Table of Content

15 December 2014, Volume 34 Issue 6

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Study of Adaptive Light Source for Photoelectric Autocollimator

ZHOU Jun；WANG Kai-lei；SHA Chun-zhe；WANG Chun-xi；WANG Zhan-tao

2014, 34(6):  1-3.  doi:10.12060/j.issn.1000-7202.2014.06.01

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The Method of adaptive light source design has been introduced. The condition of the using environment and reflectplane is reduced, by using the principle of feedback revised adaptive light source automatically. The commonness and precision in measurement have been improved by using this method.

Analysis of Electronic Theodolite Measurement Systerm on Intersection Measurement Error

WANG Dong-wei；JIANG Li；CHEN Xiao-hui；LIU Yong；HUO Xiao-fei

2014, 34(6):  4-8.  doi:10.12060/j.issn.1000-7202.2014.06.02

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As an important means of large-size non-contact measurement, the measurement precision is affected by the accuracy of the instrument, the correctness of personnel operation and the integrity of measurement methods. The intersection measurement error of the electronic theodolite measuring system is analyzed. Firstly, the measurement principle of electronic theodolite measuring system is introduced. Secondly, the effects of different factors on the measurement results are analyzed and compared.The results showed that the analysis has a value for applications, and provided a reliable basis to improve the measurement precision.

Design of Four Axis Aircraft Attitude Control System

WANG Jin-hong；CHENG Yi；QIAN Hong-liang；XIE Fei

2014, 34(6):  9-13.  doi:10.12060/j.issn.1000-7202.2014.06.03

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A set of four axis aircraft PC monitoring system is designed. To accurately grasp the real-time attitude, position information of the four axis aircraft and to precisely control the four axis aircraft, the monitoring system is developed by the host computer to realize four axis aircraft attitude data acquisition, communication and control functions. The function design of the control system is good and friendly man-machine interface enables the user to accurately grasp the flight information of four axis aircraft flight. So four axis aircraft is controlled more accurately. Experimental verification, the monitoring system is simple and practical, stable performance, high precision, which makes the anti-interference ability of control system stronger, maintains better robustness and stability.

Research on Carrier-based Aircraft′s Rapid Transfer Alignment Under Moving Base Conditions

XU Jing-shuo；LUO Tian-ying；MA Shi-guo

2014, 34(6):  14-18.  doi:10.12060/j.issn.1000-7202.2014.06.04

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 In order to study the way how the sea conditions and the carrier mobility affect on carrier-based aircraft SINS′rapid transfer alignment, using the attitude error angle as research object,a specific force equation and attitude differential equation of inertial navigation system are established. The error model of velocity matching and velocity plus attitude matching are deduced detailly based on error propagation mechanism. Then simulating and analyzing are carried out with Kalman filter algorithm. The simulation results show, a certain swing amplitude is more conducive to aircraft’s velocity matching or velocity plus attitude matching. Under typical sea conditions, the velocity matching transfer alignment is affected more obviously by aircraft carrier’s line motion.

Analysis on Measurement Aaccuracy Factors for Condensation Dew-point Hygrometer

LI Tie-peng

2014, 34(6):  19-23.  doi:10.12060/j.issn.1000-7202.2014.06.05

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The principle of dew-point hygrometer is introduced, the influence factors in measurement of hygrometer is analyzed, the Kelvin equation is got, through calculating the influence of Kelvin effect. Furthermore the forming process and principle of Ural effect and super-cooled water are analyzed, on the base the means of reducing these influence factors is put forward.

Design of Gas Pressure Regulation System Based on Fuzzy-PID Controller

GU Ya-xiong；HUANG Zhen；CAO Ya-jun

2014, 34(6):  24-28.  doi:10.12060/j.issn.1000-7202.2014.06.06

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In the gas regulator station automatic monitoring system，it is hard to control for gas pipeline pressure. Based on conventional PID control and fuzzy control, the concept and design of the fuzzy PID controller are presented to control gas pipeline pressure. The simulation results indicate that Fuzzy PID controller has superior performance, less overshoot, quicker rise time and shorter adjusting time comparing with routine controller.

Dynamic Simulation Analysis of Wind-resistant Performance for a Tethered Balloon

LI Hong-quan；Wang Lei

2014, 34(6):  29-32.  doi:10.12060/j.issn.1000-7202.2014.06.07

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Tethered balloon is applied in many scopes by it’s characteristic, and have a great future. The ambient wind influences flight stability, so wind-resistant performance becomes the important guide line of whole system. There is no method to validate test for air attitude, and computer simulation is introduced as usual.The parts that compose the whole are introduced in this article, the flight state is described, the correlation curve is investigated between pitch angle and time and between roll angle and time by modeling dynamic equation and putting on 1-consine discrete-gust model. The numerical simulation is reference to this tethered balloon design, and is helpful to aerostat safety.

