Table of Content

30 June 2005, Volume 26 Issue 3

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Paper

Optimization Model for Gearbox Ratios Utilizing the Method of Random Directions and Simulation of Acceleration from Standing Start

WANG PU-kai, BI Xiao-ping, LI Hai-jun

2005, 26(3):  289-293.  doi:10.3969/j.issn.1000-1093.2005.03.001

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An optimization model for gearbox ratios using the method of random directions and the simulation of acceleration from standing start were proposed. The model takes the gearbox ratios as the object of optimization and takes the acceleration time and accumulated fuel consumption in a standing start acceleration as the optimiza?tion target. The model of standing start acceleration for vehicle is based on the transient working process of the engine. Through the results of the example optimization for gearbox ratios of an armored tracked vehicle which uses a turbocharged diesel engine and lockup hydrodynamic transmission, it is proved that this model is helpful in designing and improving the power performance and fuel economy of the vehicle.

Study and Application of Graphic Modeling Techniques of Shaft Torsional Vibration Based on System Matrix Method

XIANG Jian-hua, LIAO Ri-dong, ZHANG Wei-zheng

2005, 26(3):  294-298.  doi:10.3969/j.issn.1000-1093.2005.03.002

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A system matrix method, which is used for torsional vibration analysis, is a kind of theoretically per?fect analytic method. A new graphic modeling method based on the system matrix method is introduced by ana?lyzing the variant vibration mathematical models. This modeling method only needs users to supply the original mechanical models, and is not limited in the shaft branched structure and the scale of model. During the detailed realization, the method divides torsional vibration blocks into two kinds oi block units used to create various tor?sional vibration mechanical models. The model’s topological structure is established by transforming the blocks in the model and generating equivalent system. In the end, the system matrix is generated to solve the vibration differential equations. An application example shows that the graphic modeling method is a kind of universal and easily programmed modeling method. The method can be expanded to other model systems, of which mathema?tical models are the same as the vibration differential equation.

Heat Transfer in Gun Barrel Based on Inverse Heat Conduction Problems

WU Bin, XIA Wei

2005, 26(3):  299-302.  doi:10.3969/j.issn.1000-1093.2005.03.003

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Calculation of heat flux into the gun bore is very important for wear problems in the gun barrel and its thermo-mechanical properties. Only convection heat transfer between propellant gas and gun bore is taken into account with the traditional method. In this paper, all types of heat flux into the gun bore are analyzed and cal?culated using the inverse conduction method, and under this boundary condition the temperature field is calculat?ed using finite element analysis, wmch is in agreement with measurements. Radial temperature field under sus?tained firing condition is also analyzed. It is pointed out that employing active cooling technology is a key measures for the control oi initial and maximum temperature of gun bore.

Numerical Simulation on the Inlet Complex Turbulent Flow of Ramjet Assisted Range Projectiles

CHEN Xiong, ZHENG Ya, ZHOU Chang-sheng, JU Yu-tao

2005, 26(3):  303-307.  doi:10.3969/j.issn.1000-1093.2005.03.004

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The numerical simulation of supersonic inlet internal turbulent flow of solid rocket ramjet assisted range projectiles was performed by 2-order implicit TVD? Through an analysis on the numerical simulation re?sults of intersecting wedges supersonic turbulent flow and the comparison between numerical results and experi?mental data, the results show that the algorithm used in this paper and the code formed from it are credible. Above-mentioned algorithm and code can predict complex turbulent flow of shock/shock and shock/boundary layer interaction exactly. Lastly, complex wave structures of supersonic inlet under different outflow pressures were presented Dy numerical simulation. The flow field development progress and the influence of outflow pres?sure on the working performance of inlet were also analyzed. I he theoretical method for later study is provided in the paper.

