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Relevant bibliographies by topics / Doppler spread

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Academic literature on the topic 'Doppler spread'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 June 2025

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Journal articles on the topic "Doppler spread"

1

Benani, Abdelmoumen, Andre Carr, and Martin Quenneville. "Doppler spread technique." IEEE Vehicular Technology Magazine 4, no. 1 (March 2009): 78–86. http://dx.doi.org/10.1109/mvt.2008.931621.

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Dang, Qun, and Xiao Li Lei. "Doppler Frequency Shift Tolerance Extension in Burst Spread Spectrum Communication System." Advanced Materials Research 443-444 (January 2012): 237–40. http://dx.doi.org/10.4028/www.scientific.net/amr.443-444.237.

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A method to extend Doppler frequency discrimination tolerance is proposed for quick acquirement PN-code and Doppler frequency in TDMA burst spread spectrum communication system. According to Doppler’s different impacts on the correlation Peak and data demodulation, PN-code is acquired through single channel matched-filters, and parallel multi-channel correlators are used in the data demodulation branch channel. Thus, with using frame head prior information in data channel instead of traditional Cross-Product Automatic Frequency Control (CPAFC), the Doppler frequency shift discrimination tolerance is extended. Simulation and experiment show that frequency and PN-code can be acquired in several data periods, and synchronous time and the resources consumption are effectively reduced.

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Bu, Linsheng, Wanyu Chang, Defeng Chen, and Tuo Fu. "Deep learning-based Doppler-spread target detection with attention mechanism." Journal of Physics: Conference Series 2906, no. 1 (November 1, 2024): 012023. https://doi.org/10.1088/1742-6596/2906/1/012023.

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Abstract In radar systems, Doppler spread issues commonly arise in space small target detections when integration is adopted during a long coherent processing interval (CPI). Even with precise compensation for translational effects, phase variations introduced by changes in target observation attitudes (TOA) can still cause the target’s echo energy to spread across multiple Doppler cells. As the TOA undergoes several periods over a CPI, the echo energy disperses into equidistant Doppler cells within a range cell in the range-Doppler (RD) map, which poses challenges for traditional methods and results in degraded detection performance. Leveraging the convolutional neural network’s ability to autonomously extract data features, we propose a neural network based on the Doppler auto-correlation attention mechanism (DAAM) to enhance detection accuracy and precisely estimate target positions by exploiting the sparse characteristics of the target Doppler spectrum. Training and testing are conducted using an RD map dataset, and experimental results demonstrate the network’s advanced performance in both target detection and position estimation.

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Krasny, L., H. Arslan, D. Koilpillai, and S. Chennakeshu. "Doppler spread estimation in mobile radio systems." IEEE Communications Letters 5, no. 5 (May 2001): 197–99. http://dx.doi.org/10.1109/4234.922758.

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Howard, S. J., and K. Pahlavan. "Doppler spread measurements of indoor radio channel." Electronics Letters 26, no. 2 (1990): 107. http://dx.doi.org/10.1049/el:19900074.

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KO, Y. C. "Doppler Spread Estimation in Mobile Communication Systems." IEICE Transactions on Communications E88-B, no. 2 (February 1, 2005): 724–28. http://dx.doi.org/10.1093/ietcom/e88-b.2.724.

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Hines, Colin O. "The Doppler spread theory and parameterization revisited." Journal of Atmospheric and Solar-Terrestrial Physics 66, no. 11 (July 2004): 949–56. http://dx.doi.org/10.1016/j.jastp.2004.02.005.

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Zhang, Yan, Zunwen He, Wancheng Zhang, Limin Xiao, and Shidong Zhou. "Measurement-Based Delay and Doppler Characterizations for High-Speed Railway Hilly Scenario." International Journal of Antennas and Propagation 2014 (2014): 1–8. http://dx.doi.org/10.1155/2014/875345.

