CPLD在多路通道A/D转换数据采集中的应用

对复杂可编程逻辑器件(CPLD)进行了简单介绍,并通过使用CPLD实现多路通道A/D转换数据的自动采集的例子说明了此种芯片的使用方法。     

基于ICS-554的软件无线电载波同步

在DSP中实现基于ICS-554的软件无线电载波同步,采用相关叉积鉴频器及软件锁相环SPLL进行鉴频.该锁相环由计算频率误差、更新环路中间变量、输出控制信号组成.利用两个A/D采样通道,使原始信号同时进入ICS-554输入.在通道2的A/D模块前加延迟滤波器.相关符号经过混频器、总线传输、软件锁相环计算及频偏控制字总线传输时间.由此通道1中的频偏在通道2中便具有实时效应.     

激光测速靶弹丸过靶信号的存储测试技术

对弹丸过靶信号波形数据的存储测试系统进行了分析,根据实际条件和要求,论述了一种利用复杂可编程逻辑器件CPLD和单片机AT89C51来实现高速数据采集的方法。该系统选用8位A/D转换器,由单片机和CPLD组成的控制器对数据进行存储测试。介绍了系统的组成以及CPLD与单片机控制模块完成的功能和设计思路,并给出时序仿真图。     

基于PC104总线的加速度计数据采集系统设计与实现

加速度计是捷联惯导系统的核心部件,由于捷联惯导系统恶劣的工作环境,通常以I/F转换或A/D采样方案设计的加速度计数据采集系统在测试中均有局限性,因此基于PCI04总线提出I/F和A/D相结合的方法,设计了高精度加速度计数据采集系统,该系统同时具有I/F和A/D方案的优点.从参数标定中可以看出,无论是精度、实时性、可靠性,还是动态测试范围都得到了极大的改善,其中测量精度远高于10-5g.     

基于PCI04总线的加速度计数据采集系统设计与实现

加速度计是捷联惯导系统的核心部件,由于捷联惯导系统恶劣的工作环境,通常以I/F转换或A/D采样方案设计的加速度计数据采集系统在测试中均有局限性,因此基于PCI04总线提出I/F和A/D相结合的方法,设计了高精度加速度计数据采集系统,该系统同时具有I/F和A/D方案的优点.从参数标定中可以看出,无论是精度、实时性、可靠性,还是动态测试范围都得到了极大的改善,其中测量精度远高于10-5g.     

基于新型浮点DSP的AUV导航计算机系统设计

为使自主水下航行器（AUV）导航计算机成本、功耗和体积达到最低,设计了一种基于TI公司新型数字信号处理器（DSP）——TMS320F28335的小型导航计算机,取代以往基于双处理器结构的同类系统,其浮点运算能力可满足导航计算要求,同时采用片内的6路A/D转换器,3路异步串口,2路控制器局域网（CAN）总线等资源完成数据采集和通信功能,外扩一片非易失性NAND FLASH实现大容量数据存储,高速数据交换通道可用于扩展高性能DSP阵列。仿真结果表明,在规定的周期内,系统可完成数据采集、接口通信、导航解算、数据存储等任务。该设计用单片处理器和最少的外围芯片数量实现了高性能的导航计算机系统。     

基于双TMS320F28xx SPI的数据采集和处理

双TMS320F28xx系统,一片用于数字滤波,另片用于复杂控制,通过串行外设接口的FIFO模式,以查询和中断方式实现通信.其数据采集,每路模拟信号独立使用一个A/D转换芯片,选用XZCS6AND7通过逻辑电路同时启动若干路A/D转换,并锁存读取各路转换数据.数据处理采用防脉冲干扰值滤波法(排序周期为4)和中位值滤波法(排序周期为5).     