Support Vector Machine-based Trajectory Recognition with Applications in the Adjustment of Radar Trajectory Prediction

TAO Qing, LIU Xin, TANG Sheng-ping, DING Yong-qing

2005, 26(3):  308-311.  doi:10.3969/j.issn.1000-1093.2005.03.005

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Support vector machine(SVM) is a technique of classification based on the structural risk minimization principle, and a regression method with fine ability of generalization. In this paper, the SVM classification tech?nique is first applied to recognize trajectories. Then the 5VM regression method is employed to model the trajec?tory data. Thus the initial point can be effectively predicted. Simulation experiments demonstrate that the pro?posed algorithms has high precision, and the accuracy of trajectory prediction can be further improved based on trajectory recognition.

The Effect of tiring Rate on the Interior Ballistics Characteristics of Metal Storm Weapon System

HE Lei, HUANG Lei, ZHOU Ke-dong

2005, 26(3):  312-315.  doi:10.3969/j.issn.1000-1093.2005.03.006

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An interior ballistics physical process of weapon systems with the operation principle of Metal Storm was described in light of its characteristics. With an example of firing a kind of bullet, the effect of the variation of iirmg rate upon the interior ballistics characteristics was discussed in detail. The researches indicate that the greater the iirmg rate is, the stronger the coupling phenomenon ot interior ballistics among the adjacent fired bullets is. This coupling phenomenon will further affect the muzzle parameters and shooting accuracy.

Analysis and Implementation for Fuze Productivity Evaluation System

QIN Jie, ZHANG De-zhi

2005, 26(3):  316-319.  doi:10.3969/j.issn.1000-1093.2005.03.007

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On the basis of the founded fuze productivity appraising system, a discussion about how to set up an analysis model of evaluation system was proposed. I hen, based on the mathematics model of the concept of in?dex5 s satisfied degree and considered the consistency about quantitative index and its type, a common degree arithmetic was built, which adopted the non-quantitative treatment method. Finally, the automatic analysis sys?tem of fuze productivity evaluation system and the interface mode of feature cognition were established by the way of object-oriented method.

The Calculation of Combustion Characteristics of B/KNO3

ZHU Ming-shui, LONG Xin-ping, JIANG Xiao-hua, HE Bi, JIANG Ming

2005, 26(3):  320-322.  doi:10.3969/j.issn.1000-1093.2005.03.008

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B/KNO3 is a safe and inert kind of amorce, whose combustion releases high heat and can ignite insen?sitive secondary explosives, and is widely used in direct ignition systems. Theoretically calculating the combus?tion characteristics of B/KNO3 may benefit the design of such systems. In this paper, the VLW EOS and the minimum free energy theory were used to calculate the combustion characteristics of B/KNO3. Before calculation, JANAF thermochemical table was fitted to determine the thermodynamic function coefncients of boron oxide by method of the least square. The impetus, covolume and maximum constant volume pressure of 0.31 g/cm3 B/KNO3 were got by the calculation, which are 2? 145 X 1O5 J/kg, 4.47 X IO4 m3/kg and 78? 23 MPa, respectively. These results are close to the closed bomb test values 2.116 X IO5 J/kg, 4.418 X IO-4 m3/kg and 76 MPa individually.

Estimation of Direction of Arrival and Doppler Frequency with Array Error

TAO Jian-wu, SHI Yaowu，CHANG Wen-xiu

2005, 26(3):  323-326.  doi:10.3969/j.issn.1000-1093.2005.03.009

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When there exists general array error in uniform linear array (ULA)，an estimation of the direction of arrival (DOA) and Doppler frequency for signals was proposed. The array error model of ULA was set up. De?tailed analysis of ambiguous problem was presented. Unambiguous DOA and unambiguous Doppler frequencies for signals were calculated by total least squares (TLS) and maximum likelihood (ML) . Simulated results show that the algorithm is valid and robust.

