A method for ego-vehicle speed estimation using a fast chirp modulation (FCM) radar is proposed, which estimates the vehicle speed spectrum using a discrete Fourier transform and tracks the peak of the spectrum to estimate vehicle speed. Because it is applied to the intermediate-frequency signal, it can estimate vehicle speed without detecting objects. The proposed method can estimate low speeds which cannot be measured by wheel speed sensors. The estimated results of experiments using a vehicle were compared with those of in-vehicle sensors, revealing that the method can estimate vehicle speed using an FCM radar with low antenna elements.
In this paper, we present a bathroom monitoring sensor system using a 79GHz ultra-wideband radar sensor. It offers low privacy and antihumidity capability unlike imaging sensors and IR sensors. It is designed to detect various dangerous states such as falling and drowning with Hidden Markov Model (HMM). We conducted experiments in order to show the effectiveness which is also compared with a conventional scheme. It has been found that our proposed scheme is more accurate than the conventional method.
This paper presents penetration loss measurements of housing outer wall materials at 79 GHz to investigate the coexistence between indoor-use and outdoor-use radar sensors. The penetration loss was measured for building outer wall materials such as window and concrete wall. The penetration loss is also compared with 24 GHz-band because the band is available as indoor-use (e.g., non-contacted health-care monitoring) and outdoor-use (e.g., automotive radar) sensor systems. The loss of indoorto-outdoor systems is experimentally investigated. As a result, the propagation path through outer wall material, at a distance of 5 m from the house, is found to be approximately 50 dB attenuated, which is 15 dB larger as compared with 24 GHz.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.