![]() ![]() The phase of the reflected waves differs from the original phase because of the object’s (chest) movement. The Doppler radar transmitter emits a continuous-wave (CW) signal in a specific direction to free space, while the receiver detects a reflected wave from the human-chest plane due to breathing. The Doppler radar technique is commonly used for the detection of the human respiratory rate (breathing). Results demonstrated improved accuracy compared to that of other approaches, such as direct-contact sensors and optical cameras. The authors in suggested a radar device designed to detect the pulse and breathing of human beings from a distance of 30 m. As a consequence, it provides a more practical and safe method for carrying out the patient’s examination, especially in some particular conditions where the patient cannot be touched (e.g., burn wounds). In fact, radar technology is very useful for medical instruments, as it can provide nonphysical contact between patient and examination unit. Many research works in the healthcare sector focused on detecting the function of vital human organs, such as the lungs and heart, as they are essential health indicators. ![]() We also emphasize that the designed radar system can be used as a portable device which offers flexibility to be used anytime and anywhere.įor the past few decades, the medical field has utilized radar systems, such as for tumor detection, breath monitoring, heartbeat monitoring, and the detection of buried victims in natural disasters. In addition, the radar system could differentiate different frequency rates for different targets, demonstrating that it is highly sensitive. Using a frequency of 5.8 GHz and USRP output power of 0.33 mW, our proposed method was able to detect the respiration rate at a distance of 2 m or less with acceptable error. The radar system is integrated directly with the GNU Radio Companion software as the processing part. The experimental system is designed using the USRP B200 mini-module as the main component of the radar and the Vivaldi antennas working at 5.8 GHz. We use a mathematical model of human breathing to further explore any insights into signal processes in the radar. This paper proposes a human respiration rate detection system using micro-Doppler radar with quadrature architecture in the industrial, scientific, and medical (ISM) frequency of 5.8 GHz. Further, micro-Doppler radar can also be implemented in medical applications for remote monitoring and examination. In particular, micro-Doppler radar has been widely developed to perform certain tasks, such as detection of buried victims in natural disaster, drone system detection, and classification of humans and animals. Recently, rapid advances in radio detection and ranging (radar) technology applications have been implemented in various fields. ![]()
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