jiefang

2003, 24(3):  389-391.  doi:10.3969/j.issn.1000-1093.2003.03.024

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Using the truncated expansion method, solution of (2 + I)-dimensional variable coefucient Kadomtsev-Petviashvili equation was discussed. In this method, the formal solution was presented as the power series of some function. Through balancing the highest differential term and nonlinear term, the truncated solution was obtained. This suggested method is simple and easy, and the complicated calculation is transformed into a set of algebraic equations of undetermined functions, leading easily to the integration of ordinary differential equations of undetermined functions. The soliton-nke solution to the (2 + I)- dimen?sional variable coefficient KP equation can thus be constructed.

Experimental Techniques and Analysis

Experimental Study on Penetration against Spaced Targets with Big Spacing of Explosively Formed Penetrator Warhead

1:Xie Wen;2:Long Yuan, Yue Xiaobing ,Fang xiang

2003, 24(3):  392-395.  doi:10.3969/j.issn.1000-1093.2003.03.025

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Steel Ej^P simulants with L/D = 1.5 were launched at impact velocities of 1300m/s or so by a cannon for studying the flight characteristics and penetration ability of EFP. It penetrated thin A3 steel spaced targets at large distances. High-speed photography was used to investigate tlie flight characteristics of the EFPs among targets. The paper also analyzes the process and principle of EFP against multiplayer targets with Dig spacing between each other to a certain extent. The conclusion and its analysis obtained from the experiments indicate that the EFP designed has good stability of flight and penetration against spaced targets and provides important parameters for designing waTheads against armoured targets such as naval ships.

Study of Plasma Enhanced Burning Process in Electrothermal Chemical Launcher

1:Dai Rong;2:Li Baoming

2003, 24(3):  396-398.  doi:10.3969/j.issn.1000-1093.2003.03.026

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The process of solid propellant ignition, single pulse or double pulse plasma enhanced burning in solid propellant electrothermal chemical (SPETC) launcher was accomplished with a loading density of 0.3 ? 0.35g/cm3 and an electric density of 0.58?0.98kJ/g，and the one dimensional SPETC two-phase model was used for the analysis of the enhanced burning effect. Based on experiments, the influence of plasma in?jection occasions to ballistic performance was discussed, and the experiments indicate that plasma injection just after peak pressure can extend the pressure flat roof and improve ballistic performance effectively.

A New Method of Testing for the Radiation Spectrum Performance of Infrared Bait Medicaments

Pu Weihua, Du Zhiming

2003, 24(3):  399-402.  doi:10.3969/j.issn.1000-1093.2003.03.027

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A new test method for the radiation spectrum performance of infrared bait medicament was in?troduced in this paper. This method is also suitable for the pyrotechnics composition that can produce radia- tion in the 0.2?14.5μm waveband with a combustion temperature under 2000*0 . Features of the method and the obtained results were described by a group composition testing. Problems in the design of composi?tion of the infrared bait medicament were also discussed.

Dynamic Analysis of the Elastic-Plastic Fracture of Materials under a Stress Wave Load

Sha Guiying***, Yang Liying***, Jiang Fengchun*, Liu Ruitang*

2003, 24(3):  403-407.  doi:10.3969/j.issn.1000-1093.2003.03.028

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Dynamic Yield Strength of Shock-Loaded Manganin Gauges

Duan Zhuoping, Guan Zhiyong

2003, 24(3):  408-411.  doi:10.3969/j.issn.1000-1093.2003.03.029

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The response of stress gauges emoedded in shock-loaded materials is important in the field of dynamic measurement. Variation of yield strength with shock pressure of iou-like manganin gauges can be determined by analyzing their dynamic calibration curve. The analysis was based on the assumption that the material behaves as an elastoplastic work- hardened solid ana on the general expression for the resistance change of manganin derived by Rosenberg L and Partom Y. In the present paper was given the dynamic yield strength of the foil-like manganin gauge for shock stress in the range of 1. 5 ?9. OuPa by planar shock wave experiments.

