便携式无线电监测设备天馈系统性能测试方法研究

本文研究了一种基于矢量网络分析仪的便携式无线电监测设备天馈系统性能测试方法。文章介绍了矢量网络分析仪的原理和结构,详细阐述了天线和馈线测试的方法以及数据处理方法,给出了测试设备和连接方法,并分析了实验结果和误差。文章还总结了研究成果的意义和价值,并展望了该技术在无线电管理领域的应用前景。

电信号线自动测试系统的开发与应用

基于Windows的电信号线自动测试系统的开发情况,设计了一种电信号线自动测试系统。主要包括系统的结构、系统功能、软件设计及系统特点等內容。

利用边界扫描进行系统级测试

本文简要介绍了测试总线IEEE 1149.1和IEEE P1149.5,并指出可以利用这两种总线进行系统级测试。究竟选择哪一种总线,要取决于用户的应用和经济承受能力。

Design of IP core for IIC bus controller based on FPGA

The intellectual property （IP） core for inter-integrated circuit （IIC） bus controller is designed using finite state machine （FSM） based on field programmable gate array （FPGA）. Not only the data from AT 24C02C can be read automatically after power on, but also the data from upper computer can be written into AT24C02C immediately under the control of the IIC bus controller. When it is applied to blast wave overpressure test system, the IIC bus controller can read and store working parameters automatically. In a laboratory environment, the IP core simulation is carried out and the result is accurate. In the explosion field test, by analyzing the obtained valid data, it can be concluded that the designed IP core has good reliability.

A scheme on automated test data generation and its evaluation

By analyzing some existing test data generation methods, a new automated test data generation approach was presented. The linear predicate functions on a given path was directly used to construct a linear constrain system for input variables. Only when the predicate function is nonlinear, does the linear arithmetic representation need to be computed. If the entire predicate functions on the given path are linear, either the desired test data or the guarantee that the path is infeasible can be gotten from the solution of the constrain system. Otherwise, the iterative refining for the input is required to obtain the desired test data. Theoretical analysis and test results show that the approach is simple and effective, and takes less computation. The scheme can also be used to generate path-based test data for the programs with arrays and loops.

Bearing Test for Gbps Broadband Wireless System

In this paper,we propose a wireless channel testing method and construct the test platform for the Gbps broadband wireless system.The proposed method is implemented to evaluate the transmission performance according to the acquired field test results.The results have shown that the proposed channel test algorithm is valid and efficient,which can continuously show the variation of system throughput,frame loss rate and latency.

A method for improving reliability communication of LVDS

In order to ensure the reliability and accuracy of low voltage differential signaling(LVDS)used in remote test system serial data transmission,a(7,4)linear block code is proposed.At the expense of a certain effective bandwidth,the bit error rate of data transmission is greatly reduced,and the reliability of data transmission is improved by adding monitoring symbols.The driver CLC001 and the adaptive equalizer CLC012 are used as hardwares to compensate the attenuation of the signal in the long line transmission,improve the signal integrity and ensure the reliability of data transmission.Proved by simulation on a shielded twisted pair cable with a total length of 100 m,this system realizes zero bit error transmission of the serial data at the rate of 240 Mbit/s.

Research on the On-line Monitoring System of Battery Power

Through the comparison of various acquisition technology and related technology theory of the existing scheme, the paper analyze and design the power battery testing platform of the data acquisition system, and give the research design scheme of the utility model through the design of the software on PC and CAN bus, which makes the full synchronization requirements acquisition unit; improve the linearity and stability of total voltage and current acquisition by the integrated circuit, and improve the system sampling rate, effectively complete the corresponding index. Finally, through experimental verification, to ensure the completion of the technical indicators.

Testing System Based on Virtual Instrument for Readout Circuit of Infrared Focal Plane Array

Readout integrated circuit(ROIC) is one of the most important components for hybrid-integrated infrared focal plane array(IRFPA). And it should be tested to ensure the product yield before bonding. This paper presents an on-wafer testing system based on Labview for ROIC of IRFPA. The quantitative measurement can be conducted after determining whether there is row crosstalk or not in this system. This low-cost system has the benefits of easy expansion, upgrading, and flexibility, and it has been employed in the testing of several kinds of IRFPA ROICs to measure the parameters of saturated output voltage, non-uniformity, dark noise and dynamic range, etc.

