Table of Content

15 June 2012, Volume 32 Issue 3

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A New Style of Radar Noise Figure-measuring Instrument to Fit Scene Support

QI Ying-wei；LI Ji-zhong

2012, 32(3):  1-4.  doi:10.12060/j.issn.1000-7202.2012.03.01

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The noise figure of radar receiver can affect the radar range directly, and it is an important technical parameter to scale radar receiver’s working capability. In view of the demands of the scene support equipment, a large dynamic logarithmic amplifier AD8310 is selected, and a delicated radar noise figure-measuring instrument is designed, Which can adapt to the large dynamic of radar receiver and the change of temperature in fields , and have been tried out on a radar support system of antiaircraft security successfully.

DUT Matching Characteristic Measurement Under High Power Pulse Condition

SUN Xin-li；CHEN Gang；BAI Hao

2012, 32(3):  5-7.  doi:10.12060/j.issn.1000-7202.2012.03.02

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This paper introduces the measurement principle of reflectometer, presents a solution to solve the DUT matching characteristic measurement under high power pulse condition by designing an asymmetric double directional coupler, points out the advantages of this method, and analyzes the uncertainty of measurement results of the reflection coefficient.

Design and Realization of Airborne Radio Navigation Simulation System

SI Yu-xuan；LI Wei-ming；ZHANG Yi

2012, 32(3):  8-12.  doi:10.12060/j.issn.1000-7202.2012.03.03

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The radio navigation system is primary facility of aircraft and fidelity of simulation affects the training effect directly. Firstly, total simulation framework is established, constitution and design of software and hardware system is discussed in detail. Secondly, simulation methods of various navigation devices are put forward. Lastly, simulation model of direction finder error is designed based on the analysis of direction finder error arisen reason and multifactors of environment are considered. Simulation precision of radio navigation is improved. At present, the system is used in flight simulation and works well.

The Frequency Characteristic of High Stability Crystal Under Space Radiation Environment

YAN Dong-liang；HAN Hong；YANG Xi

2012, 32(3):  13-16.  doi:10.12060/j.issn.1000-7202.2012.03.04

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In order to insure the high stability crystal on satellite to work normally, the change of frequency character needs to be researched under space radiation environment, using ground radiation device to simulate space radiation environment, and phase noise, short term frequency stability, harmonics, spurious and output power also need to be researched.

Analysis the Error of the ASF in Long-wave Time Service

LI Rui-min；SU Jian-feng；WANG Na

2012, 32(3):  17-20.  doi:10.12060/j.issn.1000-7202.2012.03.05

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To improve the long-wave timing accuracy, the factors were analyzed that affected the errors of ASF. In the progress of calculated the ASF by Millington algorithm, experiments were designed to point at the errors of the map location, the ground conductivity and the region segmentation, then, collected data and analyzed the results. Finally, the new methods to reduce the errors of ASF put forward.

The Design of Digital Phase-Locked Loop

WANG Peng-yu；LV Shan-wei

2012, 32(3):  21-24.  doi:10.12060/j.issn.1000-7202.2012.03.06

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Based on the existing theories, the paper deeply analyzed the high-order phaselocked loop control progress and its digitization, and presents a simple way to design the high-order digital phase-locked loop.

Develop of IGS Real-time Data to be Automatic Download Software Based on LabWindows/CVI

ZHU Lin；ZHANG Hui-jun；LI Xiao-hui

2012, 32(3):  25-30.  doi:10.12060/j.issn.1000-7202.2012.03.07

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With the Global Navigation Satellite System (GNSS) development, various data and products that the international GNSS service organization (IGS) generated are more precise and widely used. A software is designed to download data and products from FTP server of IGS. It is stable and reliable. Meanwhile, it provides automatic services for IGS data and products.

Research on AC Voltage Standard Based on Josephson Effect

ZHU Zhu；KANG Yan；WANG Lu；HU Yi-fei

2012, 32(3):  31-34.  doi:10.12060/j.issn.1000-7202.2012.03.08

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This paper describes the principle, realization methods of AC voltage standard based on Josephson effect and sources of uncertainty. The performance of AC voltage standard using the methods of synthesis waveforms and pulse-driven is compared. The AC  voltage standard using the methods of synthesis waveforms is applicable to establish low-frequency metrology standard and using the methods of pulse-driven is applicable to establish highfrequency metrology standard.

Research on Calibration of Low Current Measurement Unit

XU Ying-chun；MO Wei；LIU Chong；YU Li-hong

2012, 32(3):  35-38.  doi:10.12060/j.issn.1000-7202.2012.03.09

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Low-current test instruments (such as the electrometer, Pico ammeters, source/measure units, semiconductor precision analyzers, etc.) play an extremely important role in the electronic and aerospace field and model engineering. The current measurement resolution level of fA grade touched its physical limit. It is a new metrology challenge that the precision low current measurement instruments of high sensitivity and strong resolution are calibrated. Fluke Instrument's 5440B and self-developed NIM-TΩ was used to constitute test platform in this article to calibrate Keithley Instrument's 6517B (current range: 20pA~2μA). Visual C + + 6.0 was used to develop calibrating software through analysis of measurement results. The metrology difficult problem of low current measurement unit calibration was solved.