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This paper presents results for delay and Doppler spread characterization in high-speed railway (HSR) hilly scenario. To investigate the propagation characteristics in this specific terrain, a measurement campaign is conducted along the “Guangzhou-Shenzhen” HSR in China. A wideband channel sounder with 40 MHz bandwidth is used to collect raw data at 2.4 GHz band. The delay spread and Doppler frequency features are analyzed based on measured data. It is found that there are abundant multipath components (MPCs) in this scenario. We present the relationship between the delay spreads and the transceiver distances. The measured route can be divided into four areas with different delay and Doppler characteristics. Finally, a tapped delay line (TDL) model is proposed to parameterize the channel responses in the HSR hilly environment, which is supposed to provide criterions for evaluations of the radio interface and development of wireless communication system.

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Bhadouria, Vijay Singh, Monika Agrawal, and Ritesh Kumar. "An unsupervised clustering-based scale-lag receiver design approach for the doubly selective underwater acoustic channel." Journal of the Acoustical Society of America 152, no. 1 (July 2022): 342–53. http://dx.doi.org/10.1121/10.0012349.

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This paper details the architecture of a novel scale-lag rake receiver for the doubly selective underwater acoustic (UWA) channel. The shallow UWA channel is known to have a large Doppler spread. The cause of this is primarily due to the large spread of the angle of arrival of the received signal's paths. The Doppler scale value is dependent on the angle of arrival of the received signal. The Doppler spread is significant, and multiple Doppler scales are present in the UWA channel. Therefore, the receivers operating with only a single Doppler scale compensation perform sub-optimally. The optimal receiver should incorporate all possible Doppler scales for better performance. The receiver needs to have multiple sampling rates to incorporate all Doppler scales. It is usually done by having multiple receive channels, one for each sampling rate. It requires tremendous resources as its complexity increases exuberantly. This paper shows that these Doppler scales are clustered and that an optimal receiver is implemented using fewer receiver channels, each corresponding to one such cluster. It reduces the receiver's complexity. The simulation results demonstrate that using the Doppler scale value associated with the path of the highest magnitude per cluster yields the best performance.

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Rice, Joseph, Paul Baxley, Homer Bucker, Richard Shockley, Dale Green, John Proakis, and John Newton. "Doppler spread in an undersea acoustic transmission channel." Journal of the Acoustical Society of America 103, no. 5 (May 1998): 2782. http://dx.doi.org/10.1121/1.422266.

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Dissertations / Theses on the topic "Doppler spread"

1

Eggen, Trym H. 1963. "Underwater acoustic communication over Doppler spread channels." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/42768.

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Malachias, Nickolaos. "Doppler shift and spread study for ionospherically propagated signals." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1994. http://handle.dtic.mil/100.2/ADA284610.

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Wen, Hui. "Comparison and Evaluation of Doppler Spread Estimation Algorithms in WCDMA." Thesis, KTH, Kommunikationsteori, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-152226.

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In a WCDMA transmission systems, the properties of the radio transmissionchannels can be strongly aected by the movement of User Equipment (UE) orthe surrounding objects. The estimation of Doppler spread is therefore of greatimportance since it is closely related to the mobile speed, as it can also be usedto characterize the fast fading in the radio channel. Thus the Doppler spread estimation can have wide range of applications and the relative research on thistopic has drawn much attention. Many Doppler spread estimation algorithms has been proposed in the literature. In this report, these algorithms are divided into four categories, and the comparison is performed from both performanceand implementation point of view to compare these four types of estimators. During the investigation, the Rayleigh fading and Rician fading model withdierent mobile speed and SNR are simulated to analyze the performance of estimation algorithms under dierent conditions. The effect of Rician factor and angle of arrival of Line Of Sight (LOS) component is also taken into consideration in the evaluation. Furthermore, the computational complexity of each algorithm is calculated. Based on simulation results, the underlying reasons for their performances are analyzed individually. The Moser's estimator (correlation based estimator) demonstrates the best performance among these four estimators from the perspective of estimation accuracy. And it also shows the great value for the implementation in real systems.<br>I ett kommunikationssystem baserat p WCDMA kan egenskaperna hos radiotransmissionskanalernapverkas starkt av mobilens eller omgivningens rrelser.Estimering av Doppler spridningen r drfr av stor betydelse eftersom den r nrabeslktad med mobilens hastighet och den kan ocks anvndas fr att karakteriseraden snabba fdning i radiokanalen. Sledes kan estimat av Dopplerspridning ha ettbrett anvndningsomrde och forskningen om detta mne har varit intesiv. Mngaalgoritmer fr estimatering av Doppler spridning har freslagits i litteraturen. Idenna rapport, dessa algoritmer r indelade i fyra kategorier och analysen utfrsbde med avseende p prestanda och implementerbarhet. Simuleringar r utfrdamed Rayleigh fading och Rician modeller med olika hastigheter hos mobilen,och olika signal till brus frhllanden. Simuleringar har ocks gjorts fr olika vrdenav Ricianfaktorn och vinkel fr inkommande signal. Vidare har den berkningsmssigakomplexiteten av varje algoritm analyserats. Utifrn simuleringsresultathar de bakomliggande orsakerna till de olika algoritmernas prestatandadiskuterats. Dopplerspridningsestimat med Mosers metod (korrelation baseradestimator) visar det bsta resultatet bland dessa fyra estimator med avseendep skattningsnoggrannhet. Denna metod har ven frhllandevis lg berkningskomplexitetvilket gr den implementeringsvnlig.

