基于Visual DSP 环境的Flash在线编程实现

简要介绍了Flash芯片Am29LV320DB,分析了Visual DSP 环境下Flash Programmer编程工具的界面和驱动,详细阐述了Visual DSP 环境下如何对Am29LV320DB进行在线编程,给出了硬件连接的原理图和软件程序的核心代码,对其它Flash芯片的编程有较高的实用和参考价值.     

基于故障注入的雷达装备测试性验证试验方法

为将测试性验证工作充分应用于雷达装备中,分析现有测试性验证工作的流程以及方法;现在的测试性验证工作一般采用三阶段评定法:测试性设计核查、试验验证和使用评价,这些方法都是在相应的阶段进行的,得到本阶段测试性验证的结果;对雷达装备采用故障注入的方法进行测试性验证试验,进行故障检测和数据收集处理得出相应的测试性指标参数,用来评定雷达装备当前的测试性水平是否合格并给出接收或者拒收的结论。     

基于LabVIEW FPGA模块的雷达模拟回波多普勒频移调制

目标回波的多普勒信息反映了目标与雷达之间的相对运动情况,多普勒频移的调制是雷达回波信号模拟的重要内容。利用LabVIEW FPGA模块可以用图形化的编程编译FPGA,给出了一种多普勒频移调制的方法,先利用LabVIEW FPGA模块生成带有多普勒频移的零中频信号,再上变频到需要的频率。实验结果表明,这种方法有效、可行,同时该方法还可以大大缩短系统开发时间。     

Research on spatial-variant property of bistatic ISAR imaging plane of space target

The imaging plane of inverse synthetic aperture radar(ISAR) is the projection plane of the target. When taking an image using the range-Doppler theory, the imaging plane may have a spatial-variant property, which causes the change of scatter’s projection position and results in migration through resolution cells. In this study, we focus on the spatial-variant property of the imaging plane of a three-axis-stabilized space target. The innovative contributions are as follows. 1) The target motion model in orbit is provided based on a two-body model. 2) The instantaneous imaging plane is determined by the method of vector analysis. 3) Three Euler angles are introduced to describe the spatial-variant property of the imaging plane, and the image quality is analyzed. The simulation results confirm the analysis of the spatial-variant property. The research in this study is significant for the selection of the imaging segment, and provides the evidence for the following data processing and compensation algorithm.     

双基地角时变下的逆合成孔径雷达越分辨单元徙动校正算法

采用双基地逆合成孔径雷达距离-多普勒算法成像时,目标尺寸较大或累积转角过大,会引起越分辨单元徙动现象,影响成像质量.针对双基地角时变下逆合成孔径雷达成像的越分辨单元徙动问题,提出了一种校正算法.首先,建立了双基地逆合成孔径雷达回波模型,分析了越分辨单元徙动的产生机理,并通过广义的Keystone变换实现了越距离单元徙动的校正,同时消除了目标非匀速转动对成像的影响.然后,基于图像对比度最大准则估计了图像的等效旋转中心位置,并对距离向绝对定标,进而构造补偿相位项,完成了越多普勒单元徙动的校正.仿真实验结果表明,此方法能够有效地校正双基地角时变下的越分辨单元徙动,提高成像质量.