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Influence on the Lifetime of ^(87)Rb Bose-Einstein Condensation for Far-Detuning Single-Frequency Lasers with Different Phase Noises
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作者 Peng Peng Liang-hui Huang +3 位作者 Dong-hao Li Peng-jun Wang Zeng-ming Meng Jing Zhang 《Chinese Physics Letters》 SCIE CAS CSCD 2018年第6期24-27,共4页
We study the influence of the phase noises of far detuning single frequency lasers on the lifetime of Bose-Einstein condensation(BEC)of^(87)Rb in an optical dipole trap.As a comparison,we shine a continuous-wave s... We study the influence of the phase noises of far detuning single frequency lasers on the lifetime of Bose-Einstein condensation(BEC)of^(87)Rb in an optical dipole trap.As a comparison,we shine a continuous-wave singlefrequency Ti:sapphire laser,an external-cavity diode laser and a phase-locked diode laser on BEC.We measure the heating and lifetime of BEC in two different hyperfine states:|F=2,m_F=2〉and|F=1,m_F=1〉.Due to the narrow linewidth and small phase noise,the continuous-wave single-frequency Ti:sapphire laser has less influence on the lifetime of^(87)Rb BEC than the external-cavity diode laser.To reduce the phase noise of the external-cavity diode laser,we use an optical phase-locked loop for the external-cavity diode laser to be locked on a Ti:sapphire laser.The lifetime of BEC is increased when applfying the phase-Jocked diode laser in contrast with the external-cavity diode laser. 展开更多
关键词 Influence on the Lifetime of Rb Bose-Einstein Condensation for Far-Detuning Single-Frequency Lasers with different phase Noises BEC
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The microstructural nanoindentation characteristics of different phases in precision annealed GCr15 steel
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作者 Zhang Junbao Yang Xiaoping Wang Xiufang Shi Bi Song Hongwei 《Baosteel Technical Research》 CAS 2008年第4期51-54,共4页
This study characterizes the mechanical properties and volume fractions of the different phases in precision annealed GCr15 steel using nanoindentation technology. Experimental results indicate that the nanoindentatio... This study characterizes the mechanical properties and volume fractions of the different phases in precision annealed GCr15 steel using nanoindentation technology. Experimental results indicate that the nanoindentation hardness of cementite grains is between 14.15 GPa and 17.61 GPa,with a mean value of 15.40 GPa. This hardness is much higher than the hardness of ferrite grains. The nanoindentation hardness of ferrite is between 2.78 GPa and 4.89 GPa, with a mean value of 3.35 GPa. The volume fractions of the different phases were also determined using nanoindentation technology, and the volume fraction of cementite in the steel was identified as 15%. 展开更多
关键词 NANOINDENTATION GCr15 steel mechanical properties of microstructures volume fractions of different phases
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Enhanced performance of oxygen vacancies on CO_(2) adsorption and activation over different phases of ZrO_(2) 被引量:1
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作者 Juntian NIU Cunxin ZHANG +2 位作者 Haiyu LIU Yan JIN Riguang ZHANG 《Frontiers in Energy》 SCIE CSCD 2023年第4期545-554,共10页
The effect of oxygen vacancies on the adsorption and activation of CO_(2) on the surface of different phases of ZrO_(2) is investigated by density functional theory(DFT)calculations.The calculations show that the oxyg... The effect of oxygen vacancies on the adsorption and activation of CO_(2) on the surface of different phases of ZrO_(2) is investigated by density functional theory(DFT)calculations.The calculations show that the oxygen vacancies contribute greatly to both the adsorption and activation of CO_(2).The adsorption energy of CO_(2) on the c-ZrO_(2),t-ZrO_(2) and,m-ZrO_(2) surfaces is enhanced to 5,4,and 3 folds with the help of oxygen vacancies,respectively.Moreover,the energy barrier of CO_(2) dissociation on the defective surfaces of c-ZrO_(2),t-ZrO_(2),and m-ZrO_(2) is reduced to 1/2,1/4,and 1/5 of the perfect surface with the assistance of oxygen vacancies.Furthermore,the activation of CO_(2) on the ZrO_(2) surface where oxygen vacancies are present,and changes from an endothermic reaction to an exothermic reaction.This finding demonstrates that the presence of oxygen vacancies promotes the activation of CO_(2) both kinetically and thermodynamically.These results could provide guidance for the high-efficient utilization of CO_(2) at an atomic scale. 展开更多
关键词 CO_(2)activation oxygen vacancies ZrO_(2) different phases
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Treatment of 90 patients with scapulohumeral periarthritis in different phases by combining therapy centering on Fu's subcutaneous needling 被引量:7
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作者 宋海云 《World Journal of Acupuncture-Moxibustion》 CSCD 2015年第4期43-47,共5页
