本文關(guān)鍵詞：GPS導(dǎo)航系統(tǒng)再入黑障現(xiàn)象地面再現(xiàn)實(shí)驗(yàn)　出處：《西安電子科技大學(xué)學(xué)報(bào)》2016年02期 　論文類型：期刊論文

  更多相關(guān)文章： 再入 等離子體 導(dǎo)航系統(tǒng) 黑障 功率閾量

【摘要】：針對(duì)飛行器以超高聲速再入大氣層時(shí),表面產(chǎn)生等離子體,等離子體會(huì)降低電磁波信號(hào)的傳播,嚴(yán)重時(shí)會(huì)造成導(dǎo)航中斷的問題,理論計(jì)算了等離子體對(duì)全球定位系統(tǒng)導(dǎo)航信號(hào)的衰減,并分析了全球定位系統(tǒng)接收信號(hào)的功率閾量;利用低氣壓輝光放電原理在地面產(chǎn)生大面積、長(zhǎng)時(shí)間穩(wěn)定的可控等離子體,在實(shí)驗(yàn)室環(huán)境下持續(xù)再現(xiàn)了等離子體下全球定位系統(tǒng)導(dǎo)航信號(hào)正常接收、黑障產(chǎn)生、持續(xù)、消失的過程,實(shí)驗(yàn)測(cè)量了等離子體的衰減和接收機(jī)的功率閾量.實(shí)驗(yàn)結(jié)果表明,等離子體下全球定位系統(tǒng)接收信號(hào)的衰減臨界值與接收機(jī)本身的功率閾量相差不到0.5dB,數(shù)值幾乎一致;實(shí)驗(yàn)?zāi)M了飛行器再入過程中等離子體下全球定位導(dǎo)航系統(tǒng)通信黑障前后的工作過程,再現(xiàn)了等離子體下全球定位系統(tǒng)導(dǎo)航正常、失敗、重新定位的過程.這為導(dǎo)航系統(tǒng)的通信黑障研究和再入通信的接收機(jī)設(shè)計(jì)提供了參考.
[Abstract]:When an aircraft reenters the atmosphere with ultra-high sound velocity, plasma is produced on the surface. The plasma will reduce the propagation of electromagnetic wave signal, and will cause the problem of navigation interruption when the vehicle is re-entering the atmosphere with ultra-high sound speed. The attenuation of GPS navigation signal by plasma is calculated theoretically, and the power threshold of GPS received signal is analyzed. Based on the principle of low pressure glow discharge, a large area and stable controlled plasma is produced on the ground for a long time. In the laboratory environment, the GPS navigation signal under the plasma is received normally and the black barrier is produced. The attenuation of the plasma and the power threshold of the receiver are measured experimentally during the continuous and vanishing process. The experimental results show that. The attenuation threshold of the received GPS signal under plasma is less than 0.5 dB, which is almost consistent with the power threshold of the receiver itself. The experiment simulates the working process before and after the communication black barrier of GPS under plasma during the reentry process of aircraft, and reappears the normal navigation of GPS under plasma and fails. This provides a reference for the research of communication black barrier and the design of receiver for reentry communication.
【作者單位】： 西安電子科技大學(xué)空間科學(xué)與技術(shù)學(xué)院;
【基金】：中央高�；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金資助項(xiàng)目(K72125087) 國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(973計(jì)劃)資助項(xiàng)目(2014CB340205)
【分類號(hào)】：TN967.1;V216
【正文快照】： 飛行器以超高聲速再入大氣層時(shí),其表面附近的空氣分子會(huì)因兩者之間摩擦導(dǎo)致的劇烈熱運(yùn)動(dòng)而被電離,形成等離子體.等離子體在一定條件下會(huì)影響飛行器導(dǎo)航信號(hào)的傳播,嚴(yán)重時(shí)會(huì)導(dǎo)致信號(hào)中斷,即黑障現(xiàn)象,給飛行器的實(shí)時(shí)監(jiān)測(cè)和控制帶來困難[1-6],威脅飛行員生命.因此,了解、掌握等離

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