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Bioradiolocation
Bioradiolocation is a method for the remote detection and diagnostics of biological objects by means of radar, even behind optically opaque obstacles.〔F. Soldovieri, I. Catapano, L. Crocco, L.N. Anishchenko, and S.I. Ivashov, "A Feasibility Study for Life Signs Monitoring via a Continuous-Wave Radar", International Journal of Antennas and Propagation, vol. 2012, Article ID 420178, 5 pages, 2012.〕〔Hui Xu, Bangyu Li, Xinsheng Che, and Jian Ren, Analyzing the Effect and Selecting the Parameter of Bioradar Antenna for Measurement // Communications in Computer and Information Science Volume 176, 2011, pp 451-456.〕 Devices based on this method are called bioradars.〔Fu Rui-ling, Li Hongxia, Application of Adaptive Spectral-line Enhancer in Bioradar // Proc. Of 2011 International Conference on Computer and Automatic Engineering, 2011, pp.121-125.〕
==Theoretical basis==
This method is based on the reflected signal modulation caused by movements of the human body and internal organs. While the examinee maintains a calm state (e.g. is sleeping or sitting in a fixed pose) modulation of the bioradar signal is caused mainly by respiratory movements (0.2-0.5 Hz) and heart and superficial arteries pulsations (0.7-1.5 Hz). The amplitude of thorax surface displacement caused by respiratory muscles contractions is about 1 cm, while the same parameter for heart beating is only 1 mm. The order of registered parameters determines the usage of microwave frequency band. Impulse,〔Immoreev, I.Y., "Practical applications of UWB technology", Aerospace and Electronic Systems Magazine, IEEE , vol.25, no.2, pp.36,42, Feb. 2010.〕〔Jing Li, Lanbo Liu, Zhaofa Zeng, Fengshan Liu, "Simulation and signal processing of UWB radar for human detection in complex environment", Ground Penetrating Radar (GPR), 2012 14th International Conference on , vol., no., pp.209,213, 4–8 June 2012.〕 linearly〔Fu-Kang Wang, Tzyy-Sheng Horng, Kang-Chun Peng, Je-Kuan Jau, Jian-Yu Li, Cheng-Chung Chen, "Detection of Concealed Individuals Based on Their Vital Signs by Using a See-Through-Wall Imaging System With a Self-Injection-Locked Radar", Microwave Theory and Techniques, IEEE Transactions on , vol.61, no.1, pp.696,704, Jan. 2013.〕 or step-frequency 〔Otsu M., Nakamura R., Kajiwara A., "Remote respiration monitoring sensor using stepped-FM", Sensors Applications Symposium (SAS), 2011 IEEE , pp.155,158, 22-24 Feb. 2011.〕 modulated and monochromatic 〔S.I. Ivashov, V.V. Razevig, A.P. Sheyko, I.A. Vasilyev, "Detection of Human Breathing and Heartbeat by Remote Radar", Progress in Electromagnetics Research Symposium (PIERS 2004), March 28–31, 2004, Pisa, Italy, pp. 663-666.〕 signals can be used as probing ones.
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