GNSS信号的双频调制复用一体化设计研究

With the rapid development of global navigation satellite systems (GNSS), the valid satellite navigation spectrum resources are becoming more and more limited. Meanwhile, the user requirement for signal inherent performance is increasing. Developing dual-frequency modulation-multiplexing integrated signal is a key approach to realize high ranging performance with bandwidth constrained. In this project, the theories and methods of dual-frequency modulation-multiplexing integrated design are investigated, mainly involving the unified representation, joint optimization, and receiving processing of the modulation and constant envelope multiplexing integrated signals. By constructing the parametrical model of the dual-frequency modulation-multiplexing integrated signal, and presenting corresponding performance evaluation methods, this project builds the dual-frequency modulation-multiplexing joint design framework, and proposes a dual-frequency modulation-multiplexing integration scheme which has both high ranging performance and high multiplexing efficiency under the constraint of radio frequency compatibility, with the corresponding receiving methods, in order to resolve the contradiction between radio frequency compatibility, ranging accuracy, and multiplexing efficiency. The research of this project can establish and improve the fundamental theory and methods of the navigation signal modulation-multiplexing integrated design. The research results can provide technological sustentation for the next generation GNSS signal design.

全球导航卫星系统的迅速发展使得卫星导航频谱资源日益紧张，而用户对信号性能的要求却在不断提升。开发双频调制与复用一体化信号是实现带宽受限条件下高性能测距的主要途径。本课题对双频调制复用一体化设计的理论与方法进行研究，包括双频调制与恒包络复用一体化信号的统一表示、联合优化、接收处理方法等。主要的思想是通过构造双频调制复用一体化信号的参数化模型及性能评估方法，建立双频调制与多路复用的联合设计框架，并提出满足频谱约束条件且具有高测距性能和高复用效率的导航信号设计新方案，以及相应的接收处理方法，以解决导航信号设计在射频兼容、测距精度、复用效率之间的矛盾。本课题的研究将建立和完善导航信号调制复用一体化设计的理论和方法，研究成果可为下一代卫星导航信号设计提供技术支撑。

随着新一代GNSS的迅速发展，各系统播发信号数量显著增加，卫星导航频谱资源日益紧张，而用户对信号性能的要求却在不断提升。通过导航信号体制设计，尤其是通过研发先进的扩频调制和星上恒包络复用技术来实现带宽受限条件下的高性能测距是新一代系统建设中的研究热点。近年来国内外对这一研究领域都很重视。本课题对多频调制与多路复用联合设计的理论与方法进行了深入研究。首先，我们研究了导航信号调制和恒包络复用联合设计问题，提出了一种基于正交基构造的多频联合复用框架，显著拓宽的恒包络复用所能适用的范围。在此基础上，对双频非对称调制复用一体化信号设计展开深入研究，取得了多项成果，其中一些技术被列为北斗全球系统下行信号备选方案，实现了本课题学术成果迈向国家工程应用的第一步。此外，还提出了多频联合调制复用技术性能评估方法和恒包络复合信号的分量联合接收技术，并完成了一部深入系统论述新一代GNSS信号设计的学术专著。本课题的研究对导航信号的调制复用一体化设计的理论与方法起到了一定的推动作用，并且研究成果确实为新一代卫星导航系统的信号体制设计提供了技术支撑。