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IEICE Technical Report

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1 611–0011

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E-mail: 1{masashi iwashimizu,mitani,shino}@rish.kyoto-u.ac.jp2{yonemoto@mech.kyutech.ac.jp}

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Study on Direction Detection in a Microwave Power Transmission System

for a Mars Observation Airplane

Masashi IWASHIMIZU1, Tomohiko MITANI1, Naoki SHINOHARA1, Gaku SASAKI2, Kei

HIRAOKA2, Koyo MATSUZAKI2, and Koichi YONEMOTO2

1 Research Institute for Sustainable Humanosphere, Kyoto University Gokasho, Uji, Kyoto, 611–0011

2 Graduate school of Engineering, Kyushu Institute of Technology

E-mail: 1{masashi iwashimizu,mitani,shino}@rish.kyoto-u.ac.jp2{yonemoto@mech.kyutech.ac.jp}

Abstract In order to attain the weight saving of a Mars observation airplane, we are planning to supply energy

by microwave. This paper presents the direction detection of the airplane. An array antenna on the ground receives

a pilot signal from the airplane, and detects the direction of the airplane by phase differences of antenna elements.

For weight saving, we utilize the second harmonics radiated from rectennas on the airplane as a pilot signal.

Key words Mars Observation Airplane, Direction Detection, Direction of Arrival Estimation, Second Harmonics

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mitan_000WPT2013-37(2014-03)

mitan_000This article is a technical report without peer review, and its polished and/or extended version may be published elsewhere.

THE INSTITUTE OF ELECTRONICS,INFORMATION AND COMMUNICATION ENGINEERS

IEICE Technical Report

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2. 1

2.445GHz 900W

+15.5 dBi

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11 deg.

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ϕ = sin−1(ζπ

)(2)

|δ|

THE INSTITUTE OF ELECTRONICS,INFORMATION AND COMMUNICATION ENGINEERS

IEICE Technical Report

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4.89GHz

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3m

1.5m

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x-y -30 deg.

30 deg.

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THE INSTITUTE OF ELECTRONICS,INFORMATION AND COMMUNICATION ENGINEERS

IEICE Technical Report

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AGC AGC

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AGC

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θ1 θ2

3m

λ/2

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δ = πsinθ1 (3)

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f(θ2)−f(θ1)θ1 30 deg. θ2 30.4 deg. f(θ2)−f(θ1)

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[1] A. Nagahama, T. Mitani, N. Shinohara, K. Fukuda, K. Hi-

raoka, and K. Yonemoto “Auto Tracking and Power Con-

trol Experiments of a Magnetron-based Phased Array Power

Transmitting System for a Mars Observation Airplane”,

IEEE MTT-S IMWS-IWPT 2012, Kyoto, Japan, May 10-

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