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Although a pulsed-wave (PW) Doppler system can measure blood velocity with range information, measurable velocity is limited by frequency aliasing, and signal-noise-ratio (SNR) is poor. Continuous wave (CW) Doppler system offers a higher SNR in Doppler signal and no measurable velocity limitations but does not provide ranging information. Linear frequency-modulated continuous wave (LFMCW) and sine frequency-modulating continuous wave are able to provide high SNR Doppler signals with ranging information, and low clutter power, but with a certain range ambiguity due to signal periodicity of the Doppler signal spectrum. Various efforts have been made to improve the SNR, range resolution, and velocity limitations with FMCW Doppler system. An ultrasonic doppler blood flow velocity measurement system based on chaotic FMCW is proposed which has a higher SNR with no range ambiguity because of the aperiodicity of the Doppler signal spectrum. Principle analysis and experimental simulation show that the effectiveness of the new system is verified.
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Keywords:
- ultrasound /
- doppler /
- blood velocity /
- chaotic FMCW
[1] Wilhjelm J E, Pedersen P C 1993 Ferroelectrics, And Frequency Control 40 366
[2] Lasse Lovstakken, Hans Torp 2010 IEEE International Ultrasonics Symposium Proceedings USA, Oct. 11-14, 2010 p1198
[3] Jeremy Bercoff, Gabriel Montaldo, Thanasis Loupas, David Savery, Fabien MÉZiÉRe, Mathias Fink, Mickael Tanter 2011 IEEE Transactions On Ultrasonics, Ferroelectrics, And Frequency Control 58 134
[4] Masanori Kunita, Masamitsu Sudo, Takashi Mochizuki 2008 IEEE International Ultrasonics Symposium Proceedings USA, Nov. 2-5, 2008 p1366
[5] Cui Z Z, Song S H, Xu L X Theoty of Proximity Fuse. (Beijing: Beijing Institute of Technology Press) p68 (in Chinese) [崔占忠, 宋世和, 徐立新 2005 近炸引信原理 (北京: 北京理工大学出版社) 第68页]
[6] Masanori Kunita, Masamitsu Sudo, Shinya Inoue, Mutsuhiro Akahane 2010 IEEE Transactions On Ultrasonics, Ferroelectrics, And Frequency Control 57 p1064
[7] Lv Q, Gu H, Su W M 2010 J. Elect. Inf. Tech. 32 277 (in Chinese) [吕婧, 顾红, 苏卫民 2010 电子与信息学报 32 377]
[8] Stove A G 1992 Radar and Signal Processing, IEE Proceedings F 139 343
[9] Liu G S, Sun G M, Gu H, Zhu X H 1995 Modern. Radar. 17 (6) 20 (in Chinese) [刘国岁, 孙光民, 顾红, 朱晓华 1995 现代雷达 17(6) 20]
[10] Jiang F 2009 Ph. D. Dissertation (Nanjing: Nanjing University of Science and Technology) (in Chinese) [蒋飞 2009 博士学位论文 (南京: 南京理工大学)]
[11] Yu S M 2011 Chaotic Systems and Chaotic Circuits: Principle, Design and Its Application in Communications (Xi'an: Xi Dian University Press) p113 (in Chinese) [禹思敏 2011 混沌系统与混沌电路-原理、设计及其在通信中的应用 (西安: 西安电子科技大学出版社) 第113页]
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[1] Wilhjelm J E, Pedersen P C 1993 Ferroelectrics, And Frequency Control 40 366
[2] Lasse Lovstakken, Hans Torp 2010 IEEE International Ultrasonics Symposium Proceedings USA, Oct. 11-14, 2010 p1198
[3] Jeremy Bercoff, Gabriel Montaldo, Thanasis Loupas, David Savery, Fabien MÉZiÉRe, Mathias Fink, Mickael Tanter 2011 IEEE Transactions On Ultrasonics, Ferroelectrics, And Frequency Control 58 134
[4] Masanori Kunita, Masamitsu Sudo, Takashi Mochizuki 2008 IEEE International Ultrasonics Symposium Proceedings USA, Nov. 2-5, 2008 p1366
[5] Cui Z Z, Song S H, Xu L X Theoty of Proximity Fuse. (Beijing: Beijing Institute of Technology Press) p68 (in Chinese) [崔占忠, 宋世和, 徐立新 2005 近炸引信原理 (北京: 北京理工大学出版社) 第68页]
[6] Masanori Kunita, Masamitsu Sudo, Shinya Inoue, Mutsuhiro Akahane 2010 IEEE Transactions On Ultrasonics, Ferroelectrics, And Frequency Control 57 p1064
[7] Lv Q, Gu H, Su W M 2010 J. Elect. Inf. Tech. 32 277 (in Chinese) [吕婧, 顾红, 苏卫民 2010 电子与信息学报 32 377]
[8] Stove A G 1992 Radar and Signal Processing, IEE Proceedings F 139 343
[9] Liu G S, Sun G M, Gu H, Zhu X H 1995 Modern. Radar. 17 (6) 20 (in Chinese) [刘国岁, 孙光民, 顾红, 朱晓华 1995 现代雷达 17(6) 20]
[10] Jiang F 2009 Ph. D. Dissertation (Nanjing: Nanjing University of Science and Technology) (in Chinese) [蒋飞 2009 博士学位论文 (南京: 南京理工大学)]
[11] Yu S M 2011 Chaotic Systems and Chaotic Circuits: Principle, Design and Its Application in Communications (Xi'an: Xi Dian University Press) p113 (in Chinese) [禹思敏 2011 混沌系统与混沌电路-原理、设计及其在通信中的应用 (西安: 西安电子科技大学出版社) 第113页]
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