Abstract
AbstractThe low peak power of FMCW radar is attractive for application to various fields, such as vehicle collision warning systems and airborne radio altimeters. This paper describes a sonar system to provide ultrasound cross‐sectional images for diagnosis based on the same principle as the FMCW radar. Adoption of the sawtooth waveform is proposed for FM modulation to attain sufficient range resolution. The baseband received signal is analytically estimated to calculate the spectrum and range resolution. The calculation results suggest that the sonar system has similar range resolution to conventional pulse sonars, whose instantaneous power has a very high peak.The theoretically estimated spectrum also suggests that the FMCW sonar system operates well in the case of simultaneous acceptance of reflected signals from multiple points because its excellent range resolution enables distinguishing the contributions from different reflection points.The calculation results are verified by an experiment in which an electric delay line is used instead of human tissue to avoid ambiguity caused by unexpected reflection points in the measuring setup. © 2006 Wiley Periodicals, Inc. Electron Comm Jpn Pt 3, 90(1): 9–19, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecjc.20244
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