Effects of Atmospheric Turbulence on the Laser Alignment of a Shaft

CAO Guo-hua, XU Hong-ji, SU Cheng-zhi

2005, 26(3):  327-329.  doi:10.3969/j.issn.1000-1093.2005.03.010

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Effects of atmosphere turbulence upon the measurement of shaft alignment were analysed in the shaft center-line alignment measurement with visual laser technology and position sensitive detector (PSD) technology. A calibration method was presented, in which the wander of laser directrix is monitored in real time by monitor?ing light target and the error compensation is realized by line correction.

Design of Wideband Frequency Seeking Method of a Pulse Doppler Radar Simulator in a Missile

LU Jin-hui

2005, 26(3):  330-334.  doi:10.3969/j.issn.1000-1093.2005.03.011

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The pulse Doppler radar simulator discussed is used to provide radar echo signals and checkout the per?formance of radar in an open conaition. The design of the simulator makes use of the techniques of twice fre?quency conversion and carrier extraction based on locked phase loop and single sideband modulation. It can auto?matically and quickly lock the radar running frequency in a wide range, and resend the simulated echo signals. The design and implementation of frequency seeking from the system principle and program design were dis?cussed chiefly in the paper. The test shows that the method is feasible in engineering.

The Measuration to the Defection on the Turbine-vane of the Aeroengine Based on the Digital Radiography

KONG Fan-qin, LU Hong-nian

2005, 26(3):  335-337.  doi:10.3969/j.issn.1000-1093.2005.03.012

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In the on-line testing, measuring the defection automatically is a key-technology. In order to solve this problem about the turDine-vane, the texture of the digital radiography(DR) image was analysed. The image is divided into four regions by means of several intersected points. According to the pixel value in each region, the function expressed tne value-distribution is defined and used to decrease the texture in the image. For the pixel value processed and approximating a normal distribution, a threshold is set to get the defection informa?tion. Setting function and array are used to describe the defection correctly in the size and the shape at last.

Method of Implementation of Fusing Correlated Attribute Information in Target Recognition

WANG Yong-cheng，WANG Hong-fei，YANG Cheng-wu

2005, 26(3):  338-342.  doi:10.3969/j.issn.1000-1093.2005.03.013

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Target recognition is an important branch of application in multi-source information fusion. The at?tribute informations measured by each sensor are often correlated and dependent and therefore it is frequently a hard task to fuse data from different sensors. A novel weighted combination method based on the MADM and D- S evidence theory was put forward and the methods of establishing weight coefficients and analyzing their sensi?tivity were given in this paper. Moreover, the weighted conditional probability is also introduced into target recognition.

MTF Measurement of ICCD Imaging Systems

LI Sheng-cai, JIN Wei-qi, XU Zheng-guang, ZHANG Jian-yong

2005, 26(3):  343-347.  doi:10.3969/j.issn.1000-1093.2005.03.014

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Further applications of ICCD imaging system attract more attention to its imaging quality evaluation and methods of measurement. Based on the extended definition of local isoplanatism of discrete imaging system, a method of discrete sampling digital Fourier transform was introduced in this paper. With the help of the above measurement, the measurement of modulation transform function (MTF) of ICCD imaging systems was accom?plished .A set of comparability experiments using test charts of reflection for television radiation stripe tests was also given. The experimental results indicate that the method and the results of measurement are reliable.

Research on Interference to Target Detection of IR Imaging by Smoke

ZHOU Zun-ning, PAN Gong-pei, GUAN Hua,Zhu Chen-guang

2005, 26(3):  348-352.  doi:10.3969/j.issn.1000-1093.2005.03.015

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The detecting and guidance technology of IR thermal imaging occupies an important position in mod?ern war. The interference mechanism of cold smoke and heat smoke for IR thermal imaging set was studied through the detecting mechanism of IR thermal imaging set for target and the interference mechanism of smoke for IR thermal imaging. The smoke performance was studied in smoke chamber. The detecting ability of IR thermal imaging is decreased with the smoke mass concentration increasing. The interference mechanism of cold smoke for IR thermal imaging set is absorption and scattering of smoke particles. But heat smoke can screen IR thermal imaging set depending on stronger IR radiation than targets beside absorption and scattering. The ex?periment results are consistent with theoretic results.