Objective To observe the efficacy of combining therapy in treatment of 90 patients with scapulohumeral periarthritis in different phases. Method Ninety patients with scapulohumeral periarthritis were treated with Fu'... Objective To observe the efficacy of combining therapy in treatment of 90 patients with scapulohumeral periarthritis in different phases. Method Ninety patients with scapulohumeral periarthritis were treated with Fu's subcutaneous needling(FSN) combined with physiotherapy in painful phase, acupotomology and massage in adhesion phase, and appropriate functional exercise in rehabilitation phase. Seven days were considered as one course of treatment, and efficacy evaluation was performed after three courses. Function evaluation of shoulder joint was made. Result The total effective rate was 100%(38/38) in acute phase, 93.5%(29/31) in adhesion phase, and 100%(21/21) in rehabilitation phase. After treatment, the range of motion(ROM) of shoulder joint, pain, muscle force, activities of daily living(ADL) and joint local morphology of the patient have been improved obviously. Conclusion Better clinical efficacy is achieved in treatment of scapulohumeral periarthritis in different phases by combining therapy centering on FSN. 展开更多
关键词 scapulohumeral periarthritis treatment in different phases ACUPOTOMY Fu's subcutaneous needling massage functional exercise
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Externalization and internalization of cardiac endothelin receptors during different phases of sepsis in rat
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作者 王晓红 杨军 +4 位作者 董林旺 庞永政 苏静怡 唐朝枢 刘乃奎 《Chinese Medical Journal》 SCIE CAS CSCD 1999年第8期66-66,共1页
Objective To study the redistribution of ET1 receptors in two subcellular organelles, the sarcolemmal membrane and the light vesicle, of rat heart during the progress of septic shock Methods Male Sprague Dawley ... Objective To study the redistribution of ET1 receptors in two subcellular organelles, the sarcolemmal membrane and the light vesicle, of rat heart during the progress of septic shock Methods Male Sprague Dawley rats weighing from 270 to 320?g were randomly divided into three groups: control, early sepsis, and late sepsis Each group included six rats Sepsis was induced by cecal ligation and puncture (CLP) Control rats were sham operated After operation for 9 hours or 18 hours, animals of the three groups were anesthetized with sodium pentobarbital (60?mg/kg IP) and the hearts were removed for preparation of sarcolemma and light vesicle Hemodynamic parameters were determined with polygraph via femoral artery and intraventricular cannula ET1 receptor was assayed by [ 125 I] ET1 binding Results Heart rate, cardiac output and left ventricular +dp/dt max undergo biphasic changes: an increase in early phase of sepsis (9?h after CLP) followed by a decrease in late phase of sepsis (18?h after CLP) Mean arterial blood pressure and left ventricular dp/dt max remained relatively unaltered during early phase of sepsis but was decreased during late phase of sepsis Although septic rat heart exhibited biphasic cardiodynamic changes, myocardial function showed signs of progressive deterioration during the development of sepsis, as indicated by a progressive elevation of LVEDP [ 125 I] ET1 bindings to cardiac membranes exhibited a saturable process with a single component binding characteristic for all three experimental groups In sarcolemmal membrane fraction, the maximum binding capacity (B max ) calculated from scatchard plot was increased 30% ( P <0 01) during early phase of sepsis but decreased 24% ( P <0 01) during late phase of sepsis The affinity [the reciprocal of the dissociation contant (Kd)] for [ 125 I] ET1 binding in sarcolemmal membranes remained unaffected during early and late phases of sepsis In light vesicle fraction, the B max for [ 125 I] ET1 binding was decreased by 19% ( P <0 05) during early phase of sepsis but increased by 38% ( P <0 01) during late phase of sepsis The affinity for [ 125 I] ET1 binding in light vesicles was unaltered in early and late phases of sepsis It should be mentioned that the sum of Bmax of sarcolemmal and light vesicle fractions was increased by 25% ( P <0 01) during early phase of sepsis but was decreased by 17% ( P <0 01) during late phase of sepsis Conclusions These data indicated that a biphasic intracellular redistribution of ET1 receptor in the heart might contribute to the development of the initial hyperdynamic and subsequent hypodynamic state during sepsis 展开更多
关键词 Externalization and internalization of cardiac endothelin receptors during different phases of sepsis in rat
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Microstructure and Stability of Fe_(73.5) Cu_1Nb_3Si_(13.5)B_9 Alloy at Different Stages of Phase Transformation
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作者 Guiyi ZENG, Qixian BA and Hualin ZENG (Northeastern University, Shenyang 110006, China) 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2000年第2期153-154,共2页
The microstructure and the stability of Fe_73.5Cu_1Nb_3Si_13.5B_9 alloy at different stages of phase transformation were investigated through the observation of X-ray difraction and transmission electron microscopy an... The microstructure and the stability of Fe_73.5Cu_1Nb_3Si_13.5B_9 alloy at different stages of phase transformation were investigated through the observation of X-ray difraction and transmission electron microscopy and the measurement of magnetic aftereffect (MAE). It was found that the dependence of the volume fraction of amorphous phase and the MAE in the samples annealed from 450 to 700℃ on the annealing temperature is similar. 展开更多
