下载后可任意编辑伪码测距技术讨论摘要：随着扩频通信技术的飞跃进展，其应用领域愈发广泛，这离不开它本身的优点，信号的功率谱密度低、相邻信道干扰小、保密性强且难以被截获、可实现码分多址等特点。扩频通信中的伪码特有的测距能力——周期长，具有尖锐的自相关函数，采纳 CDMA 技术可以实现对多个目标同时进行测控，而且可以大大提高测距的精度。本文主要学习和讨论了伪码测距在卫星测控系统中的理论基础和一些应用。介绍了传统的测距方法：侧音测距，提出伪码测距的优越性，相应的介绍了其测距原理，和伪码的产生以及扩频通信的相关知识，学习了 m 序列的性质。重点讨论了伪码测距的快速捕获、同步、跟踪问题和测距精度的一些算法。就误差分析中涉及到的多径效应中产生的时延扩展等问题进行了仿真，得出时延扩展越大，失真越严重，造成的误差值越大。关键词：伪码测距；同步；捕获 ；跟踪；多径效应下载后可任意编辑Research of pseudo-code ranging technology Abstract: With the rapid development of spread spectrum communications technology, making their applications become more widely used, is inseparable from its own advantages, such as low power spectral density of the signal, a small adjacent channel interference, promises secrecy and difficult to be intercepted, can achieve code division multiple access and other features. The pseudo-code spread spectrum communication peculiar ranging capability - long period, having a sharp autocorrelation function, the CDMA techniques can be implement with several targets to be observed and controlled , and can greatly improve the accuracy of distance measurement. In this design, I have studied and researched the pseudo-code ranging theoretical foundation about the satellite monitoring system and some applications. What′more , A traditional method was introduced: side-tone ranging, which compared with pseudo-code ranging. Pseudo-code had it′s superiority. Relevantly, I introduced the ranging principle, some knowledge about the spread s...
