Panasonic Corporation

Yasunari Kimura

Hirokazu Kobayashi

Yoichi Nakagawa

Takashi Fukagawa

Makoto Funabiki

Hirohito Mukai

Mikio Morioka

Masataka Sugiura

Junko Ueda

Kazuyuki Aota

Arata Mukai

Provided are a distance measuring device and a distance measuring method which can easily distinguish a reflected signal from a desired tag from an unnecessary wave so as to improve the distance measuring accuracy even when IR-UWB is used for measuring a distance. The method uses a reader ID indicated by a code string formed by P bits (P is a natural number) for identifying a base station and a tag ID indicated by a code string formed by Q bits (Q is a natural number) for identifying a radio terminal. The method generates a unique word containing P pulses, each of which is ON/OFF-modulated depending on whether each of P bits indicating the reader ID is 1 or 0. The method generates a frame containing 2 M unique words and a burst containing Q frames. The method further outputs a transmission signal containing a plurality of bursts. A radio terminal Amplitude Shift Keying (ASK)&#x2014;modulates the transmission signal depending on whether each of the Q bits indicating the tag ID is 1 or 0. The ASK-modulated signal is sampling-received at timings of different phases by 1/M (M is an integer not smaller than 1) of the transmission clock cycle.

Base station device and distance measuring method

A position identifying system () is comprised of a radio terminal device () carried by a monitoring target and a sensor device () provided with a radio communication unit () for communicating by radio with the radio terminal device () and a camera unit () for taking an image of the monitoring target. In the sensor device (), the position (tag position) of the radio terminal device () is detected on the basis of a detection signal from the radio terminal device (), and the position (image position) of the monitoring target is calculated on the basis of the image taken by the camera unit (). By linking the tag position with the image position, the position of the monitoring target is identified. Thus, there is provided the position identifying system capable of identifying the position of the monitoring target and keeping track of the movement of the monitoring target even if the image of the monitoring target cannot be taken.

Tag sensor system and sensor device, and object position estimating device and object position estimating method

Growing community of inventors

Kanagawa, Japan

Yasunari Kimura