关键词 B9 Alloy at different Stages of phase Transformation Microstructure and Stability of Fe Cu1Nb3Si SI
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Observability of Airborne Passive Location System with Phase Difference Measurements 被引量:4
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作者 邓新蒲 王强 钟丹星 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2008年第2期149-154,共6页
With a pair of antennas spaced apart, an airborne passive location system measures phase differences of emitting signals. Regarded as cyclic ambiguities, the moduli of the measurements traditionally are resolved by ad... With a pair of antennas spaced apart, an airborne passive location system measures phase differences of emitting signals. Regarded as cyclic ambiguities, the moduli of the measurements traditionally are resolved by adding more antenna elements. This paper models the cyclic ambiguity as a component of the system state, of which the observability is analyzed and compared to that of the bear- ings-only passive location system. It is shown that the necessary and sufficient observability condition for the bearings-only passive location system is only the necessary observability condition for the passive location system with phase difference measurements, and that when the system state is observable, the cyclic ambiguities can be estimated by accumulating the phase difference measurements, thereby making the observer able to locate the emitter with high-precision. 展开更多
关键词 passive location phase difference OBSERVABILITY ACCURACY
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Evaluation of the effects of EPS composite soil replacement on the dynamic performance of caisson structure using shaking table tests
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作者 Gao Hongmei Ji Zhanpeng +3 位作者 Zhang Xinlei Zhang Shushan Wang Zhihua Shen Guangming 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2024年第4期829-843,共15页
The seismic performance of a caisson structure under two types of models with a saturated sandy foundation(CSS)and an expanded polystyrene(EPS)composite soil foundation(CES)are studied using shaking table tests.The ma... The seismic performance of a caisson structure under two types of models with a saturated sandy foundation(CSS)and an expanded polystyrene(EPS)composite soil foundation(CES)are studied using shaking table tests.The macro phenomena of the two different foundation models are described and analyzed.The effects of the replacement of EPS composite soil on seismic-induced liquefaction of backfill and the dynamic performance of a caisson structure are evaluated in detail.The results show that the excess pore water pressure generation in the CES is significantly slower than that in the CSS during the shaking.The dynamic earth pressure acting on the caisson has a triangular shape.The response of horizontal acceleration,displacement,settlement,and rotation angle of the caisson in the CES is smaller than that in the CSS,which means the caisson in the CES has a better seismic performance.Furthermore,the out-of-phase phenomenon between dynamic earth thrust and inertial force in the CES is more obvious than that in the CSS,which is beneficial to reduce the lateral force and improve the stability of the caisson structure. 展开更多
关键词 EPS composite soil foundation Caisson-type quay wall shaking table test phase difference rotation angle
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Phase Difference Method for DOA Estimation 被引量:2
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作者 陈志菲 孙进才 侯宏 《Journal of Marine Science and Application》 2010年第4期445-450,共6页
The phase difference method (PDM) is presented for the direction of arrival (DOA) estimation of the narrowband source. It estimates the DOA by measuring the reciprocal of the phase range of the sensor output spectra a... The phase difference method (PDM) is presented for the direction of arrival (DOA) estimation of the narrowband source. It estimates the DOA by measuring the reciprocal of the phase range of the sensor output spectra at the interest frequency bin. The peak width and variance of the PDM are presented. The PDM can distinguish closely spaced sources with different and unknown center frequencies as long as they are separated with at least one frequency bin. The simulation results show that the PDM has a better resolution than that of the conventional beamforming. 展开更多
关键词 direction of arrival(DOA) phase difference peak width variance RESOLUTION
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The Real-Time,High Precision Phase Difference Measurement of Electron Density in HL-2A Tokamak 被引量:1
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作者 丁宝钢 吴彤宇 +2 位作者 李世平 周艳 阴泽杰 《Plasma Science and Technology》 SCIE EI CAS CSCD 2015年第9期797-801,共5页