涡轮增压柴油机瞬态过程参数的采样和分析

本文给出了以IBM-PC为中心的涡轮增压柴油机瞬态过程数据采集分析的硬件和软件系统,它具有数据量大,采样通道多,处理简捷和便于存贮的优点。自制的16路12位A/D转换接口板配以完善的采样和后续处理,程序使瞬变参数的采集分析具有良好的实时性和准确性。对传感器、二次仪表的自动标定和一次～六次曲线拟合的工作程序使线性度很差的测试仪器也能从事精确的测量。     

多路高速数据采集系统设计与实现

介绍了一种多路高速实时数据采集系统的设计方案及实现，该系统是一种单路可独立工作、几路组合可实现多路采集的多路百兆高速实时数据采集系统。每个通道的最大采样率为100Msps，最大数据存储容量约为256MByte。其中采用CPLD和DSP组配实现逻辑控制和数据控制，采用CPLD、DSP和SDRAM组配实现海量存储，采用DSP、FIFO和USB、USB—HUB组配实现数据传输，CPLD和DSP复用，还可实现各种复杂功能。它具有扩展灵活，存储量大，实时性强，精度高，传输方便等特点。可作为各种雷达、导引头等外场试验的通用数据采集系统。     

差动位移传感器自动检定系统

差动位移传感器自动检定系统由激光干涉仪、计算机、动态数据采集接口卡、电机驱动接口卡及配套软件等组成.程序控制步进电机速度与启停,按采样脉冲或程序从电箱读取干涉仪测量值.再放大传感器输出的电压信号、采样保持并A/D转换.由程序或手动控制动态数据采集卡输出采样脉冲,同时输入干涉仪电箱和传感器A/D卡,锁存适时读数,从而实现光电在线自动检定.     

Open Rule-setting System Applied to Conceptual Design of Engines

Open rule-setting method advanced in this paper concentrates on providing designers of engines with a convenient way to express their design innovations and develop the expected prototypes in the early CAD stage, and constitute effective models for the following analysis process of CAE and CAPP. The problems arisen in the process of conceptual design with the traditional experience-based development method are analyzed. Based on those analyses, open rule-setting method is presented and some associated technical problems are discussed. The functional framework of open rule-setting system was built as software engineering methods. The speciality of the engine product as a kind of complex product and the requirement of the engine product based on its structural particularity to rule-setting system are considered carefully. A demonstration is supplied to illustrate how the open rule-setting method enhances the efficiency and quality of the engine conceptual design.     

Research on Linux Network Device Driver

By analyzing the working principle of Linux network device driver, discussing the Linux network driver structure and its key technologies, the general network driver structure and its design methodologies in Linux system are summarized. Through modifying the network device driver of Linux device driver 3rd version snull, c and improving the COW technology, the Zero-Copy technology in Linux （kernel version 2.6.11 ） is implemented. In the end, the success test tells us that the thorough analysis of network device driver is the foundation of many applications, and it also provides a certain improvement to a lot of real applications, even to military application development.     

Algorithm for Multi-laser-target Tracking Based on Clustering Fusion

Multi-laser-target tracking is an important subject in the field of signal processing of laser warners. A clustering method is applied to the measurement of laser warner, and the space-time fusion for measurements in the same cluster is accomplished. Real-time tracking of multi-laser-target and real-time picking of multi-laser-signal are introduced using data fusion of the measurements. A prototype device of the algorithm is built up. The results of experiments show that the algorithm is very effective.     

Influence of Installing Error on the Surface Shape Precision of the Axial Symmetry Aspheric Workpiece in Lapping

A method to calculate the surface shape error, which is caused by the installing error between the workpiece and the lapping tool in the process of form lapping, is proposed. The mathematical model which the installing translation error influences on the workpiece surface shape error is established. The changing rule of the error is simulated through the calculating example of the paraboloid workpiece. The results indicate that the surface shape error of the workpiece is increasing with the increase of the installing translation error, it is also increasing gradually along the center point of the curve surface to the edge, and the influence is severer to the curve surface with great curvature than that of the small curvature when the translation error is the same.     

