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Contents
2001
Volume: 20 Issue 2
19 Article(s)
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Research Article
VISION-BASED MOVING VEHICLES DETECTION IN INTELLIGENT TRANSPORTATION SYSTEMS
[in Chinese], [in Chinese], and [in Chinese]
A new moving vehicle detection method in complicated background was presented. First, moving regions are detected using the motion information of three frames by a statistical method, then the results of motion segmentation are regulated using the region information produced by static segmentation. And an image enhanceA new moving vehicle detection method in complicated background was presented. First, moving regions are detected using the motion information of three frames by a statistical method, then the results of motion segmentation are regulated using the region information produced by static segmentation. And an image enhancement technique is proposed to improve the effects of segmentation. The results can be used as the basis of advanced vehicle control and traffic management in intelligent transportation systems (ITS)..
Journal of Infrared and Millimeter Waves
- Publication Date: Apr. 01, 2001
- Vol. 20, Issue 2, 81 (2001)
DESIGN OF TRACKING GATE IN INFRARED SEARCH AND TRACK SYSTEMS
[in Chinese], [in Chinese], and [in Chinese]
The sources of the prediction error were analyzed; and the distribution and the propagation of the error were considered. The measurement error of the target and the velocity error of the ownship were calculated. The error caused by target maneuvering was considered. Then how to obtain the tracking gate of the minimunmThe sources of the prediction error were analyzed; and the distribution and the propagation of the error were considered. The measurement error of the target and the velocity error of the ownship were calculated. The error caused by target maneuvering was considered. Then how to obtain the tracking gate of the minimunm volumn was discussed. The relation between the scanning method of the system and the tracking gate was also analyzed. After the state equation and measurement eqution were formed, a conventional Kalman filter was used for multi-target tracking. And the result illustrates that the design of tracking gate is better than before..
Journal of Infrared and Millimeter Waves
- Publication Date: Apr. 01, 2001
- Vol. 20, Issue 2, 87 (2001)
ADAPTIVE NONUNIFORMITY CORRECTION OF IRFPA
[in Chinese], and [in Chinese]
Based on the analysis of the present algorithms of IRFPA nonuniformity correction (NUC), a new adaptive technique was discussed， to which the wavelet filter theory was applied. With the scale decomposition of image sequences on the time field and the corresponding statistics' calculation, the offset and gain coeffiBased on the analysis of the present algorithms of IRFPA nonuniformity correction (NUC), a new adaptive technique was discussed， to which the wavelet filter theory was applied. With the scale decomposition of image sequences on the time field and the corresponding statistics' calculation, the offset and gain coefficients in IRFPA NUC were obtained. Its effectiveness and superiority were verified by simulation..
Journal of Infrared and Millimeter Waves
- Publication Date: Apr. 01, 2001
- Vol. 20, Issue 2, 93 (2001)
STUDY OF THE APPLICATION OF RBF NETWORK TO MULTI-SPECTRAL THERMOMETRY
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The application of artificial neutral network to data processing of multi-spectral radiation thermometry was presented. By taking advantages of neutral network and various emissivity samples, the emissivity models of the targets were identified and the true temperature and spectral emissivity were available simultaneouThe application of artificial neutral network to data processing of multi-spectral radiation thermometry was presented. By taking advantages of neutral network and various emissivity samples, the emissivity models of the targets were identified and the true temperature and spectral emissivity were available simultaneously. The measurement accuracy was improved further by subdivision. The effects of measurement errors on the measurement accuracy of temperature and emissivity were also analyzed. Computer simulation results proved that the method is an effective way for both temperature and emissivity measurements..
Journal of Infrared and Millimeter Waves
- Publication Date: Apr. 01, 2001
- Vol. 20, Issue 2, 97 (2001)
EXPERIMENTAL RESEARCH ON THE APPLICATION OF PASSIVE MICROWAVE REMOTE SENSING TO THE STABILITY MONITORING OF CONCRETE ENGINEERING
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Under the experimental condition of loading in isothermal process, the microwave radiation energy of solid matters like concrete varied with the change of pressure. Experiments were carried out considering two polarized states (horizontal and vertical) of 3 wave bands including 2cm, 3cm, and 10cm. The experiments demonUnder the experimental condition of loading in isothermal process, the microwave radiation energy of solid matters like concrete varied with the change of pressure. Experiments were carried out considering two polarized states (horizontal and vertical) of 3 wave bands including 2cm, 3cm, and 10cm. The experiments demonstrated that mechanical energy can directly excite rotation state energy level jump of solid matters (rocks and concrete, etc.) molecules without need of intermediate physical process of heat generating. This phenomenon directly connects stress with microwave radiation energy physically. This paper puts forward experimental basis and lays physical foundation for the remote measurement of stressfield distribution and evolvement of large concrete engineering by passive microwave remote sensing, and for rock engineering’s stability monitoring and stability-failure predicting..