Computer-based Test of Spoken English Translation Accuracy Evaluation System with Wireless Mobile Terminal

In order to improve the accuracy of spoken English translation evaluation and artificial intelligence, the design of wireless mobile terminal lest of spoken English translation accuracy evaluation system is researched. The system uses four layer construction design as wireless information collection layer, the mobile terminal information fusion layer, network data transmission layer, human computer interactive application layer. The original collection of computer-based spoken English translation information is taken based on host computer communication sensing information processing technology, Bus data transmission of English translation accuracy evaluation system is taken based on B/S structure, the test design process and remote scheduling information fusion are constructed based on LabWindows/CVl and B/S structure mining system, information data processing and cross compiler operation of the spoken English translation test evaluation system are completed in application layer, in the embedded kernel and on the wireless mobile terminal, the evaluation system is developed. The test results show that the integrated scheduling ability of spoken English translation test information system designed in this paper is better than traditional method, the cost time is less, and the control quality of the system is high.

Design and validation of wireless strain test system for bridge based on the resistance strain sensor

In order to achieve an access to strain sensor data with wireless transmission in bridge engineering structure testing, a wireless strain test system is presented based on the resistance strain sensor of networks. The wireless bridge strain test system composed of master station and substation adopts the wireless method to realize the high accuracy data acquisition between the master station and the substation under a reliable communication protocol. The system has been tested in contrast with the present strain apparatus. Results show that the wireless system is high-reliable, and has many characteristics such as high efficiency, good precision, high stability with low cost, and good flexibility, without using the present communication network.

Fuzzy Logic Based Approach in an Enterprise Resource Planning System for Hydraulic Cylinders Assembly

Trends in modern industry show a tendency towards demassovization of production as a response to the customers＇ specific needs for unique and personalized products. This provokes significant changes in the processes of manufacturing, assembly, and testing The cost of such a type of production can be reduced by employing highly productive reconfigurable equipment with proper software to enable optimization. This paper presents a decision support extension for directing of hydraulic cylinders to assembly-testing lines using fuzzy logic in the Enterprise Resource Planning system of a small size production in a factory in Bulgaria. Different assembly-testing lines are flexibly assigned to the specific cylinder＇s parameters by the developed fuzzy system on the basis of the overlapping of parameters in the hydraulic cylinders classification. The final decision on the line assigned in case of alternatives is made through accounting for the minimal cylinder delay time. The effectiveness of the approach is assessed by simulation. It leads to an increase of the efficiency of the assembly-testing flow lines, a reduction of the time needed for hydraulic cylinders assembling and testing and balanced loading of the modules.

Application of Digital Image Monitoring System to Detecting a High Voltage Icing Conductor

A real-time system of numeral image manipulation technology is employed to inspect the dynamic displacement of an engineering structure. First, the CCD vidicon aims at the fixed point. The image of the fixed point on the structure is gathered by a picture gathering card. By processing pictures with a self-programmed software, the real-time space coordinate of the cali- bration device can be obtained. Finally, the data is dealt with to get the movement curve, and the dynamic displacement is carried out. The system is applied to the test of a high voltage icing conductor. The result indicates that the dynamic data of the ice shedding conductor includes jumping amplitude, displacement-time curve and attenuation process.

A simple algorithm for testing the stability of periodic solutions of some nonlinear oscillators with large time delay

Periodic solutions occur commonly in linear or nonlinear dynamical systems. In some cases, the stability of a periodic solution holds if the rightmost characteristic root has negative real part. Based on the Lambert W function, this paper presents a simple algorithm for locating the rightmost characteristic root of periodic solutions of some nonlinear oscillators with large time delay. As application, the proposed algorithm is used to study the primary resonance and 1/3 subharmonic resonance of the Duffing oscillator under harmonic excitation and delayed feedback, as well as the control problem of the van der Pol oscillator under harmonic excitation by using delayed feedback, with a number of case studies. The main advantage of this algorithm is that though very simple in implementation, it works effectively with high accuracy even if the delay is large.