数传接收机自动检测设备的设计

介绍了某型数传接收机自动检测设备的设计，该检测设备采用硬件平台、软件平台的模式，具有自动化程度高、通用性和扩展性强等优点，重点介绍了专用测试资源双脉冲信号源的设计和设备故障诊断方法。应用该设备可以完成对数传接收机的出厂调试和修理厂定检维修等功能。     

以分配函数的概念认识冲激信号δ（t）及复合函数研δ[f（t）]

指出了狄拉克对单位冲激信号δ（t）定义的不严格性，从分配函数的角度给出了δ（t）的严格定义，并证明了δ（t）的尺度特性及其复合函数δ[f（t）]的性质，列举了3个错误应用δ[f（t）]性质的例子，指出了错误的实质，并给出了正确的解答过程。     

工业微机控制系统小信号采集的抗干扰措施

本文简述了工业微机控制系统小信号采集过程中常见的干扰来源，并介绍了一种简便，有效的抗干扰措施。     

ANALYSIS OF THE RETURNED SIGNAL MODEL IN BISTATIC RADAR SYSTEMS

ＡＮＡＬＹＳＩＳＯＦＴＨＥＲＥＴＵＲＮＥＤＳＩＧＮＡＬＭＯＤＥＬＩＮＢＩＳＴＡＴＩＣＲＡＤＡＲＳＹＳＴＥＭＳＹｉｎＣｈｅｎｇｙｏｕ，ＸｕＳｈａｎｊｉａ，ＷａｎｇＤｏｎｇｊｉｎ，ＺｈｏｕＬｉｎｙｕｎ（ＤｅｐａｒｔｍｅｎｔｏｆＥｌｅｃｔｒｏｎｉｃＥｎｇｉ...     

直流电压比率信号变换ARINC429数据信号的方案研究

研制适配器是实现机载设备之间信号交联的一种有效途径。在某大型系统中需要将直流电压比率信号变换为ARINC429数据信号,本文在简单分析输入输出信号特性的基础上,对信号变换的组成模块以及各功能模块的实现方案进行了论述。     

基于DSP的导引控制器硬件设计与实现

按照小型化、高实时性的要求,采用TI公司面向控制的DSP芯片TMS320LF2407A,设计并实现了以DSP为处理核心的导引控制器,详细介绍了系统的整体方案设计和具体的硬件选型及接口设计。重点论述了飞控计算机与导引控制器之间的串行通信设计,并给出了硬件接口电路。     

激光冲击中应力状态和显微组织变化对金属疲劳性能影响

从应力状态与显微组织的变化两个方面分析了激光冲击强化改善金属疲劳性能的机理.首先研究了残余应力的作用,认为激光冲击强化产生的残余压应力降低了零部件承受的平均应力水平.然后利用位错理论分析了金属经激光冲击强化引起的显微组织变化,认为激光冲击强化在材料表层产生了大量位错、晶界以及亚晶界等缺陷,这些缺陷阻碍了位错的移动,使金属得到强化.     

基于DSP的全数字闭环光纤陀螺

介绍了一种采用DSP(Digital Signal Processor)技术实现的全数字闭环光纤陀螺.该闭环光纤陀螺采用以多功能集成光学器件为核心的全保偏结构,以方波为偏置调制,数字阶梯波反馈.文中对该闭环光纤陀螺的前置放大、信号检测、数字解调、数字滤波等部分进行了设计和实现,对采用DSP技术解决系统精度和实时性矛盾的方案进行了讨论,并对闭环光纤陀螺的性能和参数进行了理论分析和实验测试.测试结果表明系统达到了小于0.3/h的零漂和100×10^－6的非线性度指标.     

NOVEL RADAR SIGNAL SORTING METHOD BASED ON GEOMETRIC COVERING

With the increase of complexity of electromagnetic environment and continuous appearance of advanced system radars, signals received by radar reconnaissance receivers become even more intensive and complex. There- fore, traditional radar sorting methods based on neural network algorithms and support vector machine （SVM） cannot process them effectively. Aiming at solving this problem, a novel radar signal sorting method based on the cloud model theory and the geometric covering algorithm is proposed. By applying the geometric covering algo- rithm to divide input signals into different covering domains based on their distribution characteristics, the method can overcome a typical problem that it is easy for traditional sorting algorithms to fall into the local extrema due to the use of complex nonlinear equation to describe input signals. The method uses the cloud model to describe the membership degree between signals to be sorted and their covering domains, thus it avoids the disadvantage that traditional sorting methods based on hard clustering cannot deinterleave the signal samples with overlapped param- eters. Experimental results show that the presented method can effectively sort advanced system radar signals with overlapped parameters in complex electromagnetic environment.     

Solar Variation and Stratospheric Response

We have shown in several recent publications that it is necessary to group the meteorological data according to the phase of the Quasi-Biennial Oscillation (QBO) throughout the year, in order to find a clear signal of the 11-year sunspot cycle (SSC). This work is summarized here. It is the purpose of this paper (1) to update earlier results of the solar cycle – QBO relationship for the northern winter, (2) to stress the interaction between the hemispheres and (3) to summarize the influence of the QBO on the solar variability signal, as well as the influence of the solar variability signal on the QBO throughout the year. For this, the constructed annual mean of the solar cycle – QBO relationship is introduced.