Design of a High Integrated and High Reliability Displacement and Differential Pressure Signal Transmitter

YANG Ming；WANG Wei；WANG Zhen；LI Wen-zhang；MA Ya-jun

2014, 34(6):  33-36.  doi:10.12060/j.issn.1000-7202.2014.06.08

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The structure and improved features compared to the traditional of a new transmitter for the control system are introduced. No lead structure connected with hyperbola pin and socket is used for the transmitter. Displacement signal and differential pressure signal chip are integrated as a new chip. Sine wave function oscillator and power amplifier are used for driving the sensor. The principle of synchronous demodulation measurement signal is used, new designs are used for the optimization of power supply circuit, filter circuit and temperature drift compensation circuit, to improved the accuracy, integration and reliability of the transmitter for the control system with various environmental trial and experiment test.

Analysis of Pierce Oscillator Circuit Tunning Characteristics #br# and its Application in Airbore Frequency Synthesizer′s #br# Acceleration Effect Compensation

LIU Zhong-yan；SHAN Qing-xiao；GENG Yun-ling

2014, 34(6):  37-41.  doi:10.12060/j.issn.1000-7202.2014.06.09

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Aircraft frequency synthesizer is an important part of the vehicle, and its performance directly determines the quality of the whole system. As the core part of the frequency synthesizer, the crystal oscillator is sensitive to vibration or impact force which will cause the frequency jitter and phase noise degradation. After having analyzed the pierce oscillator circuit which is the most commonly used in a crystal oscillator, this paper establishes the test circuit, and obtains the pierce circuit’s pulse response. The tuning circuit based on variodes is also applied to the actual compensation circuit. The experimental results show that it achieves a good compensation effect when the vibration frequency is less than 100Hz.

Design and Realization of the Hardware in Loop Simulation System of a UAV

JIANG Yang；WEI Zai-min

2014, 34(6):  42-44.  doi:10.12060/j.issn.1000-7202.2014.06.10

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The hard-ware in loop simulation system is designed to meet the requirements of the development and experiment of a UAV system. The dynamic and kinematics model has been constructed and sensors have been used in the simulation. The general design of the UAV has been realized and the reliability of the flight control software and the validity of the control law have been tested.

Improved Frequency Temperature Stability Method for High Frequency Wide Voltage Controlled Crystal Oscillator

HAN Yan-ju；YANG Ke；ZHENG Hong-yao

2014, 34(6):  45-48.  doi:10.12060/j.issn.1000-7202.2014.06.11

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 High frequency and wide voltage controlled crystal oscillator(VCXO) is widely used in all kinds of receivers and transponders, and the operating temperature range is usually -40℃～+85℃. The frequency temperature stability of this kind of oscillator is easily worse than that of the inner crystal resonator. So, the reason was analyzed, and the method was provided by reasonably controlling the oscillator circuit voltage controlled range and the resonator drive level to improve the high frequency VCXO frequency temperature characteristics. In the end, four  102.3MHz VCXOs were made and tested. The results were better than the performance demands, and sufficiently proved the method validity.

Visual Simulation of SINS/GNSS Integrated Navigation System

WANG Xiao-fei；XU Jing-shuo；ZHANG Sheng

2014, 34(6):  49-54.  doi:10.12060/j.issn.1000-7202.2014.06.12

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For errors accumulating over time, a simulation system of SINS/GNSS integrated navigation based VC++ is design. According to  the actual flight path of simulate aircraft flight control module, the true value of inertial measurement device is obtained. Using Visual Studio 2005, the realsolvers and GNSS simulation are finished, and the output correction is completed, enabling dynamic digital simulation of integrated navigation system. Program results show that the integrated navigation system can overcome the error accumulation feature of the inertial navigation system, navigation parameter error does not drift over time, can be used for a long time navigation.

High Precision Time Synchronization System Based on Digital Technology

XING Yan；CHEN Yong-qi；HU Yong-hui

2014, 34(6):  55-60.  doi:10.12060/j.issn.1000-7202.2014.06.13

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High-precision time and frequency system is used as the basis for modern warfare to achieve precision strike, and the punctuality is considered to be the foundation and core of the high-precision time and frequency system. With the development of satellite positioning and timing system, by using the standard time signal remote transmission in the local acquisition of high precision time is used as a cheaper and convenient method. The time synchronization method and a kind of high precision time synchronization and time-keeping system are researched in this paper. The test results show that the system has good application effects, and it can be widely used at the time of communication, electric power, traffics , computer network synchronization and other fields.

