GPS导航系统再入黑障现象地面再现实验

发布时间：2017-12-31 03:13

本文关键词：GPS导航系统再入黑障现象地面再现实验　出处：《西安电子科技大学学报》2016年02期 　论文类型：期刊论文

【摘要】：针对飞行器以超高声速再入大气层时,表面产生等离子体,等离子体会降低电磁波信号的传播,严重时会造成导航中断的问题,理论计算了等离子体对全球定位系统导航信号的衰减,并分析了全球定位系统接收信号的功率阈量;利用低气压辉光放电原理在地面产生大面积、长时间稳定的可控等离子体,在实验室环境下持续再现了等离子体下全球定位系统导航信号正常接收、黑障产生、持续、消失的过程,实验测量了等离子体的衰减和接收机的功率阈量.实验结果表明,等离子体下全球定位系统接收信号的衰减临界值与接收机本身的功率阈量相差不到0.5dB,数值几乎一致;实验模拟了飞行器再入过程中等离子体下全球定位导航系统通信黑障前后的工作过程,再现了等离子体下全球定位系统导航正常、失败、重新定位的过程.这为导航系统的通信黑障研究和再入通信的接收机设计提供了参考.
[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.
【作者单位】：西安电子科技大学空间科学与技术学院;
【基金】：中央高校基本科研业务费专项资金资助项目(K72125087) 国家重点基础研究发展计划(973计划)资助项目(2014CB340205)
【分类号】：TN967.1;V216
【正文快照】： 飞行器以超高声速再入大气层时,其表面附近的空气分子会因两者之间摩擦导致的剧烈热运动而被电离,形成等离子体.等离子体在一定条件下会影响飞行器导航信号的传播,严重时会导致信号中断,即黑障现象,给飞行器的实时监测和控制带来困难[1-6],威胁飞行员生命.因此,了解、掌握等离

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