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温家宝的# 8217年代最新的x射线卫星定位是什么意思深空探索

A rendering of China's XPNAV-1 satellite (CAST)。

A rendering of China’;s XPNAV-1 satellite (CAST)。

On November 10, aboard a Long March 11 rocket, China launched a suite of satellites into space。 Among them was the innovative X-ray Pulsar Navigation 1 (XPNAV 1) satellite which is equipped with a world’;s first instrument that offers X-ray-based navigation。 Unlike classical satellites and spacecraft that rely on GPS-like features, the XPNAV 1 uses X-ray sources from space like those emitted by pulsars to triangulate its position。 In other words, this tiny satellite is paving the way for a new class of spacecraft that will not only breach the final frontier but also find its way around it。

To send spacecraft to Jupiter or land them on a comet, scientists require deep space navigation with incredible precision, as otherwise, the spacecraft would just crash in the first junk it encounters in space。 To navigate these spacecraft, we generally set our own planet as a reference point。 We know Earth’;s  orbital parameters and inherent motions very well, so it’;s just a matter of measuring the craft’;s distance from Earth, the component of its velocity that is directly toward or away from Earth, and its position in Earth’s sky。 These parameters are then converted to a sun-centric model。

This workflow has worked very well so far, but what happens if you want to exit the solar system? Because the craft is now many billions of miles away from Earth, it’;s much harder to track and navigation can become increasingly skewed。 As the craft gets farther and farther away from Earth, it will eventually travel in the dark。

本文源自: 环亚娱乐游戏

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