Design of Radar Signal Generator Based on CPLD

KOU Qiong-yue；ZHANG Lei；ZHANG Xin-qin

2014, 34(6):  61-65.  doi:10.12060/j.issn.1000-7202.2014.06.14

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With powerful function and high performance of radar system required in modern war, the signal generator，as a key component of the radar system, is facing more challenges. Aimming at the difficulties about the dynamic target simulation on radar test, a new design method of radar signal generator based on CPLD is proposed. The signal generator adopts the complex programmable logic device (CPLD),and uses the dial code switching to generate complex combinatory logic succession which can control radar waveform producer and the frequency synthesizer for generating many kinds of high frequency target echo signal to simulate actual target on air. The complete function inspection and testing of radar were achieved while the radar transmitter is not opened. The simulated target echo signals were tested , showing that this system meets the design requirements.

Close Degree Classification of Indoor Positioning Algorithm Based on Bluetooth 4.0

MO Qian；XIONG Shuo

2014, 34(6):  66-70.  doi:10.12060/j.issn.1000-7202.2014.06.15

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Bluetooth 4.0 technology has been widely used in mobile phone, tablet computer and mobile terminal equipment.Meanwhile, it makes using of the indoor position has a very broad application prospects. In this report, according to the investigation of the Bluetooth 4.0 technology, to classify as close degree in terms of the loss characteristics of Bluetooth 4.0 RSSI, it proposes an improved algorithm to define the region k-nearest neighbor. Using the optimized algorithm of RSSI fingerprint positionto makes average error of indoor position reach decimeter level. Thus it fully satisfies commercial demand in terms of position accuracy of indoor LBS “decimeter level” and response of “Second level”.

Design of Testing Software for Digital Conversion Device Based on LabWindows CVI

LI Dan-jia；CHEN Di；MA Ya-jun；DENG Song-bo

2014, 34(6):  71-75.  doi:10.12060/j.issn.1000-7202.2014.06.16

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As spacial test equipment on ground dedicated to the digital converter on arrow, digital conversion test-bench has important application value for aircraft data transmission. Digital conversion test-bench software systems are developed based on the LabWindows/CVI software platform.This system realizes the unit test of digital converter on the arrow and provides signal source for the testing system.

Fault Detection for Civil Aircraft Bleed Air Systems Based on Bayesian Network State Classification

LIANG Kun；ZUO Hong-fu；SUN Jian-zhong；LI Huai-yuan；DING Xun；LIU Ruo-cheng

2014, 34(6):  76-83.  doi:10.12060/j.issn.1000-7202.2014.06.17

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The technology of condition monitoring and health management is the breakthrough key technical of the domestic civil aircraft operators support. With civil aircraft bleed air system as the object of the research，a fault detection process based on flight data is designed and a method of fault detection for civil aircraft bleed air systems are proposed by the same state data extraction using bayesian network classification and exponentially weighted moving average control chart. The method is validated by using actual data collected in airline.The results show that the proposed method not only can detect fault for civil aircraft bleed air system, but also found fault ahead of time, which provides support for the airline to arrange aircraft maintenance programs reasonably, reduces aircraft downtime.

Research for Ship-based UAV Flight Safety Evaluation Method

YANG Zai-qing；LIU Zhi-qiang

2014, 34(6):  84-88.  doi:10.12060/j.issn.1000-7202.2014.06.18

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The failure mode and effect analysis, and the risk assessment matrix are effective methords of safety analysis and evaluating. According to the need of the example analysis,the ordinary methord and process are provided, The flight safty of ship-based UAV is analyzed and evaluated, the improvement method is put forward on the basis of result. It is useful reference for engineer.

Design and Realization of Metrology Management System for Calibration and Test Laboratory

ZHUANG Shuang-yong；CHEN Huai-yan

2014, 34(6):  89-94.  doi:10.12060/j.issn.1000-7202.2014.06.19

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A management system for Calibration and Test Laboratory havs been developed to solve the problems such as lower working efficiency, shorter management ability. By using this system, we can realize the netted opeartion about calibration and test work flow based on process control, we can also manage and search all kinds of metrology data and archives on network. This system optimizes the working model of the quality management system. In this article, we give the design and some key technology about the system developing.