Design and Optimization of Wavy !Trajectory for Ballistic Missiles

GU Liang-xian，GONG Chun-Iin, WU Wu-hua

2005, 26(3):  353-356.  doi:10.3969/j.issn.1000-1093.2005.03.016

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That the anti-defence technologies has become less developed compared with defence technologies be?comes today one of the most acute problems faced by ballistic missiles. So, to develop anti-defence technologies is today an important means to improve the ability of survival of ballistic missiles. Aimed to retard the response of a ballistic missile defence system, wavy trajectory with three crests was designed in this article to replace the tra?ditional parabola trajectory. Wavy trajectory of missiles can embarrass the defence system in detecting and com?puting the track and destination before reentry. So, wavy trajectory may greatly improve the ability of a anti-de?fence of ballistic missiles. In this article, based on a certain land-land ballistic missile, a new kind of ballistic mis?sile was designed with an additional rocket engine, which can be ignited twice. Finally, the trajectory profile was optimized with complex algorithm to maximize tne average amplitude of three wavy.

Modal Solution to Large Deformation of a Steel-pipe Assembly Under Explosive Loading

GU Hong-jun, ZHAO Guo-zhi，YIN Ke-gong

2005, 26(3):  357-361.  doi:10.3969/j.issn.1000-1093.2005.03.017

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Large deformation in the energy-absorbing unit of a multi-row steel pipe structure under explosive loading is of great significance to the design of an explosion-resistant energy-absorbing unit. From experiments, the plastic behavior of the steel pipe assembly was analyzed when radial explosive loading is exerted. Based on the principle of virtual velocity, the modal solution to the eight-plastic-hinge pattern was established, and the displacement speed field of steel pipes under radial explosive loading was described and verified in experiments.

Hybrid Vibration Isolation in Electromagnetic Vibration Feeders

ZHANG Chun-liang, MEI De-qing，CHEN Zi-chen

2005, 26(3):  362-366.  doi:10.3969/j.issn.1000-1093.2005.03.018

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Passive vibration isolation and hybrid vibration isolation of electromagnetic vibration feeders were studied. Adopting passive vibration isolation, transmissibility of vibration from electromagnetic vibration feeders and the effect on other equipments can be effectively reduced, but its working efficiency is reduced too. By choosing appropriate feedback variables and feedback gains, the vioration transmissibility and efficiency of elec?tromagnetic vibration feeders can be markedly improved by a hybrid vibration isolation system. When the accel?eration of the upper mass is used as the feedback variaole and the acceleration feedback gain is equal to the mag?nitude of the upper mass, the electromagnetic vibration feeder has then the best work efficiency and the vibration transmissibility approaches zero.

H∞ Control for Singularly Perturbed Systems Using Matrix Inequality Approach

CAI Chen-xiao, ZOU Yun

2005, 26(3):  367-371.  doi:10.3969/j.issn.1000-1093.2005.03.019

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H∞ control problem of singularly perturbed systems via a bilinear matrix inequality approach was dis?cussed in this paper. The sufficient and necessary condition for the H00 control problem of singularly perturbed systems was derived by using boundary real lemma of singular systems. At the same time, the Riccati inequali?ty, which includes the small-perturbed parameter, was transformed to equivalent inequalities without small-per?turbed parameter. The proposed results can be applied not only to standard case, but also to nonstandard H∞ control for it is needless to decompose the system into fast-slow subsystems. The results of a simulated example show that the method is effective and simple.

