Title :
A Modified LFM Signal in Coded Ultrasound
Author :
Jin Cheng ; Chen Si-ping
Author_Institution :
Coll. of Biomed. Eng. & Instrum. Sci., Zhejiang Univ., Hangzhou
Abstract :
The linear nature of linear frequency modulation (LFM) waveform makes it rather insensitive to frequency shifts, a property which is of great importance in ultrasound imaging. However, relatively high sidelobes remain in the autocorrelation function (ACF). A modified FLM waveform is proposed by combining LFM with binary frequency code. This waveform maintains the linear nature of LFM and at same time low sidelobos are exhibited. Simulated results show the relation between the sidelobes reduction with the amplitude of the binary frequency code.
Keywords :
biomedical ultrasonics; correlation methods; frequency modulation; image coding; medical image processing; FLM waveform; LFM signal; autocorrelation function; binary frequency code; biomedical ultrasonics; linear frequency modulation; sidelobe reduction; ultrasound image coding; Autocorrelation; Bandwidth; Biomedical engineering; Biomedical imaging; Chirp modulation; Educational institutions; Frequency; Radar imaging; Shape control; Ultrasonic imaging; Ambiguity function; Coded ultrasound; LFM; Sidelobes;
Conference_Titel :
Future BioMedical Information Engineering, 2008. FBIE '08. International Seminar on
Conference_Location :
Wuhan, Hubei
Print_ISBN :
978-0-7695-3561-6
DOI :
10.1109/FBIE.2008.86
