Decoupling of getting up detection device using ultrasonic radar by changing duty ratio of transmission wave

Yo Yamada, Kanya Tanaka, Kazuo Haruyama, Yuji Wakasa, Takuya Akashi

Research output: Contribution to journalArticle


The decline in the quality of patient's safety control is a problem, because the number of caretakers is reduced by the acceleration of demographic aging in an elder care facility. Especially, the detection of getting up from the bed is very important for preventing patients from falling and wandering unbreakable. In our previous study, we have developed the getting up detection device with an ultrasonic radar, which is safe, cheap, and break-proof. However, if there are many patients in a ward, it is difficult to use some ultrasonic radars. The reason is that if some ultrasonic radars, which have the same frequency, are used in same ward, the ultrasonic signals are coherent with each other. To solve this problem, we propose a novel incoherent method. This method is achieved by improving the software in the device at a low cost.

Original languageEnglish
Pages (from-to)599-604+3
Journalieej transactions on industry applications
Issue number5
Publication statusPublished - 22 Jun 2010



  • Getting up detection device
  • Incoherent
  • Ultrasonic radar

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