This paper introduces a real-time high precision measurement of phase difference based on Field Programmable Gate Array(FPGA) technology,which has been successfully applied to laser grating interference measurement ... This paper introduces a real-time high precision measurement of phase difference based on Field Programmable Gate Array(FPGA) technology,which has been successfully applied to laser grating interference measurement and real-time feedback of plasma electron density in HL-2A tokamak.It can track the changes of electron density while setting the starting point of the density curve to zero.In a laboratory test,the measuring accuracy of phase difference is less than 0.1°,the time resolution is 80 ns,and the feedback delay is 180 μs. 展开更多
关键词 phase difference HL-2A FPGA REAL-TIME high precision
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ACCURACY ANALYSIS OF PASSIVE LOCATION SYSTEM WITH PHASE DIFFERENCE RATE MEASUREMENT 被引量:1
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作者 邓新蒲 姜文利 周一宇 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2000年第4期222-227,共6页
The conventional mono-station passive location techniques of direction finding are low in speed and accuracy, due to the little information available. In this paper, a novel measurement-rate (derivative) of phase diff... The conventional mono-station passive location techniques of direction finding are low in speed and accuracy, due to the little information available. In this paper, a novel measurement-rate (derivative) of phase difference from a two-element antenna array (interferometer) is introduced, accuracy of a passive location system with this measurement and directions of arrival (DOA) is analyzed, and the Cramer-Rao bound of location error of this system for 3D location is examined by simulations. 展开更多
关键词 passive location phase difference rate location accuracy analysis INTERFEROMETER
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MFPL:Multi-Frequency Phase Difference Combination Based Device-Free Localization 被引量:1
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作者 Zengshan Tian Weiqin Yang +2 位作者 Yue Jin Liangbo Xie Zhengwen Huang 《Computers, Materials & Continua》 SCIE EI 2020年第2期861-876,共16页
With the popularity of indoor wireless network,device-free indoor localization has attracted more and more attention.Unlike device-based localization where the target is required to carry an active transmitter,their f... With the popularity of indoor wireless network,device-free indoor localization has attracted more and more attention.Unlike device-based localization where the target is required to carry an active transmitter,their frequent signal scanning consumes a large amount of energy,which is inconvenient for devices with limited energy.In this work,we propose the MFPL,device-free localization(DFL)system based on WiFi distance measurement.First,we combine multi-subcarrier characteristic of Channel State Information(CSI)with classical Fresnel reflection model to get the linear relationship between the change of the length of reflection path and the subcarrier phase difference.Then we calculate the Fresnel phase difference between subcarrier pairs with different spacing from CSI amplitude time series.Finally,we get the change of the length of the reflection path caused by target moving to achieve distance measurement and localization.Using a combination of subcarriers with different spacing to achieve distance measurement effectively broadens the maximum unambiguous distance of the system.To solve the complex non-linear problem of the intersection of two elliptic equations,we introduce Newton's method to transform the non-linear problem into a linear one.The effectiveness of our approach is verified using commodity WiFi infrastructures.The experimental results show our method achieves a median error of 0.87 m in actual indoor environment. 展开更多
关键词 Indoor localization WiFi channel state information fresnel phase difference reflection path length
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The relation between the response spectrum and the phase diference spectrum 被引量:1
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作者 赵凤新 胡聿贤 《Acta Seismologica Sinica(English Edition)》 CSCD 1996年第3期13-18,共6页
The relation between the phase difference spectrum and the response spectrum is studied in this paper. It is found that the phase difference spectrum influences the response spectrum through affecting the response ... The relation between the phase difference spectrum and the response spectrum is studied in this paper. It is found that the phase difference spectrum influences the response spectrum through affecting the response motion′s envelope function shape of a single degree of freedom system. Decreasing the variance of phase difference spectrum causes the increasing of response spectrum when its mean value curve keeps the same, otherwise the situation is opposite. As the increase of the tangent of the mean value curve, the response spectrum decreases, otherwise it increases. The damping plays an important role while the phase difference spectrum influences the response spectrum. The effect of the phase difference spectrum on the absolute acceleration response spectrum becomes more and more obvious with the increase of the damping. On the other hand, the increase of damping weakens the effect of the phase difference spectrum on the amplification factor spectrum. 展开更多
关键词 ground motion response spectrum phase difference spectrum.