The Radiation Testing Research of Radiometric Calibration Source of the Large Aperture Integrating Sphere

YE Zhao；REN Jian-wei；LI Bao-yong；LI Xian-sheng；LIU Ze-xun；WAN Zhi

2012, 32(3):  39-44.  doi:10.12060/j.issn.1000-7202.2012.03.10

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At present, the space optical remote sensor of china is heading for a large-scale, high-precision development. With that, radiometric calibration device also develops. Systematically, this paper describes the test method that is used to detect the radiance of the large aperture integrating sphere. A testing system is manufactured to test the radiation characteristics of the large aperture integrating sphere, including not only the uniformity, the stability, the cosine characteristics, but also the output uncertainty of the integrating sphere light radiation source calibration system. The diameter of the integrating sphere is 3 000mm, the Opening diameter of the integrating sphere is 1 000mm. Obtained results indicate that the uniformity is 0.11%, the maximum offset of the cosine characteristics is 1.1% at ±20°, and the output uncertainty of this system is 5.94%.

Analysis of the Distortion and Light Path of Viewport Windows Used for Ground Regulator of Star Senor in Vacuum Environment

ZHANG Jun-xiu；LIU Jun-song；JIANG Wen；LIU Peng；CAO Yu-mei

2012, 32(3):  45-51.  doi:10.12060/j.issn.1000-7202.2012.03.11

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The design of viewport windows is a key link of designing ground regulator of star senor. It has an effect on adjusted precision of ground regulator of star senor. The viewport window is distorted when it is extruded. The distortion and medium can warp light path, so the star senor that cannot receive the original light will have bad adjusted precision. The dissertation is about a way to solve the problem using the ANSYS and MATLAB. The method can simulate the distortion of viewport and calculate the actual light path, so the method can provide the parameters for compensation of ground regulator of star senor.

A New Amplitude Measurement Method for Signual Signal Based on Double Channel

ZHENG Sheng-feng

2012, 32(3):  52-55.  doi:10.12060/j.issn.1000-7202.2012.03.12

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The accuracy of traditional method for amplitude detection based on auto-correlation is not high,and a new method for amplitude of weak sinusoidal signal in powerful noise based on dual-channel is introduced in this paper. According to the statistical properties of sinusoidal signal and noise Using synchronous sampling to get the amplitude information of original signal, and each factor which affects the result of the Algorithm is analyzed. The simulations proves its feasibility and effectiveness to detect the weak sinusoidal signal and having much higher resolution than auto-correlation method. So it has some practical value.

Development of Virtual Panel Instrument Driver Based on the .NET Interface

WANG Hong-hui；LIU Bi-ye；YANG Hua

2012, 32(3):  56-60.  doi:10.12060/j.issn.1000-7202.2012.03.13

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Introduce the characteristics of virtual panel instrument and invoking of the .NET interface on the LabVIEW platform. Take the WLAN module of N4010A for example, based on operation and parameter setting of the instrument virtual panel, by developing .instrument driver with .NET component, realize the automatic control of the instrument.

Vacuum Tested System of Locale Based on Virtual Instrument Technology

JIA Jun-wei；ZHANG Shu-feng；WANG Huan；TIAN Hu-lin

2012, 32(3):  61-64.  doi:10.12060/j.issn.1000-7202.2012.03.14

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Vacuum tested system of locale testing ranges from 10⁵Pa to 2×10^-9Pa. In this article, the hardware composing and working principle is introduced. The system is made up of capacitance diaphragm gauges, reference gauges, extractor gauges and flange fittings. Based on the Labview software, to meet the demand of ordinary type service, an vacuum tested system of locale program is developed. This software can be applied to the testing of kinds of vacuum equipment, provides modular structures which may automatically deal with the date of tested machines, and the original record and certificates can go into mass production automatically.

Automatic Measurement Control System Design for A Starter Rotational Speed Shutoff Device

XU Min

2012, 32(3):  65-68.  doi:10.12060/j.issn.1000-7202.2012.03.15

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Adopted high speed single chip C8051F020 and VNH3SP30 packaging bridge motor driven chip control electric machine velocity abreast row rotational speed data acquisition, ground measurement control system for the aircraft starter rotational speed shutoff device is developed. Practical operation shows that the system is capable of ensuring proof speed rise slope of consistency, catching cutoff RPM level reliably, stable work and friendly manmachine interface.

The Development of the GUI of a Data Acquisition and Reacting Software Based on VxWorks

YANG Wei

2012, 32(3):  69-74.  doi:10.12060/j.issn.1000-7202.2012.03.16

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Through introducing the WindML, the graphical component of embedded real-time operation system VxWorks, and the framework of applying it to develop Graphical User Interface (GUI), the paper emphatically expatiates the requirements of the man-machine interface of acquisition and reacting software in a data acquisition device and the process of design and realization of it using WindML.

Research on Auto Test Management System

LI Tao；WANG Bin；ZHANG Qiang

2012, 32(3):  75-78.  doi:10.12060/j.issn.1000-7202.2012.03.17

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For the purpose of auto test management system development, electronic measurement instrument IO interface is analyzed, and a general object-oriented  encapsulation method for virtual instrument software function model is proposed .Then, instrument synchronization control solutions are described, and an auto test management system structure is presented. Lastly, based on BLOB, a method to store and retrieve unstructured data such as frequency spectrum data is proposed.