CAPS多载波调制信号传输模型研究

The depth integration of navigation and communication is a major scientific development problem in the construction of national PNT system, transmitting satellite navigation system based on communication satellite (CAPS) is a novel development direction to explore new satellite navigation system theory. There is an important scientific problem for satellite navigation communication system including CAPS which is to improve utilization rate of bandwidth resources, navigation accuracy and communication performance. According to the characteristic of rich satellite transponder bandwidth resources in CAPS, we design to broaden current signal frequency bandwidth, break through signal model of single carrier modulation in current satellite navigation system. We will carry out wideband multi-carrier modulation of CAPS signal research on the navigation and communication performance from theoretical analysis, signal transmission simulation and modeling and signal test between satellite and ground, construct multi-carrier modulation signal transmission model of CAPS; analyze pseudo-range measurement error based on PAFP (physical precision enhancement factor) value when the pseudo-range is measured under CAPS multi-carrier signal modulation model and construct function; carry out study of optimum design sub channel allocation of CAPS multi-carrier modulation navigation and communication signal transmission model and form a signal transmission model with the characteristic feature of depth integration of navigation and communication, which will provide a certain degree reference in dual-use satellite navigation and communication system, space/deep space navigation, astrometry and other relevant fields.

导航通信深度融合是国家PNT体系建设的重大科学发展问题，基于通信卫星的转发式卫星导航系统（CAPS）是探索新型卫星导航理论体系的发展方向之一。提高频带资源的利用率，改善导航精度和通信性能是卫星导航通信系统包括CAPS面临的一个重要科学问题。本项目根据CAPS系统具有丰富卫星转发器频带资源的特点，构思拓宽信号频带，突破目前卫星导航系统单载波调制的信号模型，从理论分析、信号传输建模、模拟仿真及生成信号实验测试开展CAPS信号宽频带多载波调制在导航和通信性能上的研究，构建CAPS多载波调制信号传输模型；分析CAPS卫星多载波测量伪距时，PAFP（物理精度增强因子) 值对伪距测量误差的影响，构建函数关系；优化CAPS多载波调制导航和通信子信道分配，形成具有导航通信深度融合特色的信号传输模型，为军民两用的卫星导航通信系统、空间\深空导航、天体测量等领域提供一定程度的研究参考。

基于通信卫星的转发式卫星导航系统（CAPS）是卫星导航理论体系科学发展的创新方向之一，根据CAPS具有宽频带的技术特点，将卫星频点进行载波分组划分，通过空域滤波处理不相关的特性，构建转发式卫星多频点多载波下行的信号模型，根据配对载波之间导频的接收特点，可以实现导航与通信深度融合。本项目重点研究CAPS多载波调制信号传输模型的关键技术，主要研究内容包括：1）扩频测距码研究；2）信道传输分析研究；3）多频跳频导航研究；4）研究多载波测距精度与信噪比增益；5）多载波PAFP（物理精度增强因子）；6）导通一体化接收基带快速捕获模型；7）优化CAPS多载波调制导航和通信子信道分配模型；8）CAPS多载波伪码测距； 9）CAPS载波相位测量；10）CAPS多载波信号模型。本项目的研究成果已作为CAPS第三阶段转发式抗干扰试验验证与原理演示系统的换频导航模式的信号传输模型，为卫星导航与通信的融合发展提供了良好的参考价值，尤其在目前多网融合的科技发展方向中具有重要意义。