共查询到19条相似文献,搜索用时 109 毫秒
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增强罗兰(eLoran)是在罗兰 C 基础上发展起来的性能更优的远程无线电导航系统, 介绍了近期增强罗兰导航技术在国外以及我国的发展情况,对增强罗兰导航技术中的发射技术、 传播修正技术、差分高精度定位技术以及标准制定方面的最新发展情况进行了详细说明,推动了增强罗兰导航技术的发展和应用。 相似文献
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罗兰C数据链的设计与实现 总被引:1,自引:0,他引:1
李君一 《太赫兹科学与电子信息学报》2006,4(5):356-360
罗兰C数据链是利用罗兰C导航信号作载体建立的数据通讯系统。罗兰C发射台将编码后的电文信息调制在信号脉冲上,以广播方式发送给用户,用户接收机对接收到的信号进行解调和解码后,输出电文信息。利用罗兰C数据链播发电文信息,对双星导航系统进行增强,实现了无源三维导航定位。 相似文献
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罗兰C数据链已成为罗兰C系统扩展应用的重要方向,它不仅可以广播卫星导航的差分和完善性信息,而且也可在罗兰C差分和星基/陆基综合导航中应用。本文对罗兰C数据链技术在组合导航试验系统中的应用进行了论述,并介绍了“信息发播”功能的实现方法。 相似文献
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罗兰C数据调制技术研究 总被引:1,自引:0,他引:1
罗兰C数据链已成为罗兰C系统扩展应用的重要方向,它不仅可以广播卫星导航的差分和完善性信息,而且也可在罗兰C差分和星基,陆基综合导航中应用.本文对罗兰C数据链的调制技术进行了论述,分析了附加调制对罗兰系统的影响,并介绍了调制的实现方法. 相似文献
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本文论述了目前罗兰C和卫星导航组合应用的几种方式,对罗兰C和卫星导航伪距组合定位以及罗兰C和卫星导航定位数据融合的原理和方法进行了论证,通过罗兰C和卫星导航的组合应用,可以克服单一导航系统的弱点,提高组合导航的性能,拓展了罗兰C的应用领域,延长了罗兰C的使用周期。 相似文献
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我国目前的导航状况存在着一个严重的问题,若依赖于GPS,则受人控制,导航的可靠性难以保障,若仅依赖于我国的罗兰C系统,则台链的交接区难以靠某一个台链导航,为解决这个问题,西安导航技术研究所研制了XN969组合接收机,本文将简述该组合接收机性能,原理后,将进一步论述在我国罗兰C导航系统信号覆盖区内,利用该组合导航仪来提高我国罗兰C系统的导航性能的有关问题。 相似文献
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本文从运用矩阵理论对纠错编码的原理阐述出发,着重在罗兰C数据链中应用RS纠错巴技术,可以实现罗兰C组合导航中的GPS差分定位方面作了较为具体的分析,拓展了罗兰C的应用。 相似文献
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《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1983,71(10):1127-1139
A survey is provided of the many new developments in the Loran-C radio navigation system in recent years; in system coverage, capabilities, and applications. These have come about as a result of new station installations and modern electronics. System techniques are reviewed and uqpdated, information on radio propagation is summarized, and micropcocessor-based receiver developments and solid-state ground transmitters are described. This has resulted in new applications of Loran-C to harbor navigation, civil aviation, and terrestrial uses, as well as extension of long-range capabilities, Extensive references are provided. 相似文献
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The propagation of the ground-wave pulse between points on the ground is of considerable practical importance, particularly in the application of the Loran-C navigation system to the absolute time synchronization of geographically separated clocks. Thus, the envelope of the pulse is frequently used to remove ambiguities which would otherwise result from the pulse synchronization at the characteristic or carrier frequency of the pulse. The propagation of the ground wave over finitely conducting ground modifies the propagation time of the tagged point-in-time on the envelope by amounts which may be sufficiently large as to cause cycle ambiguitypm pi radians at the carrier or characteristic frequency of the pulse. It is therefore the purpose of this paper to investigate the magnitude of this error by ascertaining the true signal velocity as determined by tagging a point-in-time on the leading edge of a groundwave pulse and calculating the time corrections for various ground conductivities and distances. These calculations can then be applied to resolve thepm pi radians ambiguity of the precision phase velocity instrumentation for Loran-C especially when the system is used for absolute-time synchronization. 相似文献
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《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1983,71(10):1193-1198
This paper will discuss the interdependence between navigation and Precise Time and Time Interval (PTTI) systems. The modern role that navigation systems play in the field of timekeeping is shown through examples of how Omega, Loran-C, TRANSIT, and the Global Positioning System (GPS) are utilized by the PTTI community. 相似文献
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介绍了罗兰C授时系统组成及原理,描述了罗兰C授时监测的功能和时间基准,给出了罗兰C授时监测站的设计,并对试验结果进行了分析。 相似文献