Table of Content

15 February 2014, Volume 34 Issue 1

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Research on the Calibration Technology for Broad-band Comb Generator

JIANG He；GONG Peng-wei；CHEN Bei；XIE Wen；MA Hong-mei；YANG Chun-tao

2014, 34(1):  1-6.  doi:10.12060/j.issn.1000-7202.2014.01.01

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We introduce a method for 50 GHz comb generator calibration using Agilent 86100C sampling oscilloscope. The 70 GHz sampling head measures the output time-domain signal of the comb generator. Then we correct the signal for time base error, including time base distortion, jitter and drift. By transforming the time-domain signal into frequency-domain, we obtain the amplitude and phase spectrum. Then we acquire the calibration data we need. We also determine the uncertainties of the amplitude and the phase, which are less than 0.5 dB and 0.9° respectively.

Experimental Research on Phase Characteristics of High-power-microwave Phase Measurement Channel with Different Excitation Power

WANG Yi；ZHANG Cui-cui；WANG Jian-zhong

2014, 34(1):  7-10.  doi:10.12060/j.issn.1000-7202.2014.01.02

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This paper studies the influence of signal power on the phase measurement in high power microwave. Presents phase delay characteristic measurement of the phase delay characteristics under different excitation power states from mW to kW power level. Measuring system consists of high-power-microwave pulse source, directional couplers groups. Attenuators which are widely used in high-power-microwave phase measurement system were measured. Measurement results show that in 1kW power range, phase delay of those typical devices varies within ±2°, the phase delay characteristics can be considered with no changes for the different excitation power.

Design of Universal Frequency Sweeping Source based on DDS

CUI Yong-shun；WANG Nuan-rang；NIAN Feng

2014, 34(1):  11-13.  doi:10.12060/j.issn.1000-7202.2014.01.03

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Frequency sweep signal source plays indispensability role in transmitter and test device. Designing a kind of flexible frequency sweep device has important significance. The paper analyzes the structure of DDS. Using two DDS IP cores, frequency sweep device is designed. The device which could choose different frequency span, center frequency and sweep pattern, can almost meet frequency sweep source requirement.

Group Delay Calibration of Satellite RF Test System’s Frequency Converter Link based on Pulse Modulation

DENG Qian-lan；XIN Kang；REN Ya-fen

2014, 34(1):  14-18.  doi:10.12060/j.issn.1000-7202.2014.01.04

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Group delay is one of the key performance specification in frequency converter link. Group delay calibration method of satellite RF test system’s frequency converter link is studied in this paper. Satellite RF test system is the important part of Satellite Ground Test Equipment. Its group delay of frequency converter link has important significance for the test of Satellite Ranging and the quality of signal transmission. From the definition of group delay, this paper discussed the test theory and method of group delay and presented the modulation method based on software defined radio technology to measure the group delay. This method is suitable for the precise measurement of frequency converter link that can’t accept other local oscillator. The formula of the modulation method is deduced in detail and the calibrating device is founded in this paper. The result of experiment demonstrate that the modulation method has more precision to measure the group delay.

Research on the Frequency Calculation of the Resonant Sensor for Liquid Density Measurement

SHI Ji-ying；ZHENG De-zhi

2014, 34(1):  19-24.  doi:10.12060/j.issn.1000-7202.2014.01.05

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In order to increase the accuracy of frequency calculation for the density sensor based on the resonance theory, interpolated Fast Fourier Transform algorithm (FFT) algorithm which is based on the existing FFT and more adjusts the actual situation is introduced. The effect of frequency changes and the noise on results of frequency calculation is also analyzed. Comparative analysis for the commonly used windows is made through Matlab, and Rife_Vincent window is chosen finally. In addition, experiments have been carried out on the hardware system designed. The experimental results confirm that the calculation error is less than 0.1 Hz by means of the interpolated FFT algorithm with Rife_Vincent window. The results also test and verify that the method has very high accuracy and is easy to realize.

