Abstract:The Scheme of the principle for CDMA spread spectrum communication systems based on a class of new chaotic mappings is proposed, which can produce chaotic binary sequences to meet the requirement of spread spectrum codes.The experiment agree with the theoretical prediction well, and the computer simulation of the multi user communication is implemented successfully. Moreover, this scheme can overcome some drawbacks of some other proposed ones for chaotic spread spectrum communicatins.

Abstract:对三轴稳定静止气象卫星成像仪二维驱动下的摆动平面镜、摆动４５°镜两种扫描形式的成像特点进行比较分析，给出了不同扫描模式下的光轴扫描轨迹和像旋转计算公式，以及机械扫描与光学扫描角度关系

Abstract:The apparent spectral emission of a semi transparent medium layer with a sine shaped surface was analyzed by the pseudo source adding method. The isotropic and isothermal medium layer was investigated by considering a specular and semi transparent sine shaped surface as well as a diffuse and opaque substrate wall. The pseudosource adding method was improved. The apparent hemispherical and directional spectral emissivity results were presented and discussed by considering the influences of relevant factors. The pseudo source adding method was found to be very effective for the analysis of the thermal emission of the semi transparent medium layer with curved surface.

Abstract:The application of wavelet transform to the 1 D target imaging of the step frequency MMW high definition radar was studied. The algorithm based on multirange cells was proposed using modulated Gaussian wavelet transform and good guality 1 D images of the radar target were obtained. The results indicate that the method is valuable for the improvement of target classification.

Abstract:利用分形构形的基本理论，对雷达目标散射回波信号进行分形压缩逼近，通过分析压缩，对原始散射信号波形数据进行压缩，从而有利于目标识别．有此基础上，利用散射回波信号的分形压缩特征进行了目标识别研究．实验仿真结果证实本文方法行之有效

Abstract:The difference in the design of the electron gun for MM and CM wave TWT S was analyzed. A new designing method was presented.

Abstract:By using probabilitg theory, a construction model of different types of trees as well as a forest was proposed. According to the energy exchange between environment and the trees or forest, an algorithm was developed for temperature distributions and infrared feature of the trees or forest. Some examples and discussions were given.

Abstract:A new procedure for detecting weak and small infrared targets in the background clutter was presented. Based on the spatial correlation property of the infrared radiation of the background, the spatial distribution of the infrared radiation of the background clutter was predicted by the approach of LMS adaptive spatial predicting filtering, and the moving infrared targets were detected by the predicting error. The method to improve the predicted quality was also discussed. Finally, some experimental results for practical infrared images were presented to show the effect of the procedure.

Abstract:By using the TVS 2000ST thermal video system,the thermal field structure variations of the diffusion flames were observed and measured before and after interaction with the water mist, and the interactions of the water mist with the flame of kerosene, ethanol and heptane were studied in the experiments, respectively, providing a simple and reliable experiment method for cognizance of the interaction mechanism of the water mist with the flame.

Abstract:The temperature and magnetic field dependent resistivity was measured for Hg 1 x Cd x Te photoconductive detectors. The density of all kinds of surface electrons was found to keep constant from 1.2K to 55K by the Shubnikov de Haas (SdH) measurements. A three band model, which consists of two kinds of surface electrons and bulk electrons, was proposed to fit the temperature dependent resistivity. The electrical parameters obtained by this model agree well with the experimental data and the results given by SdH measurements.

Abstract:介绍了一种由鳍线、耿氏器件和梁式引线变容管构成的混合集成电调振荡器电路及其设计方法．给出的ＶＣＯ电路结构简单，利用其等效电路模型，可方便地对振荡器在所需工作频率上的电调带宽进行优化设计．经优化设计的电调振荡器性能的测试结果为：在３４．９３ＧＨｚ的频率处，具有１．２ＧＨｚ的电调带宽，带内功率输出为２０．６５±０．５２ｄＢｍ．

Abstract:Microstructures of single layer of telluride and telluride/ZnS multilayer on Si and Ge substrates were investigated by XRD and TEM. The correlation between adhesion and microstructure of layers was given.

Abstract:The temporal spatial frequency dependent optical transfer function (OTF), MTF and phase transfer function ( PTF ) of SPR on ITE detectors were described based on the impulse response (Green function) of the detectors, and the temporal spatial filtering performance of SPRITE detectors was analyzed in terms of OTF, MTF and PTF .