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Equivalent comparison and analysis between different nominal frequencies
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作者 李智奇 韦中 +2 位作者 周渭 宋慧敏 鲁伟昊 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第11期238-241,共4页
We analyze the phenomena of phase group synchronization between the different nominal frequency signals and propose a new theory of the equivalent comparison between them. The exact expression of the equivalent compar... We analyze the phenomena of phase group synchronization between the different nominal frequency signals and propose a new theory of the equivalent comparison between them. The exact expression of the equivalent comparison is deduced. High resolution frequency measurement and phase comparison can be realized using this theory with the divider. For avoiding the frequency mixing, multiplication and synthesis, the system phase noise is improved and the higher resolution comparison and measurement are achieved between the different nominal frequencies by theory. 展开更多
关键词 phase difference group synchronization equivalent comparison frequency measurement
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Effect of atomic initial phase difference on spontaneous emission of an atom embedded in photonic crystal
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作者 张冰 孙秀冬 姜向前 《Chinese Physics B》 SCIE EI CAS CSCD 2010年第8期301-306,共6页
We investigate the effect of initial phase difference between the two excited states of a V-type three-level atom on its steady state behaviour of spontaneous emission. A modified density of modes is introduced to cal... We investigate the effect of initial phase difference between the two excited states of a V-type three-level atom on its steady state behaviour of spontaneous emission. A modified density of modes is introduced to calculate the spontaneous emission spectra in photonic crystal. Spectra in free space are also shown to compare with that in photonic crystal with different relative positions of the excited levels from upper band-edge frequency. It is found that the initial phase difference plays an important role in the quantum interference property between the two decay channels. For a zero initial phase, destructive property is presented in the spectra. With the increase of initial phase difference, quantum interference between the two decay channels from upper levels to ground level turns to be constructive. Furthermore, we give an interpretation for the property of these spectra. 展开更多
关键词 initial phase difference spontaneous emission spectrum quantum interference
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Feedback Control System for Antenna Phase Difference in the LHCD Experiments
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作者 蒋敏 匡光力 +3 位作者 单家芳 林建安 孔军 HT-7 Team 《Plasma Science and Technology》 SCIE EI CAS CSCD 2005年第6期3107-3110,共4页
It is well accepted that lower hybrid current drive (LHCD) is the most efficient method for non-inductive current drive in fusion devices and the effect of the current drive is dependent on not only microwave power ... It is well accepted that lower hybrid current drive (LHCD) is the most efficient method for non-inductive current drive in fusion devices and the effect of the current drive is dependent on not only microwave power but also its grill phase shift. This paper presents a new kind of feedback control system for antenna phase difference in LHCD experiments. In this highspeed control system, a lot of new technologies and methods are incorporated. The results of the experiments show a very good agreement with the system design. 展开更多
关键词 lower hybrid current drive (LHCD) feedback control system antenna phase difference
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The statistical laws of strong seismic motion phase characteristics
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作者 金星 廖振鹏 《Acta Seismologica Sinica(English Edition)》 CSCD 1994年第1期141-147,共7页
Under the assumption of an effective point source model,this paper introduces a conception of equivalent phase velocity to describle the average propagation processes and dispersion properties of seismic waves from se... Under the assumption of an effective point source model,this paper introduces a conception of equivalent phase velocity to describle the average propagation processes and dispersion properties of seismic waves from seismic source to the site,then illuminates the relation between the phase properties of seismic motion and equivalent phase velocity and obtains a simple formula of estimating the equivalent phase velocity through the use of the phase difference spectrum of seismic motion.After the parts of strong seismic records in the western American and the SMART-1 array are used to identify the method presented by this paper in reason,the statistical relations of equivalent phase velocity are given in the above two regions.The results of the paper have demonstrated that the phase spectrum of seismic motion has its inner law as same as the amplitude spectrum does. 展开更多