Experimental Research on Output Performances of Giant Magnetostrictive Actuator

The paper introduces the performances of magnetostrictive actuators and its applications, discusses the design methods for the structure and internal magnetic circuit of a giant magnetostrictive actuator, and makes tests on the output displacement and force characteristics for an actuator using homemade magnetostrictive material. The experimental result shows that the actuator has satisfactory output precisions and ranges in transient and stable states, and can be used in lowfrequency vibration control system of precise equipment.     

Overview of Anti-tank Mines

First the different anti-tank mines laying possibilities are shortly summarized： hand emplaced, with mine layers, ground or helicopter relatively topographical well defined, and with cluster systems of projectiles, rockets and aircraft dispensers. Then examples of the three generations of anti-tank mines are presented：Ⅰ generation： detonating only beneath the track; Ⅱ generation： detonating beneath the track and belly; Ⅲ generation： mines with off-route actions. Weight and cost comparisons are strongly favoring the off-route Ⅲ-generation mines.     

A Finite Element Analysis on Static Strength of a Complex Section

A static finite element analysis （FEA） of an impulsive controller section is presented. The boundary condition and a part of the loads are applied. Considering the grades of the stress around the holes being large, the dense grids are adjusted accordingly. Four cases with different loads are compared, thus the influences of different loads on the section are analyzed. Numerical results show that the maximum stress of the section is lower than the strength limit of the material, and the section will not be broken with the static loads.     

Discussion on Mechanism of Breech-Blow Caused by Propellant Charge

From the view point of launch safety caused by fracture of propellant charge, this paper points out that the safety criterion of pressure wave is inadequate to evaluate the launch safety of propellant charge based on the initial negative differential pressure and sensitivity tests. Generally, the maximum barrel pressure does not depend upon the intensity of pressure wave correspondingly. The pressure wave intensity can not describe the fracture degree of propellant charge in chamber and reflect the mechanical environment of propellant charge fracturing exactly and wholly. The evaluation criterion for launch safety of propellant charge should be built on the basis of depicting the fracture degree of propellant bed.     

Experimental Studies of Toxicity on HNIW and Its Intermediates

The polycyclic nitramine hexanitrohexaazaisowurtane（HNIW） is a compound of high energy density. HNIW can replace 1, 3, 5-trinitro-1, 3, 5-triazacyclohexane（RDX） or HMX, hut its toxicity is unknown. In this paper, HNIW, hexabenzylhexaazaisowurtzitane （HBIW）, tetraacetyldibenzulhexaazaisowurtzitane （TADBIW）, tetraacetyldiformylhexaazaisowurtzitane（TADFIW） and tetraacetylhexaazaisowurtzitane（TAIW）, which are intermediates of the synthesis of the HNIW, were selected as the tested objects in acute toxicity test, acute eye stimulation test and skin irritation test according to the standards of ＂chemical product testing method-401 ： acute oral toxicity test＂, ＂chemical product testing means-405： acute eye irritation/corrosion test＂ and ＂chemical product testing means-404： acute dermal irritation/corrosion test＂ of National Circumstance Protect Bureau. The results show that all of the five objects have no toxicity, no stimulation to eye and skin under the tested conditions.     

Dynamic Simulation for Missile Erection System

In order to study the dynamic characteristics of the missile erection system, it can be considered as a rigid-flexible coupling multi-body system. Firstly, the actual system is abstracted as an equal and simplified one and then the forces applied to it are analyzed. Secondly, the rigid-flexible coupling dynamic simulation for erection system is accomplished by use of the system simulation software, for example Pro/E, ADAMS, ANSYS, MATLAB/Simulink, etc. Finally, having the aid of simulation results, the kinetic and dynamic characteristics of the flexible bodies in erection system are analyzed.The simulation considering the erection system as a rigid-flexible coupling system can provide valuable results to the research of its kinetic, dynamic and vibrational characteristics.