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Fofanah, Ibrahim, and Wannaw Assegu. "Delay Spread Characterization of the Aeronautical Channel." International Foundation for Telemetering, 2012. http://hdl.handle.net/10150/581653.

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ITC/USA 2012 Conference Proceedings / The Forty-Eighth Annual International Telemetering Conference and Technical Exhibition / October 22-25, 2012 / Town and Country Resort & Convention Center, San Diego, California<br>Radio transmission channel influences greatly the quality of transmitted voice and data signal in terms of data rate and robustness. This degradation is as a result of many factors, notable amongst them are having multiple replica of the transmitted signal at the receiver (multipath), changes of frequency as a result of the movement of the aircraft (Doppler shift) and noise. This paper characterizes the scattered components of the aeronautical channel in terms of delay spread. Geometric representation is used to derive expressions for the maximum delay spread using the 2-ray model and the three dimensional model of the scattered path. Furthermore, the delay and Doppler frequencies are described as a function of the horizontal distance to the specular reflection point between a ground station and a test article. The simulated results are compared to measured data of related articles and the value of the maximum delay spread is compared with the proposed intersymbol guard band for Orthogonal Frequency Division Multiplexing (OFDM) in the Integrated Network Enhanced Telemetry (iNET) program to see if this proposition can be adapted to the aeronautical channel.

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Peng, Ziqi. "Performance and Complexity Comparison of Doppler Spread Estimation for WCDMA Systems." Thesis, KTH, Kommunikationsteori, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-152225.

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In cellular communication systems, the estimation of Doppler spread has a wide range of applications such as handoff, channel assignment scheme, adaptivetransmission, power control, etc. A great quantity of Doppler spread estimation algorithms have been proposed in the literature. But there has been few investigations which gives a comprehensive comparison of these algorithms. Therefore, it is of great signicance to compare and evaluate the performance of the existing algorithms in the same simulation framework. In this report, the uplink of WCDMA is considered. Four different types of Doppler spread estimation algorithms are evaluated and compared in a link level baseband simulator. The performance and the ability to implement are considered as the metrics for evaluation. Both Rayleigh and Rician fading channel model are applied, and the effect of speed, signal to noise ratio, Rician factor and the angle of arrived line of sight component are also tested. Moreover, the computational complexity is analysed to evaluate the practical value for implementation.<br>Estimatering av en mobils hastighet i form av Dopplerspridning har ett brett spektrum av tillmpningar i cellulra kommunikationssystem ssom fr yttningen avmobiler mellan celler, kanaltilldelningsschema, adaptiv sndning, eektstyrning,etc. En stor mngd algoritmer fr estimering av Dopplerspriding har frslagitsi litteraturen, men det r ovanligt med heltckande jmfrelser mellan med dessaalgoritmer. Drfr r det av stor betydelse att jmfra och utvrdera resultaten avbentliga algoritmer inom ramen fr samma simuleringsvertyg.I denna rapport anvnds upplnken fr WCDMA fr utvrdering av fyra olikatyper av algoritmer fr estimering av Dopplerspridning. Metriker fr utvrderingenr prestanda och implementeringsvnlighet. Bde Rayleigh och Rician fdningskanalmodeller har utvrderas, samt eekten av mobilens hastighet, signaltill brus frhllande, Rician faktor och infallsvinkel i ppet flt scenario. Dessutomhar den berkningsmssiga komplexiteten analyseras fr att utvrdera den praktiskaanvndbarheten i riktiga system.

