Measuring distances using radar. A predetermined measurement distance is used to measure distance, and the distance is calculated from the product of the radio wave speed and the round-trip time. When using pulse radar, the distance resolution is determined by the pulse width. When the pulse width is 10-6 seconds, the length is 150 m. Measurement errors of tens of meters can occur due to the pulse width, reflectors, and reflections from nearby reflecting objects. An example of long-distance measurement is radar observation of planets in the field of astronomy. Planetary radar observation began in the early 1960s and has expanded to Venus, Mercury, and Mars. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
レーダーを用いて距離を測定すること。測距にはあらかじめ測定距離を決めて用い,電波速度と往復時間の積から距離を求める。パルスレーダーを用いるときはパルス幅で距離分解能が決まる。パルス幅が10-6秒のとき長さは150mとなる。パルス幅,反射物,反射物体付近からの反射などで数十mの測定誤差を生ずる。 遠距離の測定例には,天文分野における惑星のレーダー観測がある。惑星のレーダー観測は1960年代初頭から始まり,金星,水星,火星へと広がっていった。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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