Matsushita Electric Industrial Co., Ltd.

Kazutaka Iwase

Tsugihiro Kurihara

Hayato Akazawa

Eiji Kobayashi

Kazuaki Kimura

A detection apparatus is provided to detect the direction of arrival and the position of an emission source of radio wave with high accuracy. The apparatus comprises; a first and a second directional antenna and which rotates with a desired angle of elevation; a first and a second phase integral means and for outputting an integration of the output from an antenna; a first and second phase differential means and for outputting an difference of the outputs from an antenna; a first and a second frequency dividing means and for dividing frequency of the integral component of the output from an antenna; a first and a second differential gain control means and for controlling a gain of the differential component of the output from an antenna; a first and a third receiving means and for receiving an output of the frequency dividing means; a second and a fourth receiving means and for receiving an output of the differential gain control means; a first and a second subtraction means and for subtracting one detection signal output from the other detection signal output of each of receiving means and and receiving means and ; a first and a second calculation means and for determining a direction of arrival of radio wave based on an output from the subtraction means; and a position determining calculation means for determining the position of the emission source of the radio wave based on an output from the calculation means.

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Yokohama, Japan

Kazutaka Iwase