Title :
Considerations in measuring vital signs cross section with Doppler radar
Author :
Kiriazi, John E. ; Boric-Lubecke, Olga ; Lubecke, Victor M.
Author_Institution :
Univ. of Hawaii at Manoa, Honolulu, HI, USA
Abstract :
This paper describes the different considerations and challenges in measuring human cardiopulmonary radar cross section (RCS). The effect of clutter on the received signal is explained as well as the importance of preserving baseband dc content for valid readings. The center estimation algorithm with dc-cancellation is presented as a solution to restore dc content in the baseband signals and to exclude clutter contribution. The far-field conditions for the target range are revisited. By modeling the human torso as a half-cylinder and assuming unity reflectivity, the ratio of the RCS of the back of the torso with respect to the front is a function of wavelength. At 2.4 GHz and for a chest breadth of 30 cm, the back is expected to have an RCS that is 10 times that of the front while the RCS of the side is expected to be 4 times smaller.
Keywords :
Doppler radar; estimation theory; radar clutter; radar cross-sections; radar signal processing; remote sensing by radar; baseband DC content; distance 30 cm; doppler radar; estimation algorithm; frequency 2.4 GHz; human cardiopulmonary measurement; radar cross section; Baseband; Cardiology; Clutter; Doppler radar; Humans; Radar cross section; Torso; Clutter; Doppler radar; radar cross section; radar remote sensing; radar signal processing;
Conference_Titel :
Radio and Wireless Symposium (RWS), 2011 IEEE
Conference_Location :
Phoenix, AZ
Print_ISBN :
978-1-4244-7687-9
DOI :
10.1109/RWS.2011.5725515