| 摘要 |
PROBLEM TO BE SOLVED: To eliminate a dead angle, to realize a 360 deg. visual field angle and to evaluate the propagation of radio waves and sound waves at a real time by using a fixed sensor and a scanning sensor, which conducts a circumferential scanning and obtaining the interference of the signals received by both of the sensors while moving the scanning sensor. SOLUTION: A radiated wave motion is made to a first received signal by receiving the radiated wave motion with a first sensor while the first sensor is scanned on the circumference. A radiated wave motion is made to a second received signal by receiving the radiated wave motion with a second sensor located at a position without changing to the center of the circumference. Then, the both received signals are interferred with each other to obtain interferred signals and the interferred signals are detected to obtain the measured data at each point. That is, as represented by the expression, a point on the circumference is represented by a rotational angleϕ, the radius of the circle is called r, the imaginary unit is represented by j, the circular constant is calledπ, the rotational angle of the center position is calledϕ', the wavelength of the radiated wave motion is calledλ, the incident angle of the radiated wave motion is calledθand a weighting function is called W(ϕ). Based on the measured data E2 (r,ϕ) at each point, an evaluation function V(ϕ') is calculated and a bearingϕ' of the radiated wave motion is estimated.
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