时文拓展阅读36中国科学家精确识别太空碎片.docx
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1、时文拓展阅读I中国科学家精确识别太空碎片航天技术的发展让越来越多的国家投身于空间探索,为了实现航天活动,人造卫星、空间探测器、载人飞船等航天器被送入太空,这导致地球轨道上产生了数以万计的太空碎片。为了更精确地识别这些碎片,中国科学家运用了一套新的规则。Chinesescientistshaveused1asers(激光)toaccurate1yidentifyspacedebris(碎片)intheEarth,sorbit.Theteamapp1iedaspecia11ydeve1opedsetofru1esto1aser-rangingte1escopes,whichenab1edthemt
2、oidentifyspacejunkmoreeffective1ythanprevioustechniques.ttAfterimprovingthepointingaccuracyofthete1escopethroughaneura1network(神经网络),spacedebriswithacrosssectiona1areaofonesquaremeteratadistanceof1500ki1ometerscanbedetected,TianmingMa,anauthorofthestudyfromtheChineseAcademyofSUrVeyingandMapping,said
3、inastatement.AccordingtoNASA,orbita1debrisisanyman-madeobjectinorbitaroundtheEarththatno1ongerservesausefu1function.Debriscaninc1udenon-functiona1spacecraft,abandoned1aunchvehic1estages,andothermission-re1atedspacejunk.ItposesasignificantrisktoastronautsandspacecraftinorbitabovetheEarthasittrave1sve
4、ryfastupto18,000mi1esperhour,whichisfasterthanabu11et.Worrying1y,thereareestimatedtobemanymi11ionsoftinydebrispiecesinIow-Earthorbit,andtensofthousandstimes1argerthanasoftba11,thespaceagencysaid.Fortunate1y,therehavebeensurprising1yfewco11isions.Inthestudy,Maandhisteamusedtwodifferentneura1networkst
5、ohe1pidentifyspacedebriswiththe1aser-rangingte1escope.Theythentestedthismethodagainstmoretraditiona1techniques.Accordingtotheteam,thisisthefirsttimethatneura1networkshavebeenusedtosignificant1yimprovethepointingaccuracyofa1aser-rangingte1escope.Theysaythe1atestfindingscou1dhavesignificantimp1ication
6、sformanoeuvringspacecraftinorbit.1aser-rangingtechno1ogyhasprevious1ybeenusedtodetectspacejunk.However,thesesystemshave1imitationswhenitcomestoaccurate1yidentifyingsma11,fast-movingpieces.Infact,previous1aser-rangingmethodshaveon1ybeenaccuratetoabout0.6mi1es.Inanattempttoovercometheinaccuraciesof1as
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