Improving Random Point Scalar Multiplication Through Computing Directly 2kP on GF(2m)

ZHANG Ru, LIU Ming-ye

2005, 26(3):  372-374.  doi:10.3969/j.issn.1000-1093.2005.03.020

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Random point scalar multiplication on binary field GF(2m) is one of the costliest computations in el?liptic curve cryptography. According to the formulas to compute directly 4p，8p，16p and 32p，formulas to compute directly 2kP were deduced. And combining them with the existing -width signed window method, the method of directly computing the 2kP signed windows was given in this paper. This improved method keeps the features of ω-width signed window method, decreases the number of doubling, and ultimately improves the speed of scalar multiplication. When tested on a 200 MHz DSP, it is proved that the new method greatly speeds up scalar multiplication, and when compared with the method put forward by Yasuyuki ^akai etc, the speed of the arithmetic is increased about 20 % .

The Metal Magnetic Memory Phenomenon of High-strength Steel in the Process of Grinding

ZHANG Wei-min，A A Doubov, SUN Hai-tao, LIU Hong-guang

2005, 26(3):  375-378.  doi:10.3969/j.issn.1000-1093.2005.03.021

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The phenomenon of metal magnetic memory (MMM) of high-strength steel such as gun steel and pro?jectile steel in the process of grinding was discussed m this paper. Experimental data show the remarkaole change of magnetic field intensity in the specimen’s surface. But the change is non-linear, and further study is needed. Comparing the test results of MMM with the stress change tested by means of X-ray diffraction, certain rules have been found from the contrast of the two. These phenomena are explained from the point of view of materi?als science, and the model of the relation between the tested magnetic field intensity and stress-gradient of cylin?drical parts has been set up in the view of the magneto-elastic theory.

Wavelet Neural Network-based Reconstruction of Gun’s Flaw Profiles

WANG Chang-long, XU Zhang-sui, FU Jun-mei,CHEN Peng

2005, 26(3):  379-382.  doi:10.3969/j.issn.1000-1093.2005.03.022

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The principle and the mathematical model for magnetic flux leakage (MFL) nondestructive inspection were introduced, the use of wavelet neural networks (WNN) for the reconstruction of flaw profiles was present?ed in this paper. In the simulation experiment, WNN is first trained to approximate the flaw profiles using the trained samples from both the mathematical model data and the measured gun’s MFL signals. A stochastic gra?dient descent algorithm was adopted in the training procedure. rhe trained WNN was then employed to predict the flaw shape from the measured MFL signals, while WNN is a multi-resolution approximation. The accuracy of estimated flaw profiles is controlled by adapting the number of resolution. The result indicates that the WNN approach can accurately reconstruct flaw profiles.

Fractal dimensions of Fracture Cracks on Tank Track Materials and Their Variation with Crack Extension

XU Lian-yun， TIAN Xin-li, HOU Zhen-de

2005, 26(3):  383-386.  doi:10.3969/j.issn.1000-1093.2005.03.023

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ZGMnl3 is a kind of material extensively used in tank tracks, so an investigation of its fracture prop?erty is of significance for improving tank performance. Digital images on specific positions of fatigue crack in specimens are taken by scanning electron microscope (SEM). Crack pronles are obtained by an image processing technique. The fractal dimensions of each crack profile are measured by fracture profile method(FPM) . It is found that the fractal dimensions vary with crack extension, and the maximum fractal dimension is in the middle area of each fatigue crack.

False Alarm Filter of Mechatronics Built-in Test Based on the Hidden Markov Model

LIU Xin-min, WEN Xi-sen, QIU Jing,LIU Guan-jun

2005, 26(3):  387-391.  doi:10.3969/j.issn.1000-1093.2005.03.024

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In order to diagnose intermittent fault of systems, after analyzing and modeling BIT systems, a con?tinuous hidden Markov model (HMM) was used to diagnose. Two 3-state diagnostic methods based on HMM were applied to two different conditions with or without intermittent fault training samples. The results show that both methods can diagnose intermittent faults efficiently and BIT false alarms are reduced.