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Scaife, Bradley J. "DOPPLER SHIFTED SPREAD SPECTRUM CARRIER RECOVERY USING REAL-TIME DSP TECHNIQUES." International Foundation for Telemetering, 1998. http://hdl.handle.net/10150/607365.

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International Telemetering Conference Proceedings / October 26-29, 1998 / Town & Country Resort Hotel and Convention Center, San Diego, California<br>In any satellite communication, the Doppler shift associated with the satellite’s position and velocity must be calculated in order to determine the carrier frequency. If the satellite state vector is unknown then some estimate must be formed of the Doppler-shifted carrier frequency. One elementary technique is to examine the signal spectrum and base the estimate on the dominant spectral component. If, however, the carrier is spread (as in most satellite communications) this technique may fail unless the chip rate-to-data rate ratio (processing gain) associated with the carrier is small. In this case, there may be enough spectral energy to allow peak detection against a noise background. In this paper, we present a method to estimate the frequency (without knowledge of the Doppler shift) of a spread-spectrum carrier assuming a small processing gain and binary-phase shift keying (BPSK) modulation. Our method relies on a simple, averaged discrete Fourier transform along with peak detection. We provide simulation results indicating the accuracy of this method. In addition, we will describe an all-digital hardware design based around a Motorola DSP56303 and high-speed A/D which implements this technique in real-time. The hardware design is to be used in NMSU’s implementation of NASA’s demand assignment, multiple access (DAMA) service.

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Landon, David. "DOPPLER BANDWIDTH CHARACTERIZATION OF ARTM CHANNEL SOUNDING DATA." International Foundation for Telemetering, 1999. http://hdl.handle.net/10150/608760.

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International Telemetering Conference Proceedings / October 25-28, 1999 / Riviera Hotel and Convention Center, Las Vegas, Nevada<br>Data from ARTM channel sounding test flights is examined to characterize the dynamic channel behavior of aeronautical telemetry channels. The dynamic behavior is characterized using the Doppler power spectrum. The width of the Doppler power spectrum is the Doppler bandwidth of the channel which indicates the required bandwidth of adaptive detection techniques such as adaptive equalization, adaptive modulation, adaptive channel selection and adaptive error control coding. Data collected from ARTM Flight 11 suggest a Doppler bandwidth exceeding 6.7 Hz for the channel, but greater accuracy and resolution will only be possible with more data.

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Widodo, Slamet. "Wind and Doppler Shift Compensation for Spread Spectrum Sound-based Positioning System." Kyoto University, 2013. http://hdl.handle.net/2433/180518.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(農学)<br>甲第17901号<br>農博第2024号<br>新制||農||1017(附属図書館)<br>学位論文||H25||N4797(農学部図書室)<br>30721<br>京都大学大学院農学研究科地域環境科学専攻<br>(主査)教授近藤直, 准教授小川雄一, 教授飯田訓久<br>学位規則第4条第1項該当

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Jian-zhong, Qi, Gong Yan, and Song Peng. "Realization of Fast Acquisition for Spread Spectrum Signal Based on FFT." International Foundation for Telemetering, 2011. http://hdl.handle.net/10150/595763.

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ITC/USA 2011 Conference Proceedings / The Forty-Seventh Annual International Telemetering Conference and Technical Exhibition / October 24-27, 2011 / Bally's Las Vegas, Las Vegas, Nevada<br>Acquisition based on Fast Fourier Transform (FFT) can acquire Pseudo-random code phase quickly and improve the performance of the satellite navigation receivers. In the paper Real-time receiver adopts the FPGA to realize the function of FFT and uses DSP processor to control the implementation process of Acquisition. For increasing the sensitivity of Acquisition incoherent accumulation were used in the process. Also, in the paper we have discussed the process method for decreasing the negative influence of signal power changes and carrier's Doppler frequency.

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Landon, David. "PARAMETRIC ESTIMATION OF THE SCATTERING FUNCTION FOR ARTM CHANNEL SOUNDING DATA." International Foundation for Telemetering, 2000. http://hdl.handle.net/10150/608249.