Design and Analysis of Microwave Signal Source for CPT Cs Atomic Clock

LIAN Ji-qing；CHEN Da-yong；ZHAI Hao

2014, 34(1):  25-28.  doi:10.12060/j.issn.1000-7202.2014.01.06

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CPT atomic clock is widely used in communications, navigation, data transmission and many other fields for its small volume, low power and other advantages. In this paper, we design a microwave signal source with a central frequency of 4596 MHz in accordance with the requirement to microvave signal by the passive CPT Cs atomic clock through digital PLL technology.The signal source with circuit area of 30mm ×50mm and power less than 200 mW has a RF output power range of (-20~-5)dBm, and its output signal’s phase noise is consistent with the theory. Modulated ant a rate of 500 Hz, the signal source can meet the CPT Cs atomic clock’s requirement.

The Development of Calibration System for Special Frequency Agile Generator

ZHU Jun；WANG Wu-hua

2014, 34(1):  29-32.  doi:10.12060/j.issn.1000-7202.2014.01.07

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Frequency agile terminal guidance radar effectively improve the anti-interference ability of the weapon system. Through the analysis of the current testing techniques and construct test platform by using generic equipment and achieve metrological verification of the frequency agile signal source. The system adopted two difference frequency to form intermediate frequency difference detection method to guarantee the precision of instantaneous frequency measure. But the system put forward the innovative single pulse draught frequency excitation test technology, which use the general test instrument to achieve the frequency agile parameter test and it pushes frequency agility measurement technology round to the engineering application stage for the first time, which can avoid the measurement system itself second times measurement problem.

Research on a De-noise Method of the Remote Clock Comparative Data

LI Bian；CHEN Yong-qi

2014, 34(1):  33-36.  doi:10.12060/j.issn.1000-7202.2014.01.08

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It is comparison among remote clocks that is a necessary condition of establishing joint atomic timescale using atomic clocks in different laboratories, so the noise level of high precision time transfer technology, which is used to compare among remote clocks, becomes one of the main factors influencing the performance of atomic timescale. This paper mainly studied the low-pass filtering method based on empirical mode decomposition, and its application for de-noising of the remote clocks comparing data. And it is made to compare this method with Vondrak smoothing one. The results indicate that the lowpass filter results based on the empirical mode decomposition is better than Vondrak smooth ones.

Design & Realization of a Special Frequency Multiplier for Chip-scale Atomic Clock

LIU Lei-ji；ZHAO Hai-qing；CAO Yuan-hong

2014, 34(1):  37-41.  doi:10.12060/j.issn.1000-7202.2014.01.09

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By analyzing the affection on atomic clock stability, the demanding for the frequency multiplier has been offered. In comparison with several typical configurations, a novel frequency multiplier scheme consisting of synthesizer, orthogonal mixer and DDS has been designed. Guided by the design, the first prototype fabricated with individual components has been completed; the frequency stability is 4.7E-12/s after locking, and this design can be qualified for atomic clock. Basing on the design scheme, the special 3.4 GHz ASIC has been fabricated, and the chipscale atomic clock incorporated the ASIC arrived to 5.5E-11/s, which proves that the ASIC can satisfy the design requirements of chipscale atomic clock.

Discussing the Meaning of BeiDou System Time

SUN Hui；WANG Liao-jie；CHEN Hong-qing

2014, 34(1):  42-46.  doi:10.12060/j.issn.1000-7202.2014.01.10

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It has been shown this paper that there are the differences of the definition & explain for BeiDou system time (BDT) among various timing specifications in China. The cognition & resolution for the meaning of BDT has been made clear. It may be useful for standardizing & application of PNT for BeiDou and other GNSS.

A New Method of Phase Difference Measurement of High Frequency Sinusoidal Signal based on Time Comb Technology

ZHENG Sheng-feng；WANG Ben-yi；ZHANG Zuo-li；DI Jin-hai

2014, 34(1):  46-49.  doi:10.12060/j.issn.1000-7202.2014.01.11

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A new method for phase difference measurement based on time comb technology is introduced in this paper. The math model of time comb is given, and its characteristic is analyzed. The principle is used in data acquisition of high frequency. Equivalent sampling technology is abstained from low frequency and measured signal， avoiding high sampling frequency and combined with multilayer correlation technology. Then phase difference is detected when the Nyquist sampling theorem is not satisfied. Simulation results show that the high resolution for high frequency signals especially in low signal-noise ratio condition. It can be widely used in engineering.