关键词 equivalent phase velocity relative phase velocity phase spectrum relative group velocity phase difference spectrum
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Non-contact Acoustic Contour Imaging Method Using Phase Difference in Extremely Shallow Underground
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作者 Tsuneyoshi Sugimoto Ryo Akamatsu Touma Abe 《Journal of Energy and Power Engineering》 2012年第12期2010-2017,共8页
Buried object which exists at extremely shallow underground can be detected by using an acoustic vibration and a SLDV (scanning laser Doppler vibrometer). Non-contact acoustic exploration can be realized by using ai... Buried object which exists at extremely shallow underground can be detected by using an acoustic vibration and a SLDV (scanning laser Doppler vibrometer). Non-contact acoustic exploration can be realized by using air coupled sound. It was confirmed that discovery and the identification of a buried thing were possible using the OFR method (optimum frequency range method). However, in this method, only the amplitude of the vibration speed spectrum is used and did not use the phase information. Therefore a new imaging method is proposed that used the phase information of the vibration speed spectrum. From the experimental results, the possibility of the outline extraction by using the phase difference between each scan point is confirmed. As a future task, the phase difference image will become clearer by changing the scan point density and long duration time of emitted wave. 展开更多
关键词 phase difference non-contact acoustic exploration contour imaging scanning laser Doppler vibrometer optimumfrequency range.
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High-precision time and frequency measurement method combining time-space conversion and different frequency phase detection 被引量:4
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作者 DU BaoQiang WANG YanFeng +3 位作者 CUI GuangZhao GUO ShuTing DONG ShaoFeng LIU Dan 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2013年第11期2110-2115,共6页
According to the time&space conversion relations and different frequency phase detection principle,an ultra-high precision time&frequency measurement method is proposed in this paper.The higher accuracy and st... According to the time&space conversion relations and different frequency phase detection principle,an ultra-high precision time&frequency measurement method is proposed in this paper.The higher accuracy and stability of the speed of light and electromagnetic signals during the transmission in space or a specific medium enable the measurement of short time interval which uses the coincidence detection of signal’s transmission delay in length.The measurement precision better than 10 picoseconds can be easily obtained.The method develops the length vernier utilizing the stability of signal’s transmission delay,minimizes the fuzzy region of phase coincidence between the standard frequency signal and the measured signal,approaches the best phase coincidences and therefore improves the measurement precision which is higher than the precision provided by the traditional methods based on frequency processing.Besides,the method costs less than the traditional methods and can also solve the problem of the measurement of super-high frequency.Experimental results show the method can improve the measurement precision to 10 12/s in the time&frequency domain. 展开更多
关键词 time and space conversion delay-time phase shift different phase coincidence detection group phase difference
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TRANSVERSE VELOCITY ESTIMATION BASED ON HIGH-ORDER DOPPLER EFFECT OF MOVING OBJECT 被引量:1
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作者 张兴敢 柏业超 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2009年第3期224-228,共5页
The one-order phase of the echo changes if there is relative radial moving between the object and the radar, i.e. , the Doppler effect. The Doppler effect is widely used in radar signal processing. The transverse moti... The one-order phase of the echo changes if there is relative radial moving between the object and the radar, i.e. , the Doppler effect. The Doppler effect is widely used in radar signal processing. The transverse motion of the object cannot change the one-order phase of the echo, but the high-order phase. The high-order Doppler effect of the transverse moving target is presented and a new algorithm for obtaining the transverse velocity is given. The scalar velocity of a target moving steadily in any direction can be calculated with one-order and two-order items of the echo phase. The calculating method and simulating results are given. As the transverse speed is 900 km/h, the speed calculation error is less than 0. 06% if SNR of echo signal is higher than 0 dB. 展开更多
关键词 Doppler effect curve fitting transverse movement phase difference
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