Genetic Algorithm Based Multi-character Inspection Path Planning in Coordinate Measuring Machines

JI Xiao-gang, GONG Guang-rong

2005, 26(3):  392-396.  doi:10.3969/j.issn.1000-1093.2005.03.025

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Application of genetic algorithm in measuring complicated parts with coordinate measuring machines was discussed. Some new methods on the establishment of relationship matrices and the search of valid paths were put forward. Operations of initialization, selection, crossover and mutation in GA were expatiated in de?tails. A case finally was studied demonstrating its effectiveness in inspection path planning.

Wearing Mechanism of Tools in the Orthogonal Turn-milling of High Strength Steel

JIN Cheng-zhe, JIA Chun-de, PANG Si-qin

2005, 26(3):  397-400.  doi:10.3969/j.issn.1000-1093.2005.03.026

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The authors finished a series of orthogonal turn-milling tool wear experiments on a rebuilt profile mod?eling machine. The wearing configuration of machining 58SiMn steel in turn-milling is rake face wears, flank face wears and minor flank face wears. Configuration of wear and mechanism of orthogonal turn-milling tool in orthogonal turn-milling high strength steel were studied. Compared to normal turning and milling, minor flank face wears are even more severe. Additionally, as the minor flank face wears influence on the machined surface quality, its quantity is defined as the standard of tool life in turn-milling. Mechanism of tool wearing in turn- milling is fatigue-exfoliative wearing, felted wearing in lower cutting speed, and diffuse wearing in higher cut?ting speed, accompanied with abrasive wearing. Under different cutting conditions the mechanism of turn- milling tool is different, the degree that cutting speea influences on the turn-milling tool wearing is the greatest. Fatigue-exfoliative wearing, felted wearing and abrasive wearing go along almost all the time, while diffuse wearing enters on the leading only when the cutting speed reaches a definite value.

Short Papers

A Study on the Runaway Escapement Dynamics

LU Wen-guang, RUI Xiao-ting, LU Yu-qi, GU Jin-Iiang

2005, 26(3):  401-404.  doi:10.3969/j.issn.1000-1093.2005.03.027

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In order to overcome the limitation of a traditional model, a ‘free-contact’ dynamic model of runaway escapement and the dynamic equations which have the same form during the ‘ free ’ state and the ‘ contact ’ state were established in tnis paper. With the help of the Crossley equation, contact between the pallet and escape wheel was precisely described. A simulation on the clock mechanism of M739 was made. The results rfeveal the phenomenon oi the second impact’ known experimentally. An effective digital simulation method was provided for the dynamic design and failure analysis of runaway escapement.

A Simulant Method of Measuring Propellant Temperature of Rockets

CHEN Gui-dong, ZHOU Yan-huang

2005, 26(3):  405-408.  doi:10.3969/j.issn.1000-1093.2005.03.028

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The necessity and possibility of measuring the propellant temperature of rockets accurately were intro?duced briefly. According to the transfer characteristic of rockets, seventeen parameters were used to describe the transfer of rockets including twelve nondimensional parameters and five basic parameters. The nondimensional parameters are analyzed and classified. A 1/5 size model was discussed in tnis paper, which keeps the same tem?perature as the rocket’s at the same time. The rocket and the small size model having the initial temperature (20 0C ) are both placed under the same environment keeping 48 °C . The experiment lasts for as long as I 280 min and the difference between the characteristic temperature of rocket and the model’s is not more then I 0C . The experimental result shows that the design meets the demand of engineering.

Experimental Techniques and Analysis

Virtual Test Techniques of Fuze Arming Distance

TAN Hui-min，NEU Lan-jie, LlU Ming-jie, FANG Wei

2005, 26(3):  409-412.  doi:10.3969/j.issn.1000-1093.2005.03.029

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Virtual test of the fuze arming distance of air-to-air missile was studied by Monte Carlo simulation in order to reduce or partly replace shooting tests of ammunitions. Mathematical means introduced in the paper, such as the noise model in the movement, the spread model of parts size of fuze and dynamics parameter of fuze machinery, etc. are effective also for other machineries in a fuze. The embedded software that can form the ge?ometry model randomly was designed based on the existing engineering software in the national lab of mecha- tronics engineering and control. The distribution characteristics of 100 results of virtual tests accord well with the fire test of homogeneous devices.