Target Detecting and Tracking Method in Middle Trajectory of Ballistic Missile based on Serial Infrared Images

FANG Guo-qiang；TENG Ke-nan

2014, 34(1):  50-56.  doi:10.12060/j.issn.1000-7202.2014.01.12

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This paper proposes a new method to solve the target detecting and tracking problem in middle trajectory of ballistic missile. The state formula and measure formula of the target in the middle trajectory are established by applying the Kalman filter to filter and forecast the target detecting data based on serial infrared images. It is difficult to determine the self-covariance matrix of the system noise and measure noise in the Kalman filter. To solve this problem, the parameters setting method of Kalman filter are studied and the filter parameters setting rules are gained by test the different noise parameters condition using the real experiment testing results. This rule can be applied to detect and track the targets in middle trajectory of ballistic missile and provide reference for the target detecting and tracking technology.

Experiment Research of Second-harmonicgeneration Characteristics in Periodically Poled KTiOPO^₄Crystal

SHI Xue-shun；YANG Le-chen；CHEN Kun-feng；ZHAO Kun；LIU Yu-long；LIU Chang-ming

2014, 34(1):  57-60.  doi:10.12060/j.issn.1000-7202.2014.01.13

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In this paper, we present secondharmonic generation at 518 nm of a narrow-line-width picosecond fiber laser at 1036 nm in crystal of periodically poled KTiOPO₄. The characteristic of temperature and power is investigated. The second-harmonic-generation power for different temperature and different fundamental power are analyzed. The influence of optimized matching temperature for fundamental power is investigated.

An Automatic Loose Particle Detection System for Aerospace Engines

QI Le；ZHAO Guo-qiang；CHEN Jin-bao；ZHAI Guo-fu；LIANG An-sheng；DENG Zhi

2014, 34(1):  61-66.  doi:10.12060/j.issn.1000-7202.2014.01.14

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Aimed at the shortcomings of conventional loose particle detection systems such as low efficiency and low precision, an automatic loose particle detection system for aerospace engines was developed. It was composed of swivel stand driven by motor, driver control circuit, data conditioning and acquisition circuit. With the algorithms of threshold comparison and accumulated average energy comparison, the computer gives results of particle size and location.

Design and Realization of Low-power Environmental Monitor System

SHI Wei-feng；WEI Wei

2014, 34(1):  67-70.  doi:10.12060/j.issn.1000-7202.2014.01.15

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The MCU MSP430F149 is used as core in the system, and the thermometer, photosensitive sensor, wireless module and LCD display are used too. The measure of temperature and light is realized by this system. The system is made of one terminal and two nodes, and all of them contain a suit of wireless module to transmit data. The serial number of nodes and current temperature and illumination can be observed on the terminal. The system is lowpower and used expediently through test.

Design of Digital Torque Wrench′s Wireless Communication based on the Capacitive Technology

WU Huai-ming；SHANG Kai-lun；XUE Ling；HE Xiao-jun

2014, 34(1):  71-74.  doi:10.12060/j.issn.1000-7202.2014.01.16

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With the rapid development of wireless communication technology, wireless communication slowly replaces the original wired data communication in the middle of electrical system. At present, our digital torque wrench based on the capacitive technology is widely used in aerospace, steel, ships, railways and other areas. They have strict requirements for data measurement, data storage. However, the tradition wired data transmission will bring a great measure environment restriction. Which includes transmission distance shorting, the complexity of wiring. Further, the limited data interface of the computer, it is not convenient for transferring large amounts of data due to limited computer transmission interface. This paper designed a wireless communication module by using a lowpower chip, through which currently digital torque wrench communication. This will bring great convenience for the client application, adapt to different environments, and princely performance and market competitiveness. Moreover, the data of multi-device can be achieved simultaneously display to the computer. The product has been tested and verified to achieve the desired effect.

Automatic Metrology System Design based on the DO30 Multi-function Calibration

CHEN Xin-ning；WANG Wu-hua

2014, 34(1):  75-78.  doi:10.12060/j.issn.1000-7202.2014.01.17

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A automatic metrology system based on the DO30-Ⅱ multi-function calibration was introduced in this paper, Including design principle, system constitutes and technique. It focuses on design way of procedure controller and key techniques of the system.The actual application indicates that the control system have solved the Efficiency question of the mostly domestic numerals Appearance Metrology Standard which depend on personally testing and recording. It has the broad application prospects.