Presentation	1995/10/20 Doubly Apodized Linear FM Chirp Signal and its Applications Y Takeuchi,
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Abstract(in English)	Spread spectrum (SS) signals have been widely applied, not only for communication or cryptography but also for echo sounding for ranging or imaging. In this case range (or time) sidelobe level of the signaling design vastly determines the quality of the measurement or the obtained image. Here presented a family of doubly apodized linear chirp signals having -100dB or less autocorrelation sidelobe, found by author, during years of study of SS signals application for medical ultrasound echpgraphic imagers, in terms of insonification safety as well as detection performance. The signal has extra gaussian apodization upon well known cosine-square apodized linear chirp. Its autocorrelation sidelobe diminishes to less than -100dB range, for example, when chirp over 1:2 frequency range with 100 wavelength. This is virtually equivalent sidelobe performance as Golay code or complementary code family, yet having essential pulse to pulse Doppler-shift tolerance.
Keyword(in Japanese)	(See Japanese page)
Keyword(in English)	Linear-chirp
Paper #	SST95-89
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Conference Information
Committee	SST
Conference Date	1995/10/20(1days)
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Paper Information
Registration To	Spread Spectrum Technology (SST)
Language	JPN
Title (in Japanese)	(See Japanese page)
Sub Title (in Japanese)	(See Japanese page)
Title (in English)	Doubly Apodized Linear FM Chirp Signal and its Applications
Sub Title (in English)
Keyword(1)	Linear-chirp
1st Author's Name	Y Takeuchi
1st Author's Affiliation	R&D, GE-Yokogawa Medical Systems, Ltd.()
Date	1995/10/20
Paper #	SST95-89
Volume (vol)	vol.95
Number (no)	303
Page	pp.pp.-
#Pages	4
Date of Issue