Journal of Infrared and Millimeter Waves
- Publication Date: Apr. 01, 2001
- Vol. 20, Issue 2, 102 (2001)
RADAR TARGET IDENTIFICATION USING NEURAL NETWORK CLASSIFIER BASED ON HMM FRAMEWORK
[in Chinese], and [in Chinese]
A neural network classifier based on HMM framework was proposed.It can be used to identify timevarying signal, which an ordinary neural network lacks of, and can stress the differences of different signals. Evolutionary learning of the neural network weights using genetic algorithm solves the problem of falling into loA neural network classifier based on HMM framework was proposed.It can be used to identify timevarying signal, which an ordinary neural network lacks of, and can stress the differences of different signals. Evolutionary learning of the neural network weights using genetic algorithm solves the problem of falling into local minimum point which BP and Baum-Welch algorithmnace. An example of recognizing radar return signal successfully by the neural netwrok was presented..
Journal of Infrared and Millimeter Waves
- Publication Date: Apr. 01, 2001
- Vol. 20, Issue 2, 107 (2001)
METHOD OF SCATTERING CENTER ESTIMATION BY RADAR TARGET FREQUENCY RESPONSE DATA IN CLUTTER ENVIRONMENT
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The simulation methods of radar clutter with given amplitude distribution and power spectrum were described, and the simulation results of radar clutter were given. A scattering center model of frequency domain of radar target was presented under the clutter environment and its solution method was studied. Finally, theThe simulation methods of radar clutter with given amplitude distribution and power spectrum were described, and the simulation results of radar clutter were given. A scattering center model of frequency domain of radar target was presented under the clutter environment and its solution method was studied. Finally, the experimental results of simulation data and the measurement data of aircraft scale model were given..
Journal of Infrared and Millimeter Waves
- Publication Date: Apr. 01, 2001
- Vol. 20, Issue 2, 111 (2001)
FMCW SHORT-RANGE RADAR OF 3MM WAVE BAND LOU Guo-Wei（Research Institute of Millimeter Wave and Optical
[in Chinese], [in Chinese], and [in Chinese]
A 3mm wave band FMCW short-range radar was studied, including the calculation of its detecting range, the design of its parameters and the analysis of its ranging precision. In addition, the measured results of the 3mm FMCW short-range radar developed by the authors were presented.A 3mm wave band FMCW short-range radar was studied, including the calculation of its detecting range, the design of its parameters and the analysis of its ranging precision. In addition, the measured results of the 3mm FMCW short-range radar developed by the authors were presented..
Journal of Infrared and Millimeter Waves
- Publication Date: Apr. 01, 2001
- Vol. 20, Issue 2, 117 (2001)
MILLIMETER-WAVE THREE-PORT TRANSISTOR DRAIN MIXER
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The analysis and optimizing design for three-port device drain mixer in Ka-band were given. The nonlinear equivalent circuit and its parameters were simulated and obtained from the small signal S parameter and the DC measurements of three-port device. And then, the drain mixer circuit was designed with optimum conversiThe analysis and optimizing design for three-port device drain mixer in Ka-band were given. The nonlinear equivalent circuit and its parameters were simulated and obtained from the small signal S parameter and the DC measurements of three-port device. And then, the drain mixer circuit was designed with optimum conversion gain of the drain mixer which was derived from the harmonic balance method and the conversion matrices method. The test result shows that the mixer has conversion gain 4dB at RF 27.4GHz and LO 33.4GHz/10dBm..
Journal of Infrared and Millimeter Waves
- Publication Date: Apr. 01, 2001
- Vol. 20, Issue 2, 120 (2001)
SPATIAL RESOLUTION OF ELECTROOPTIC SAMPLING WITH BACK-DIRECT SAMPLING STRUCTURE
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The principle and method for measuring the spatial resolution of electrooptic sampling systems were introduced. According to the experimental results, the spatial resolution of the electrooptic sampling instrument established by the authors is 3μm.The principle and method for measuring the spatial resolution of electrooptic sampling systems were introduced. According to the experimental results, the spatial resolution of the electrooptic sampling instrument established by the authors is 3μm..
