Adv. Radio Sci., 19, 221–232, https://doi.org/10.5194/ars-19-221-2022,https://doi.org/10.5194/ars-19-221-2022, 2022
This paper presents the implementation of two easy-to-implement methods for radar imaging with a radar system on a linear drive for educational purposes.
This method is a so-called synthetic aperture radar (SAR) approach which is commonly used in the space and aeronautical earth observation.
In this paper the two methods are compared with each other and drawbacks and advantages are discussed.
Sassan Schäfer, Simon Müller, Daniel Schmiech, and Andreas R. Diewald
Adv. Radio Sci., 18, 97–110, https://doi.org/10.5194/ars-18-97-2020,https://doi.org/10.5194/ars-18-97-2020, 2020
In this paper two different antenna topologies for improving the heart beat and breathing detection of people in their homes is shown. A radar system including these antennas for imaging with digital beamforming algorithms has been developed and presented. Measurements are executed and given in this paper with a conclusion.
Daniel Schmiech, Aly Marnach, and Andreas R. Diewald
Adv. Radio Sci., 17, 249–256, https://doi.org/10.5194/ars-17-249-2019,https://doi.org/10.5194/ars-17-249-2019, 2019
One of the most important signs of a living body demonstrating its life-sustaining functions is the respiration rate. State of the art for measuring this vital sign is using a monitoring system cable connected to electrodes which are attached to the patients' skin. Especially in the case of newborn infants this method is not always suitable and causing several problems, like skin injuries, high stress levels and random loosening of the sensor. To avoid these a non-contact system is developed.
Adv. Radio Sci., 17, 27–34, https://doi.org/10.5194/ars-17-27-2019,https://doi.org/10.5194/ars-17-27-2019, 2019
The increasing availability of off-the-shelf high frequency components makes radar measurement become popular in mainstream industrial applications. We present a cooperative radar for strongly reflective environments, being devised for a range of up to approx. 120 m. The target is designed with an unambiguous signature method. A prototype is built with commercial
semiconductor components that operates in the 24 GHz band. First experimental results taken in sewage pipes are presented.
Andreas R. Diewald, Manuel Steins, and Simon Müller
Adv. Radio Sci., 16, 203–213, https://doi.org/10.5194/ars-16-203-2018,https://doi.org/10.5194/ars-16-203-2018, 2018
A concept of low-cost hardware for radar target simulation is presented. The theoretical foundations are derived and analyzed. An implementation of a demonstrator operating in the 24 GHz ISM band is shown for which the dynamical range simulation was implemented in a FPGA with fast sampling 10 ADCs and DACs. By using a FIR filtering approach a fine discretization of the range could be reached which will furthermore allow an inherent and automatic Doppler simulation by moving the target.
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A radar working in the 24 GHz ISM-band in a frequency modulated continuous wave mode has been used for vital sign monitoring of the heart beat and the breathing rate. The observation is hereby contactless with the patient sitting straight up in a distance of 1–2 m to the radar. A mathematical method to calculate the heart beat and breathing rate is presented. The results are compared with classical ECG measurement equipment.
A radar working in the 24 GHz ISM-band in a frequency modulated continuous wave mode has been...