Simultaneous Life Detection and Localization Using a Wideband Chaotic Signal with an Embedded Tone

Liu, Lei; Guo, Chaoyi; Li, Jingxia; Xu, Hang; Zhang, Jianguo; Wang, Bingjie

doi:10.3390/s16111866

Cited by 10 publications

(7 citation statements)

References 43 publications

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“…With the growth of scientific innovation in the field of remote sensing, a hybrid (On-Chip Split-Ring-Based Sensor) RADAR system has emerged with high-resolution range and sensitivity. This system can easily detect multiple life forms simultaneously even across obstacles (Liu et al 2016 ).…”

Section: Techniques For Monitoring Biodiversitymentioning

confidence: 99%

An overview of remote monitoring methods in biodiversity conservation

Kerry

Montalbo

Das

et al. 2022

Environ Sci Pollut Res

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Conservation of biodiversity is critical for the coexistence of humans and the sustenance of other living organisms within the ecosystem. Identification and prioritization of specific regions to be conserved are impossible without proper information about the sites. Advanced monitoring agencies like the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services (IPBES) had accredited that the sum total of species that are now threatened with extinction is higher than ever before in the past and are progressing toward extinct at an alarming rate. Besides this, the conceptualized global responses to these crises are still inadequate and entail drastic changes. Therefore, more sophisticated monitoring and conservation techniques are required which can simultaneously cover a larger surface area within a stipulated time frame and gather a large pool of data. Hence, this study is an overview of remote monitoring methods in biodiversity conservation via a survey of evidence-based reviews and related studies, wherein the description of the application of some technology for biodiversity conservation and monitoring is highlighted. Finally, the paper also describes various transformative smart technologies like artificial intelligence (AI) and/or machine learning algorithms for enhanced working efficiency of currently available techniques that will aid remote monitoring methods in biodiversity conservation.

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Section: Techniques For Monitoring Biodiversitymentioning

confidence: 99%

An overview of remote monitoring methods in biodiversity conservation

Kerry

Montalbo

Das

et al. 2022

Environ Sci Pollut Res

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“…Prior reported research attempts mostly focused on exploring ultra-wideband (UWB) and frequency-modulated continuous wave (FMCW) radar for the detection of the respiration rate through the wall ( Lubecke et al, 2007 ; Wang et al, 2012 ; Alizadeh et al, 2019 ; Duan and Liang, 2019 ). In ( Liu et al, 2016 ; Xu et al, 2019 ), a wideband chaotic signal was proposed to detect the range and respiratory signal of a human subject. In Liu et al (2016) , a correlation-based technique is used to detect life signs from echo signals.…”

Section: Introductionmentioning

confidence: 99%

Through the wall human heart beat detection using single channel CW radar

Pramanik,

Islam

2024

Front. Physiol.

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Single-channel continuous wave (CW) radar is widely used and has gained popularity due to its simple architecture despite its inability to measure the range and angular location of the target. Its popularity arises in the industry due to the simplicity of the required components, the low demands on the sampling rate, and their low costs. Through-the-wall life signs detection using microwave Doppler Radar is an active area of research and investigation. Most of the work in the literature focused on utilizing multi-channel frequency modulated continuous wave (FMCW), CW, and ultra-wideband (UWB) radar for their capability of range and direction of arrival (DOA) estimation. In this paper, through-the-wall single-subject and two-subject concurrent heart rate detection using single-channel 24-GHz CW radar leveraged with maximal overlap discrete wavelet transform (MODWT) is proposed. Experimental results demonstrated that the repetitive measurement of seven different subjects at a distance of 20 cm up to 100 cm through two different barriers (wood and brick wall) showed an average accuracy of heart rate extraction of 95.27% for varied distances (20–100 cm) in comparison with the Biopac ECG acquisition signal. Additionally, the MODWT method can also isolate the independent heartbeat waveforms from the two subjects’ concurrent measurements through the wall. This involved four trials with eight different subjects, achieving an accuracy of 97.04% for a fixed distance of 40 cm from the Radar without estimating the angular location of the subjects. Notably, it also superseded the performance of the direct FFT method for the single subject after 40 cm distance measurements. The proposed simpler architecture of single-channel CW radar leveraged with MODWT has several potential applications, including post-disaster search and rescue scenarios for finding the trapped, injured people under the debris, emergency evacuation, security, surveillance, and patient vital signs monitoring.

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“…As a result, millimeter wave radar working at a higher frequency can detect the human body more precisely without requiring a larger antenna diameter, which is very beneficial to the miniaturization and portability of the equipment. In order to realize the non-contact detection of vital signs, researchers used the Doppler principle to extract the phase change information caused by the weak physiological movements on the body surface from the echo of radar wave, and extracted heartbeat and respiratory signals by means of various signal processing methods, thus developing various non-contact life parameters detection systems [ 6 , 7 , 8 , 9 , 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Non-Contact Monitoring of Human Vital Signs Using FMCW Millimeter Wave Radar in the 120 GHz Band

Lin

et al. 2021

Sensors

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A non-contact heartbeat/respiratory rate monitoring system was designed using narrow beam millimeter wave radar. Equipped with a special low sidelobe and small-sized antenna lens at the front end of the receiving and transmitting antennas in the 120 GHz band of frequency-modulated continuous-wave (FMCW) system, this sensor system realizes the narrow beam control of radar, reduces the interference caused by the reflection of other objects in the measurement background, improves the signal-to-clutter ratio (SCR) of the intermediate frequency signal (IF), and reduces the complexity of the subsequent signal processing. In order to solve the problem that the accuracy of heart rate is easy to be interfered with by respiratory harmonics, an adaptive notch filter was applied to filter respiratory harmonics. Meanwhile, the heart rate obtained by fast Fourier transform (FFT) was modified by using the ratio of adjacent elements, which helped to improve the accuracy of heart rate detection. The experimental results show that when the monitoring system is 1 m away from the human body, the probability of respiratory rate detection error within ±2 times for eight volunteers can reach 90.48%, and the detection accuracy of the heart rate can reach 90.54%. Finally, short-term heart rate measurement was realized by means of improved empirical mode decomposition and fast independent component analysis algorithm.

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Simultaneous Life Detection and Localization Using a Wideband Chaotic Signal with an Embedded Tone

Cited by 10 publications

References 43 publications

An overview of remote monitoring methods in biodiversity conservation

An overview of remote monitoring methods in biodiversity conservation

Through the wall human heart beat detection using single channel CW radar

Non-Contact Monitoring of Human Vital Signs Using FMCW Millimeter Wave Radar in the 120 GHz Band

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