A 24 GHz ISM Band Doppler Radar System for Moving Target Sensing

2019 ◽  
Author(s):  
Sungpeel Kim ◽  
Jihoon Bang ◽  
Kyoseung Keum ◽  
Jaehoon Choi ◽  
Kyung-Young Jung ◽  
...  
Keyword(s):  
Doppler Radar ◽  
Radar System ◽  
Moving Target ◽  
Ism Band ◽  
24 Ghz

A 24 GHz ISM-Band Doppler Radar Antenna With High Isolation Characteristic for Moving Target Sensing Applications

2019 ◽  
Vol 18 (7) ◽  
pp. 1532-1536 ◽  
Author(s):  
Sungpeel Kim ◽  
Dong Kyoo Kim ◽  
Youjin Kim ◽  
Jaehoon Choi ◽  
Kyung-Young Jung
Keyword(s):  
Doppler Radar ◽  
Moving Target ◽  
Ism Band ◽  
High Isolation ◽  
Sensing Applications ◽  
Radar Antenna ◽  
24 Ghz

scholarly journals Numerical Study on the Feasibility of a 24 GHz ISM-Band Doppler Radar Antenna for Near-Field Sensing of Human Respiration in Electromagnetic Aspects

2020 ◽  
Vol 10 (18) ◽  
pp. 6159 ◽  
Author(s):  
Seungyong Park ◽  
Sungpeel Kim ◽  
Dong Kyoo Kim ◽  
Jaehoon Choi ◽  
Kyung-Young Jung
Keyword(s):  
Human Body ◽  
Doppler Radar ◽  
Numerical Study ◽  
Near Field ◽  
The Body ◽  
Ism Band ◽  
Human Respiration ◽  
Field Sensing ◽  
Radar Antenna ◽  
24 Ghz

The feasibility study of a 24 GHz industrial, scientific, and medical (ISM) band Doppler radar antenna in electromagnetic aspects is numerically performed for near-field sensing of human respiration. The Doppler radar antenna consists of a transmitting (Tx) antenna and a receiving (Rx) antenna close to the human body for a wearable device. The designed slot-type Doppler radar antenna is embedded between an RO4350B superstrate and an FR-4 substrate. To obtain the higher radiation pattern of the antenna towards the human body, a ground plane reflector is placed underneath the substrate. The measured −10 dB reflection coefficient (S11) bandwidth is 23.74 to 25.56 GHz and the mutual coupling (S21) between Tx and Rx antennas is lower than −30 dB at target frequencies. The Doppler radar performance of the proposed Doppler radar antenna is performed numerically by investigating the signal returned from the human body. The Doppler effect due to human respiration is investigated through the I/Q and arctangent demodulation of the returned signal. According to the results, the phase variation of the returned signal is proportional to the displacement of the body surface, which is about 0.8 rad in accordance with 1 mm displacement. The numerical experiments indicate that the proposed Doppler radar antenna can be used for near-field sensing of human respiration in electromagnetic aspects.

A low-cost Doppler radar system with 24 GHz PLL for remote detection of heart beat

2008 ◽  
Vol 50 (12) ◽  
pp. 3139-3142 ◽  
Author(s):  
Jian Zhang ◽  
Minghui Yang ◽  
Shuqi Zheng ◽  
Xiaowei Sun
Keyword(s):  
Doppler Radar ◽  
Low Cost ◽  
Heart Beat ◽  
Radar System ◽  
Remote Detection ◽  
24 Ghz

scholarly journals Secondary Radar Beacons for Local Ad-Hoc Autonomous Robot Localization Systems

Sensors ◽  
2019 ◽  
Vol 19 (24) ◽  
pp. 5484
Author(s):  
Martin Schütz ◽  
Tatiana Pavlenko ◽  
Martin Vossiek
Keyword(s):  
Ad Hoc ◽  
Radar System ◽  
Linear Feedback ◽  
Signal Model ◽  
Fmcw Radar ◽  
Ism Band ◽  
Feedback Network ◽  
Rf Performance ◽  
24 Ghz ◽  
Localization Systems

In this paper, we present a detailed analysis and implementation of secondary radar beacons designed for a local ad-hoc localization and landing system (LAOLa) to support the navigation of autonomous ground and aerial vehicles. We discuss a switched linear feedback network as a virtually coherent oscillator and show how to use it as a secondary radar transponder. Further, we present a signal model for the beat signal of the transponder response in an FMCW radar system, which is more detailed than in previously published papers. An actual transponder realization in the 24 GHz ISM band is presented. Its RF performance was evaluated both in the laboratory and in the field. Finally, we put forward some ideas on how to overcome the range measurement inaccuracy inherent in this transponder concept.

Data-Based Quadrature Imbalance Compensation for a CW Doppler Radar System

2013 ◽  
Vol 61 (4) ◽  
pp. 1718-1724 ◽  
Author(s):  
Aditya Singh ◽  
Xiaomeng Gao ◽  
Ehsan Yavari ◽  
Mari Zakrzewski ◽  
Xi Hang Cao ◽  
...  
Keyword(s):  
Doppler Radar ◽  
Radar System

scholarly journals Radar system with dedicated planar traveling wave antennas for elderly people monitoring

2020 ◽  
Vol 18 ◽  
pp. 97-110
Author(s):  
Sassan Schäfer ◽  
Simon Müller ◽  
Daniel Schmiech ◽  
Andreas R. Diewald
Keyword(s):  
Elderly People ◽  
Antenna Arrays ◽  
Traveling Wave ◽  
Radar System ◽  
Propagation Path ◽  
Design Parameters ◽  
Microstrip Technology ◽  
Actual Object ◽  
Radar Systems ◽  
24 Ghz

Abstract. Radar systems for contactless vital sign monitoring are well known and an actual object of research. These radar-based sensors could be used for monitoring of elderly people in their homes but also for detecting the activity of prisoners and to control electrical devices (light, audio, etc.) in smart living environments. Mostly these sensors are foreseen to be mounted on the ceiling in the middle of a room. In retirement homes the rooms are mostly rectangular and of standardized size. Furniture like beds and seating are found at the borders or the corners of the room. As the propagation path from the center of the room ceiling to the borders and corners of a room is 1.4 and 1.7 time longer the power reflected by people located there is 6 or even 10 dB lower than if located in the center of the room. Furthermore classical antennas in microstrip technology are strengthening radiation in broadside direction. Radar systems with only one single planar antenna must be mounted horizontally aligned when measuring in all directions. Thus an antenna pattern which is increasing radiation in the room corners and borders for compensation of free space loss is needed. In this contribution a specification of classical room sizes in retirement homes are given. A method for shaping the antenna gain in the E-plane by an one-dimensional series-fed traveling wave patch array and in the H-plane by an antenna feeding network for improvement of people detection in the room borders and corners is presented for a 24 GHz digital beamforming (DBF) radar system. The feeding network is a parallel-fed power divider for microstrip patch antennas at 24 GHz. Both approaches are explained in theory. The design parameters and the layout of the antennas are given. The simulation of the antenna arrays are executed with CST MWS. Simulations and measurements of the proposed antennas are compared to each other. Both antennas are used for the transmit and the receive channel either. The sensor topology of the radar system is explained. Furthermore the measurement results of the protoype are presented and discussed.

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