Journal of Infrared and Millimeter Waves
- Publication Date: Apr. 01, 2001
- Vol. 20, Issue 2, 123 (2001)
THE EFFECT OF TURNING ON ONE-DIMENSIONAL RANGE PROFILE OF SLENDER TARGET HAN Wen-Yong（Department of Electronic Engineering and Information
[in Chinese], and [in Chinese]
The method of synthesizing one-dimensional range profile was studied. It’s a method based on the stepped-frequency high range resolution microwave radar. The effect of rotation on range profile of slender target (scattering points stand alone) was analyzed qualitatively, then the imaging formula and requirement of rangThe method of synthesizing one-dimensional range profile was studied. It’s a method based on the stepped-frequency high range resolution microwave radar. The effect of rotation on range profile of slender target (scattering points stand alone) was analyzed qualitatively, then the imaging formula and requirement of range profile were derived. A detailed analysis for only two scattering points was given quantitatively. In addition, the effect of slender target of many scattering points standing alone was discussed. According to the above analysis, an efficient way to recognize target was provided..
Journal of Infrared and Millimeter Waves
- Publication Date: Apr. 01, 2001
- Vol. 20, Issue 2, 127 (2001)
INITIALIZATION PARAMETER AUTO-CHECK ALGORITHM EXECUTION OF INFRARED THIN FILM MONITORING SYSTEM
[in Chinese], [in Chinese], and [in Chinese]
Initialization parameters used in infrared optical thin film monitoring system, including input coatings, monitoring mode, monitoring wavelength, material coefficients, slice options,etc.,were listed in forms of dialog control. When the user inputs these parameters, the application programme can automatically check theInitialization parameters used in infrared optical thin film monitoring system, including input coatings, monitoring mode, monitoring wavelength, material coefficients, slice options,etc.,were listed in forms of dialog control. When the user inputs these parameters, the application programme can automatically check these parameters' validity to ensure that the contents the user inputs are correct, thus, it supplies a kind of security mechanism for subsequent automatic control of optical thin film process. The corresponding algorithm was also given in this paper..
Journal of Infrared and Millimeter Waves
- Publication Date: Apr. 01, 2001
- Vol. 20, Issue 2, 133 (2001)
CHARACTERIZATION OF UNCOOLED VO2-BASED THIN FILMS BOLOMETER CHEN Chang-Hong（Department of Optoelectronic
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
An uncooled bolometer based on VO2 thin films deposited by reactive ion-beam sputtering was fabricated. The noise and responsivity for the spectral range 8-12μm were measured at 296K. At the chopper frequency of 30Hz, the device having a detectivity D* of 1.89×108cmHz1/2W-1and a thermal time constant of 0.011s wasAn uncooled bolometer based on VO2 thin films deposited by reactive ion-beam sputtering was fabricated. The noise and responsivity for the spectral range 8-12μm were measured at 296K. At the chopper frequency of 30Hz, the device having a detectivity D* of 1.89×108cmHz1/2W-1and a thermal time constant of 0.011s was realized..
Journal of Infrared and Millimeter Waves
- Publication Date: Apr. 01, 2001
- Vol. 20, Issue 2, 136 (2001)
Ka-BAND MICROSTRIP INTEGRATED LOCAL-OSCILLATOR-MIXER ASSEMBLY USED IN PROJECTILE SENSORS JIANG Jin-Shui（Institute of MMW & Optical
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A compact Ka-band microstrip integrated local-oscillator-mixer assembly used in projectile sensors was introduced. The overall configuration of microstrip circuit of this assembly was given. The functions of each component were described. The environment and reliability tests performed on this assembly were explored inA compact Ka-band microstrip integrated local-oscillator-mixer assembly used in projectile sensors was introduced. The overall configuration of microstrip circuit of this assembly was given. The functions of each component were described. The environment and reliability tests performed on this assembly were explored in detail, which include vibration, shock and temperature. The Ka-band local-oscillator-mixer assembly exhibits a 3.4～4.2-dB double side band (DSB) noise figure over a 2-GHz RF bandwidth. LO-to-RF isolation is greater than 27dB over the range of operating frequencies. The frequency stability of local oscillator with dielectric resonator used is less than 60ppm/℃..