Research Notes

Comprehensive Evaluation of Power-train Performance for Tracked Vehicles

LUO Qing-guo, ZHANG Yong-feng, Yuan Wei

2005, 26(3):  413-417.  doi:10.3969/j.issn.1000-1093.2005.03.030

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Based on an all emDracive evaluation of the power-train performance of tracked vehicles, power-train performance of tracked vehicles is evaluated comprehensively using the method of weighted comprehensive evalu?ation .Weighted comprehensive evaluation is an effective and widely applicable method. The example cited in the paper proves that the method compares intuitively the advantages and disadvantages in the evaluation of the pow-er-train performance of different tracked vehicles, with the results obtained valid and dependaole.

Study on Principle Demonstration and Fighting Simulation of Jamming Anti-ship Missile by Chaff Screen

GAO Dong-hua, TIAN Wan-qing, XU Qing-feng

2005, 26(3):  418-422.  doi:10.3969/j.issn.1000-1093.2005.03.031

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A new method for jamming anti-ship missile was presented based on the screening effect and the jam?ming principle. The feasibility of chaff screen for jamming anti-ship missile and the tactical technical specifica?tions of successful jamming were demonstrated. The dispensing decision of chaff screen jamming and the mobile avoidance decision approaches of ships are dynamically optimized during simulation.

An Infrared Imaging Fuse Optical System

LUO Lai-bang, CHANG Ben-kang, DONG Xin-qing

2005, 26(3):  423-425.  doi:10.3969/j.issn.1000-1093.2005.03.032

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The design of a dual-color infrared optical system for use on smart ammunitions was introduced. The selections of optical system parameters and optical system structure were given, together with the aimed objec?tives of the dual-color infrared optical system. Characteristics of the optical system were tested. Many unique means were adopted to meet the specific requirements in missile-borne systems. The optical system has the ad?vantages of simplicity, compactness, small off-axis aberrations and evenness of illumination on the image plane. An overloading of 180 00 g has been tested on a simulation air artillery. Measurement results prove that the de?vice can reach the requirements of mounting on smart ammunitions, and it has been testified as prototypes.

Several Issues in Installation of 2-axis Rate Gyro Stabilized Sighting System

LUO Hu, FAN Da-peng, ZHANG Zhi-yong, et al

2005, 26(3):  426-428.  doi:10.3969/j.issn.1000-1093.2005.03.033

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2-axis gyro stabilization is widely applied to the mobile operational platforms to stabilize collimator, artillery, radar and antenna, etc. The angular velocity compensations of carrier attitude measurement are differ?ent if the installation modes of gyros are different. Based on the principle of the stabilized theory and gyro atti?tude measurement theory, a mathematic model was established. According to a mathematic expression, three in?stallation modes were summarized. In the end, an application example was introduced.

Estimation of Doppler Parameter of Spaceborne Synthetic Aperture Radar by Matched Fourier Transform

ZHU Li, WANG Sheng-Ii, NI Jin-Iin, et al

2005, 26(3):  429-432.  doi:10.3969/j.issn.1000-1093.2005.03.034

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A basic signal model of spaceborne SAR was discussed. According to the model, a new method of Doppler parameter estimation for SAR was proposed. At the same time, theoretical analyses and simulation re?sults were given. In addition, the estimation Doppler parameter was made with the spaceborne SAR experimen?tal echo data. The imaging results of SAR were finally obtained from the estimated Doppler parameter. Simulat?ed results and the images prove that the method can execute bimd processing for SAR data and can efficiently es?timate Doppler parameters, and show that high precision of estimation is obtained.