邻近空间数字收发系统的设计与实现

发布时间：2018-08-02 21:27

【摘要】：邻近空间链路是深空通信行星网的重要组成部分,邻近空间无线收发系统的研究与设计对于邻近空间通信与深空通信网络的发展,以及我国对深空收发机的研究具有重要意义。本文在研究一般数字收发系统架构的基础上,依据CCSDS制定的邻近空间链路协议,结合邻近空间通信环境的特点,研究并设计实现了一套基于FPGA、DSP数字信号处理平台的邻近空间数字收发系统。研究与设计中,既包含了对经典的数字通信理论的分析,又兼顾了邻近空间通信链路协议的应用以及工程实现的创新。首先,在结合邻近空间通信系统要求的前提下,对整个系统方案与通信流程进行合理化设计,分别给出了发射机与接收机详细的理论推导、参数分析与设计过程。其次,通过仿真对比,分析了传统Costas环载波同步的原理,在分析相干解调原理引入相位模糊的基础上,结合邻近空间的通信流程和经典的鉴相方法,提出了利用分阶段鉴相实现无相位模糊的载波同步方法。通过仿真对比了查表映射法鉴相和CORDIC算法鉴相的性能优劣,给出了高效的无相位模糊的载波同步设计方案与实现电路的仿真结果。然后,依据常规的早迟门符号同步理论,结合仿真结果,提出了避免不稳定采样点的创新型设计方法,给出了完整的实现过程。同时基于经典的Gardner环定时同步理论,进行了设计与实现,结合实际的硬件系统,对比了改进型早迟门与Gardner环符号同步的性能。此外,利用巧妙的组合逻辑设计,对帧同步与提取电路进行了设计与实现,给出了设计过程和仿真结果。最后,本文对整个邻近空间数字收发系统进行了联合仿真,并结合硬件平台设计了系统化的测试环境。分别对发射机的输出信号以及数字接收中各个功能模块中的关键信号进行了观测,验证了本系统设计的正确性,满足了邻近空间通信协议的要求。
[Abstract]:The adjacent space link is an important part of the deep space communication planetary network. The research and design of the adjacent space wireless transceiver system is of great significance to the development of the adjacent space communication and deep space communication network, as well as the research on the deep space transceiver in our country. Based on the study of the architecture of the general digital transceiver system, this paper is based on the CCSDS system A set of adjacent space digital transceiver system based on FPGA and DSP digital signal processing platform is designed and designed, which includes the analysis of the classical digital communication theory and the application of the adjacent space communication link protocol. First, in the premise of combining the requirements of the adjacent space communication system, the whole system scheme and the communication process are rationalized, and the detailed theoretical derivation of the transmitter and receiver, the parameter analysis and the design process are given. Secondly, the principle of the traditional Costas ring carrier synchronization is analyzed by the imitation of the true contrast. On the basis of the analysis of coherent demodulation principle introducing phase ambiguity, combining the communication flow of adjacent space and the classical phase detection method, a phase ambiguity carrier synchronization method is proposed by phased phase discrimination. The performance of phase detection and CORDIC algorithm is compared by simulation, and an efficient non phase mode is given. The carrier synchronization design scheme and the simulation result of the realization circuit. Then, based on the conventional early sign synchronization theory and the simulation results, an innovative design method to avoid the unstable sampling points is proposed, and the complete implementation process is given. Based on the classic Gardner ring timing synchronization theory, the design and Implementation are carried out. With the actual hardware system, the performance of the symbol synchronization between the improved early late gate and the Gardner ring is compared. In addition, the design and implementation of the frame synchronization and extraction circuit are carried out with the ingenious combinatorial logic design. The design process and the simulation results are given. Finally, this paper makes a joint simulation of the whole adjacent space digital transceiver system and makes a joint simulation. A systematic test environment is designed with the hardware platform. The output signals of the transmitter and the key signals in each function module in the digital reception are observed respectively. The correctness of the design of the system is verified and the requirements of the adjacent space communication protocol are met.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN927
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本文编号：2160788