伊夫斯博士解释到，基于用来模拟卫星衰变的软件，可以产生不同的估计数。
And a number of different estimates could be produced depending what software is used to model the satellite's decay, Dr Eves explained.
其主要功能就是通过改变码相位、多普勒频移、载波和信噪比来模拟卫星轨道上真实卫星发射的信号。
Their main function is to simulate the satellite signal from the really satellite on the satellite orbit through changing code phase, Doppler shift, carrier and signal-to-noise ratio.
如果模拟可以直接连入卫星数据库，它甚至可能帮助未来的拖船驾驶员安全地拖动冰山。
If the simulation can plug directly into a satellite database, it might even help future tugboat pilots safely steer with an iceberg in tow.
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