Sensors, Vol. 23, Pages 1335: Frequency Comb-Based Ground-Penetrating Bioradar: System Implementation and Signal Processing

Sensors, Vol. 23, Pages 1335: Frequency Comb-Based Ground-Penetrating Bioradar: System Implementation and Signal Processing Sensors doi: 10.3390/s23031335 Authors: Di Shi Gunnar Gidion Taimur Aftab Leonhard M. Reindl Stefan J. Rupitsch Radars can be used as sensors to detect the breathing of victims trapped under layers of building materials in catastrophes like earthquakes or gas explosions. In this contribution, we present the implementation of a novel frequency comb continuous wave (FCCW) bioradar module using a commercial software-defined radio (SDR). The FCCW radar transmits multiple equally spaced frequency components simultaneously. The data acquisition of the received combs is frequency domain-based. Hence, it does not require synchronization between the transmit and receive channels, as time domain-based broadband radars, such as ultra wideband (UWB) pulse radar and frequency-modulated CW (FMCW) radar, do. Since a frequency comb has an instantaneous wide bandwidth, the effective scan rate is much higher than that of a step frequency CW (SFCW) radar. This FCCW radar is particularly suitable for small motion detection. Using inverse fast Fourier transform (IFFT), we can decompose the received frequency comb into different ranges and remove ghost signals and interference of further range intervals. The frequency comb we use in this report has a bandwidth of only 60 MHz, resulting in a range resolution of up to 2.5 m, much larger than respiration-induced ...
Source: Sensors - Category: Biotechnology Authors: Tags: Article Source Type: research