Journal of Infrared and Millimeter Waves
- Publication Date: Apr. 01, 2001
- Vol. 20, Issue 2, 139 (2001)
IMPROVEMENT AND CLINICAL APPLICATION OF MEDICAL EXTERNAL MICROWAVE RADIATOR
[in Chinese], [in Chinese], and [in Chinese]
In view of the problems in the clinical application of microwave external radiator, the needle-shaped waveguide excited radiator in the model of coaxial-waveguide transition was replaced by a tapered Archimedian spirals radiator. It improves the standing wave ratio, reduces the radiator's volume and weight and decrIn view of the problems in the clinical application of microwave external radiator, the needle-shaped waveguide excited radiator in the model of coaxial-waveguide transition was replaced by a tapered Archimedian spirals radiator. It improves the standing wave ratio, reduces the radiator's volume and weight and decreases the microwave leak. The result is satisfactory with clinical practices..
Journal of Infrared and Millimeter Waves
- Publication Date: Apr. 01, 2001
- Vol. 20, Issue 2, 143 (2001)
THE STUDY OF FREQUENCY-DOUBLING PROPERTIES OF FERROELECTRIC POTASSIUM LITHIUM NIOBATE CRYSTAL
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The frequency-doubling properties of potassium lithium niobate crystals grown from melts with different content of Li2O were studied by using quasi cw-Ti:sapphire laser. The results showed that potassium lithium niobate crystal does not have nonlinear optical performance unless the Li content in the crystal reached a cThe frequency-doubling properties of potassium lithium niobate crystals grown from melts with different content of Li2O were studied by using quasi cw-Ti:sapphire laser. The results showed that potassium lithium niobate crystal does not have nonlinear optical performance unless the Li content in the crystal reached a certain amount. The higher the content of Li in the crystal, the better the frequency-doubling performance. The results of frequency-doubling experiment of the potassium lithium niobate crystal grown from the melt with Li2O 26mol% showed that the crystal can double the cw-Ti:sapphire laser with the wavelength of 820～960nm so as to obtain the output of blue-green beam. The crystal showed good second harmonic generation properties..
Journal of Infrared and Millimeter Waves
- Publication Date: Apr. 01, 2001
- Vol. 20, Issue 2, 147 (2001)
TRUE TEMPERATURE MEASUREMENT BY RADIATION METHOD BASED ON NEURAL NETWORK MODEL
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The theory of neural networks was applied in the field of multi-spectral radiation thermometry. The experimental results show that the above-mentioned method is an effective method for solving the true temperature measurement.The theory of neural networks was applied in the field of multi-spectral radiation thermometry. The experimental results show that the above-mentioned method is an effective method for solving the true temperature measurement..
Journal of Infrared and Millimeter Waves
- Publication Date: Apr. 01, 2001
- Vol. 20, Issue 2, 151 (2001)
PHOTOELECTRIC PROPERTIES OF PbSe/BaF2/CaF2 FILMS ON Si(111)
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
PbSe films were grown on Si(111) by incorporation of BaF2/CaF2 buffers using molecular beam epitaxy. The measurements of both scanning electronic microscopy and high-resolution X-ray diffraction showed high crystalline quality of the PbSe films. The surface of PbSe was mirror-like and no cracks were observed. The full PbSe films were grown on Si(111) by incorporation of BaF2/CaF2 buffers using molecular beam epitaxy. The measurements of both scanning electronic microscopy and high-resolution X-ray diffraction showed high crystalline quality of the PbSe films. The surface of PbSe was mirror-like and no cracks were observed. The full width at half-maximum of PbSe diffraction peak was only 153 arcsec. The epitaxial PbSe films were used to fabricate photodiodes. For the first time, metallic aluminum was used to form Al-PbSe Schottky diodes, which demonstrated better and more stable current-voltage characteristics than that obtained from Pb-PbSe Schottky diodes..
Journal of Infrared and Millimeter Waves
- Publication Date: Apr. 01, 2001
- Vol. 20, Issue 2, 154 (2001)
STABILITY OF TRANSMISSION Mode GaAs(Cs,O) Photocathodes
[in Chinese], [in Chinese], and [in Chinese]
The influence of illumination intensity and residual gases on the stability of negative electron affinity GaAs(Cs,O) photocathodes during operation was investigated in the present work. A comparison was made between the stability of photocathodes installed in activation chamber and tube body. Studies of the activated GThe influence of illumination intensity and residual gases on the stability of negative electron affinity GaAs(Cs,O) photocathodes during operation was investigated in the present work. A comparison was made between the stability of photocathodes installed in activation chamber and tube body. Studies of the activated GaAs photocathode surface and the surface of GaAs photocathode with sensitivity decaying to zero were made using Auger electron spectroscopy. It was found that the degradation of GaAs photocathodes stems maingly from the interaction of harmful residual gases and photocathode surface..
Journal of Infrared and Millimeter Waves
- Publication Date: Apr. 01, 2001
- Vol. 20, Issue 2, 157 (2001)
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