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为什么NASA的深空原子钟可以在宇宙中提供导航 – 译学馆
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为什么NASA的深空原子钟可以在宇宙中提供导航

How NASA’s Deep Space Atomic Clock Could Be the Next Space GPS

我们如何在太空中航行?
>> How do we navigate through space?
目前 在地球之外飞行的宇宙飞船
Currently, spacecraft flying beyond Earth
无法通过GPS来导航
don’t have a GPS to findtheir way through space.
地球上的导航员向宇宙飞船发送信号
Navigators on Earth send a signal to the spacecraft,
宇宙飞船接收信号并将其返回
which receives it and sends it back.
地面上极其精确的时钟 叫做原子钟
Extremely precise clocks on the ground, called atomic clocks,
用来测量信号来回传输花费的时间
measure how long it takes the signal to make this two-way journey.
传输时间可以计算出
The amount of time tells them
宇宙飞船有多远
how far away the spacecraft is,
以及速度有多快
and how fast it’s going.
宇宙飞船飞得越远
The farther out in space the spacecraft is,
接收和发送信号的时间就越长
the longer it takes to receive and send a signal.
如果人类被送到另一个像火星这样的星球呢?
But what if humans are sent to another planet like Mars?
一个双向系统的信号
A two-way system that sends a signal
从地球到宇宙飞船
from Earth to a spacecraft,
再从宇宙飞船返回地球 最后再发送给宇宙飞船
back to Earth and then tothe spacecraft again
一次平均需要40分钟
would take an average of 40 minutes.
想象一下 如果你手机的GPS需要花40分钟来计算你的位置
Imagine if the GPS on your phone took 40 minutes to calculate your position.
你可能会在位置计算出来之前
You might miss your turn, or be several exits down the highway
错过转弯 或开过了好几个高速出口
before it caught up with you.
如果人类飞往这个红色星球
If humans travel to the Red Planet,
单向系统会更佳
it would be better if the system was one-way,
这样探险者们就能马上
allowing the explorers to immediately
确定他们当前的位置
determine their current position rather than waiting
不需要等待信号从地球发送回来
for that information to come back from Earth.
NASA正在测试一项这样的新技术
NASA is testing new technology that would allow future explorers to do just that.
深空原子钟展示了
The Deep Space Atomic Clock is the first demonstration of an
首个能在深空导航的原子钟
atomic clock that can be used for navigation in deep space.
它使宇宙飞船可以计算自己的轨道
It will allow a spacecraft to calculate its own trajectory,
不需要依赖地球
instead of depending on Earth.
如果宇宙飞船上有一个这样的时钟
If a spacecraft had one of these clocks on board,
它就能从地球上的大天线接收信号
it could receive a signal from one of those big antennas on Earth,
并迅速测量自己的速度和位置
and quickly measure its speed and position.
深空原子钟有朝一日可以让宇航员
The Deep Space Atomic Clock could one day let astronauts
安全准确地航行到火星或甚至更远的地方
navigate safely and accurately to Mars and beyond.
这项技术迈出了第一步
This technology demonstration is the first step
未来单向太空导航将可能成为现实
in making one-way space navigation a reality.
[太空技术探索]
[Explore Space Tech]
[美国国家航空航天局]
[NASA]

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视频概述

宇宙飞船在太空中要怎样定位导航? NASA展示了一项新技术——深空原子钟,将成为未来的太空GPS

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视频来源

https://www.youtube.com/watch?v=4GEeak4Vphs

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