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International Telemetering Conference Proceedings / October 23-26, 2000 / Town & Country Hotel and Conference Center, San Diego, California<br>Parameterized data from ARTM channel sounding test flights are used to derive a parameter-based estimate of the scattering function. The Doppler bandwidth and Doppler spread, important measures of channel dynamics, can be estimated from such a scattering function. Data collected from ARTM Flight 11 suggest that the Doppler bandwidth is larger than 6.7 Hz. Even for very small collections of parameterized data, surprising agreement is shown to non-parametric scattering function estimates. This confirms modeling assumptions and offers a way to achieve significant reductions of storage requirements.

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Books on the topic "Doppler spread"

1

Eggen, Trym H. Underwater acoustic communication over Doppler spread channels. Woods Hole, Mass: Woods Hole Oceanographic Institution, 1997.

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2

Malachias, Nickolaos. Doppler shift and spread study for ionospherically propagated signals. Monterey, Calif: Naval Postgraduate School, 1994.

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3

National Institute of Standards and Technology (U.S.), ed. Characterization of a residential fire sprinkler using phase Doppler interferometry. Gaithersburg, MD: U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 2000.

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Book chapters on the topic "Doppler spread"

1

Weik, Martin H. "Doppler spread." In Computer Science and Communications Dictionary, 454. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_5520.

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Welch, Thad B., and Rodger E. Ziemer. "Simulation of a DSSS/MCM System in a Doppler Spread Channel." In Multi-Carrier Spread-Spectrum, 219–26. Boston, MA: Springer US, 1997. http://dx.doi.org/10.1007/978-1-4615-6231-3_26.

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Nagai, N., M. Okada, M. Saito, and H. Yamamoto. "Array Antenna Assisted Doppler Spread Compensator with Vehicle Speed Estimator for OFDM Receiver." In Multi-Carrier Spread-Spectrum, 299–306. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-94-017-0502-8_34.

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Okada, Minoru, Hideaki Takayanagi, and Heiichi Yamamoto. "Array Antenna Assisted Doppler Spread Compensator for OFDM." In Multi-Carrier Spread-Spectrum & Related Topics, 337–44. Boston, MA: Springer US, 2002. http://dx.doi.org/10.1007/978-1-4757-3569-7_36.

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Robertson, Patrick, and Stefan Kaiser. "Doppler Spread Analysis and Simulation for Multi-Carrier Mobile Radio and Broadcast Systems." In Multi-Carrier Spread Spectrum & Related Topics, 279–86. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/978-1-4615-4463-0_32.

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Ziemer, Rodger E., and Thaddeus B. Welch. "MCM-DSSS with DPSK Modulation and Equal Gain Combining in Delay and Doppler-Spread Rician Fading." In Multi-Carrier Spread Spectrum & Related Topics, 99–108. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/978-1-4615-4463-0_11.

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Jeong, Haeseong, and Heung-Gyoon Ryu. "Efficient Doppler Spread Compensation with Frequency Domain Equalizer and Turbo Code." In Communications in Computer and Information Science, 9–18. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-27186-1_2.

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Manzini, E., N. A. McFarlane, and C. McLandress. "Middle Atmosphere Simulations with the ECHAM4 Model: Sensitivity to the Doppler Spread Gravity Wave Parameterization." In Gravity Wave Processes, 367–81. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-642-60654-0_25.

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Mayr, Hans G., J. G. Mengel, C. O. Hines, K. L. Chan, and N. F. Arnold. "Modeling the Seasonal Cycles and Equatorial Oscillations with a Parameterization of the Doppler Spread Gravity Wave Theory." In Gravity Wave Processes, 257–74. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-642-60654-0_18.

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McFarlane, N., C. McLandress, and S. Beagley. "Seasonal Simulations with the Canadian Middle Atmosphere Model: Sensitivity to a combination of orographic and Doppler Spread Parameterizations of Gravity Wave Drag." In Gravity Wave Processes, 351–66. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-642-60654-0_24.

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Conference papers on the topic "Doppler spread"

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Gao, Ziqiang, Xiong Deng, Xihua Zou, Hongyu Meng, Lianshan Yan, and Wei Pan. "System Model of OTFS Over Joint Random and Deterministic Doppler Spread Channels." In 2024 IEEE International Conference on Communications Workshops (ICC Workshops), 396–401. IEEE, 2024. http://dx.doi.org/10.1109/iccworkshops59551.2024.10615822.

