基于连续相位调制的多波段联合导航信号模型研究

With the increasing number of satellite navigation signals, the compatibility in multiple satellite navigation systems and integrated positioning will become the key technology for the future navigation systems. Compared with multi-frequency navigation in L-band, the multi-frequency navigation with multi-band which becomes a hot research topic in combined navigation systems recently can further weaken the effect of observation error, shorten the ambiguity initialization time, and improve the positioning accuracy and reliability. In this project, we mainly research on configurable parameters modulation schemes using in multi-band, explore the feasibility of multi-h continuous phase modulation (multi-h CPM) as a multi-band general chip waveform, establish a signal model of multi-band combined navigation based on CPM, and evaluate the performance of the combined navigation signal. The study involves many research areas, such as chaotic spread spectrum, q-ary joint coded modulation, Turbo detection principle and navigation signal evaluation, and reveals the essence of q-ary joint coded modulation based on chaotic sequence. The research results can improve the accuracy, real-time and robustness of navigation systems, reduce the complexity of terminal equipment, enrich the existing signal detection mechanisms of receiver, expand the design methods of multi-frequency navigation signal structure, provide new ideas and feasibility demonstration for system design scheme of new generation Beidou, and lay the theory and technology foundation for popularization and application.

随着卫星导航信号数量的不断增加，多系统的兼容与联合导航定位势必成为未来导航系统的关键技术。与L波段多频导航相比，多波段多频导航可进一步削弱观测误差影响，缩短模糊度的初始化时间，提高定位精度及可靠性，是目前多系统联合导航的研究热点。本项目对多波段兼容且参数可配置的调制方案进行研究，探索多调制指数的连续相位调制（Multi-h CPM）作为多波段通用码片波形的可行性，进而建立基于CPM调制的多波段联合导航信号模型，最后对复合信号的性能进行评估。该研究涉及混沌扩频、多元编码调制、Turbo检测原理及导航信号评估等多个领域的理论方法，揭示基于混沌序列的多元联合编码调制信号的本质特征。该项目的完成，可提高导航定位精度、实时性及鲁棒性，降低终端的硬件复杂度，丰富接收机信号检测机制，拓展多频导航信号结构的设计方法，为下一代北斗信号体制的设计提供新思路和可行性论证，并为其推广应用奠定理论和技术基础。

随着卫星导航信号数量的不断增加，多系统的兼容与联合导航定位势必成为未来导航系统的关键技术。与L波段多频导航相比，多波段多频导航可进一步削弱观测误差影响，缩短模糊度的初始化时间，提高定位精度及可靠性，是目前多系统联合导航的研究热点。本项目旨在提高导航定位精度与可靠性，增强信号的鲁棒性与抗干扰能力，降低多波段接收机的复杂度以及提升RNSS的综合性能，探索多波段通用的复合导航信号结构，提出一种基于CPM调制的多波段联合导航信号模型。该研究涉及混沌扩频、多元编码调制、Turbo检测原理及导航信号评估等多个领域的理论方法，揭示基于混沌序列的多元联合编码调制信号的本质特征。该项目的完成，可提高导航定位精度、实时性及鲁棒性，降低终端的硬件复杂度，丰富接收机信号检测机制，拓展多频导航信号结构的设计方法，为下一代北斗信号体制的设计提供新思路和可行性论证，并为其推广应用奠定理论和技术基础。