Research Notes

System Simulation of Changeable Structure Feed Forward Fuzzy Control for Vehicle Shift

Zhao Dingxuan, Wang Zhuo, Zhang Jingbo

2003, 24(3):  412-415.  doi:10.3969/j.issn.1000-1093.2003.03.030

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Changeable structure feed forward fuzzy control unit was first applied in the control system of a vehicle’s shift course, rhrough the establishment of different control parameter collections for different phases of oil pressure control curve for the shift course, the character state space of the system is changed. This shortens the fuzzy control section, widens the strong scale control section and the keeping control sec?tion in the early period of rinse oil phase and low pressure phase. And it shortens the strong scale control section and the keeping control section, widens the fuzzy control section in the period of mixed pressure phase and high pressure keeping phase to exert fully the function of adjusting the controller for oil pressure, it can thus achieve the aim of improving the shift quality. Moreover, the feed forward unit has the stated prefiguring character, it can shorten the shift time.

Choice of Capacitors Used in Electromagnetic Launcher

Lin Fuchang, Li Jin ,Yao Zonggan

2003, 24(3):  416-418.  doi:10.3969/j.issn.1000-1093.2003.03.031

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The relationship between the density and lifetime of film capacitors, the present day level of capacitor production and the trend of density development in the world were analysed. Dry metallized ca?pacitors are proposed to be used as the energy storage element. According to the request on the lifetime of an electromagnetic launcher, a resonable lifetime target of high energy density capacitors was put forward.

Comparative Study of Penetration Performances of Steel Projectiles Impacting Steel Plates

Wang Lin, Wang Fuchi, Wang Lu,Cai Hongnian, Li Shukui

2003, 24(3):  419-423.  doi:10.3969/j.issn.1000-1093.2003.03.032

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A comparative study investigating different penetration performances and microstructure de?velopment was presented m this paper when hollow projectiles made of 35LrMnSi and bainite steel impacted A3 steel plates. Powder gun was used to carry out normal impact tests at a velocity range of 600 ?800m/s. It was founa that thickening, mass erosion and adiabatic shear bands exist in each projectile. Development and distribution of adiabatic shear bands determine the deformation and erosion of projectiles. There were microvoids and microcracks in ASBs of bainite steel and microcracks in those of 35CrMnSi. Microhardness of ASBs in both steel projectiles were about 30% higher than those of matrix. At the same striking velocities (800m/s)，35LrMnSi and bainite steel projectiles have similar ballistic performances. 35UrMnSi is de?formed or eroded less in comparison with bainite steel, due to its relatively higher strength. Bainite steel can be used as a material for projectiles.

Contactless Synchronous Transmission of Power and Information for Fuzes

Zhou Xiaodong, Zhang He

2003, 24(3):  424-426.  doi:10.3969/j.issn.1000-1093.2003.03.033

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A novel contactless synchronous transmission of power and information for fuzes was intro?duced. The dynamic synchronous transmission of power and information between the fire control system and fuzes can be realized through detachable transformer. The capacitance works as the store of power and the electrical source of fuzes, and a very high power serves as the signal itself. Then the circuits of power and information transmission were described respectively.

High Resolution Imaging on Passive Millimeter Wave Radar

1:Zhang Jianghua, Li Fuli;2:Du Zicheng,Yang Jun

2003, 24(3):  427-429.  doi:10.3969/j.issn.1000-1093.2003.03.034

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The principle of high resolution scan imaging on passive millimeter wave radar was discussed and the relation between point spread function oi image system and passive radar antenna,s radiation pat?tern was set up. The high-resolution algorithm in scan imaging was proposed through deconvolution. The feasibility of this method is demonstrated by computer simulations.

Midcourse Guidance Law Based on Neural Network

1:Wang Jiandong;2:Luo Xishuang, Zhang Tianqiao

2003, 24(3):  430-432.  doi:10.3969/j.issn.1000-1093.2003.03.035

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A kind of midcourse guidance law was studied based on neural network. The midcourse guid?ance law is suitable to be used in comomed guidance in which proportional navigation law is used in the ter?minal guidance. Training samples were provided by designing optimal guidance law which can meet the handover conditions between midcourse guidance and terminal guidance off line. Each weight of NN and threshold of neural cell are optimized through genertic algorithm. The position coordinate of missile and tar?get is used as input of NN, the respective midcourse guidance instruction used as output after computation of NN. The simulation results show that midcourse guidance law based on neural network can be used to at?tack both fixed targets and maneuverable targets and also meet the handover conditions between midcourse guidance and terminal guidance.