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Xiu, Xian, Xueli Sheng, Chenyang Cai, Yang Yu, and Cong Liu. "Under-Ice Delay-Doppler Doubly Spread Acoustic Channel Estimation Based on Compressed Sensing." In 2024 OES China Ocean Acoustics (COA), 1–5. IEEE, 2024. http://dx.doi.org/10.1109/coa58979.2024.10723715.

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"Session TA2b: Communications under doppler spread." In 2010 44th Asilomar Conference on Signals, Systems and Computers. IEEE, 2010. http://dx.doi.org/10.1109/acssc.2010.5757560.

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Gao Yuan, Chen Wei, Xie Tao, and Long Biqi. "Doppler spread estimation for nonRayleigh fading channel." In 2009 4th IEEE Conference on Industrial Electronics and Applications (ICIEA). IEEE, 2009. http://dx.doi.org/10.1109/iciea.2009.5138373.

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Yudnikov, Alexander, Dmitriy Zabirov, Vladimir Lyashev, and Mikhail Kirichenko. "Doppler Spread Impact Minimization via Terminal Sensors Usage." In 2020 IEEE International Black Sea Conference on Communications and Networking (BlackSeaCom). IEEE, 2020. http://dx.doi.org/10.1109/blackseacom48709.2020.9234964.

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Cao, Mingzheng, Hongya Ge, Hong Zhang, and Ali Abdi. "Parametric Doppler Spread Estimation in Mobile Fading Channels." In MILCOM 2007 - IEEE Military Communications Conference. IEEE, 2007. http://dx.doi.org/10.1109/milcom.2007.4455007.

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Gomes and Barroso. "Time-reversed communication over Doppler-spread underwater channels." In IEEE International Conference on Acoustics Speech and Signal Processing ICASSP-02. IEEE, 2002. http://dx.doi.org/10.1109/icassp.2002.1005280.

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Gomes, Joao, and Victor Barroso. "Time-reversed communication over Doppler-spread underwater channels." In Proceedings of ICASSP '02. IEEE, 2002. http://dx.doi.org/10.1109/icassp.2002.5745242.

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Tao, Jun, Jingxian Wu, and Chengshan Xiao. "Doppler Spread Estimation for Broadband Wireless OFDM Systems." In IEEE GLOBECOM 2007-2007 IEEE Global Telecommunications Conference. IEEE, 2007. http://dx.doi.org/10.1109/glocom.2007.545.

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DELVE, TJ, and PR ATKINS. "EFFECTS OF DOPPLER SHIFT IN SPREAD SPECTRUM ACQUISITION." In Underwater Acoustic Communication 1993. Institute of Acoustics, 2024. http://dx.doi.org/10.25144/20695.

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Reports on the topic "Doppler spread"

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Tanthapanichakoon, Wiwut. Development of phase doppler anemometer for measuring velocity and size distribution of paticulate materials. Chulalongkorn University, 2004. https://doi.org/10.58837/chula.res.2004.72.

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Particle size analysis is an essential analytical task in a large variety of processes of industrial and laboratorial relevance. Phase doppler anemometer (PDA) is one of well-established techniques allowing simultaneous measurement of velocity and size of particles, droplets, or bubbles in two-phase flows including spray atomization. The method is based upon the principle of light scattering interferometry. When a particle passes through the probe volume defined by the intersection of two laser beams, the phase of the light scattered by the particle carries information about the particle size, whereas its frequency provides the information of particle velocity. This research work has been devoted to the development of a one-dimensional PDA instrument by using He-Ne laser with wavelength of 632.8 nm and two detectors for measuring velocity and size distribution of water droplets generated by binary and ultrasonic nozzles. The calibration of the developed PDA with the transparent glass spheres of precisely known size was conducted before investigating the reliability and accuracy of the developed system by comparing the measurement results obtained from the developed with that of the commercial PDA instruments. It was found that the relative difference of the droplet mean velocity and diameter measured by the developed system were less than 15% and 25% respectively. These results demonstrate the potential of the PDA instrument developed in this work.

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