簡易型自動追尾アンテナによる船舶上での静止気象衛星画像の受信

概要

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A simple, two-axis controlled, satellite tracking antenna for vessels, which has been designed by the present authors originally for satellite broadcasting, is applied to the reception of images from the geostationary meteorological satellite on board. Instead of an expensive vertical gyroscope, small and inexpensive pendulum-type inclinometers are used as sensors for rolling and pitching, which require some adjustment of the obtained values. A rather small parabolic antenna of 0.75m in diameter is used to lighten a load due to wind pressure. The allowable angular error increases, though carrier power at the receiver decreases owing to the reduced aperture area. The nominal value of noise figure of the pre-amplifier is 1.8dB. The device was tested for receiving images on a ship which steamed around the Pacific Ocean. It was proved that the images received by the present device were satisfactory in the vast area with elevation angle down to 30°covering Sakhalin in the north and New Zealand in the south. The multi-path fading was often observed in the area lower than 25°. An antenna with larger aperture will expand the area by increasing the reception power and decreasing the fading.
社団法人日本航海学会の論文
1990-03-20