A new method of determining the satellite initial orbit with attitude data is presented.

提出了一种利用姿态测量数据确定卫星初始轨道的新方法。

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This paper introduces methods of calculation the initial orbit of the satellite only with the velocity vectors of two epochs.

本文介绍了仅用卫星两个时刻速度向量计算卫星初轨的方法。

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Mars Express went into an initial orbit around Mars at about the time that Beagle 2 was landing, and it is now being manoeuvred into an operational orbit that will take it over both poles.

ECONOMIST: The current crop of Mars missions has got off to a bad start

The intervening weeks will be spent in a manoeuvre called aerobraking, which involves using the air-resistance of the thin Martian atmosphere to change the elliptical initial orbit into a circular one from which the planet's surface can be examined in detail.

ECONOMIST: Mars Odyssey

Their initial efforts involved listening with Mars Odyssey, an American craft already in orbit, and with various Earth-bound radio telescopes.

ECONOMIST: The current crop of Mars missions has got off to a bad start