基于循环平稳理论的L-DACS1系统接收机干扰抑制方法研究

L-band Digital Aeronautical Communications System 1(L-DACS1) is an important communications infrastructure for the next generation Air Traffic Management system (ATM). According to the frequency planning of the World Radiocommunication Conference in 2007, L-DACS1 will be operated as an inlay system between adjacent Distance Measuring Equipment (DME) channels. In a result, it is inevitable to bring about the problem that the Orthogonal Frequency Division Multiplexing (OFDM) receiver of L-DACS1 system suffers the interference of the DME signals. In order to cope with this key problem, the research group plans to carry out the following research. Firstly, the cyclostationarity property of the DME signals is studied based on the cyclostationary signal processing theory. Secondly, the interference mechanism of the DME to OFDM signals is investigated based on the cyclostationarity property of the DME signals. Thirdly, utilizing the differences of the cyclostationarity property between the DME and OFDM signals, the DME interference suppression method is investigated based on the adaptive cyclic wiener filter. The researchwill lay theory and technique foundation for L-DACS1 system deployed in the aeronautical radio navigation L-band.

L频段数字航空通信系统1（L-DACS1）是新一代空中交通管理系统的重要通信基础设施，根据2007年世界无线电大会的频率规划，L-DACS1系统将以内嵌方式部署在航空无线电导航频段测距仪（DME）系统波道间，由此产生DME信号干扰L-DACS1系统正交频分复用（OFDM）接收机的关键问题。为解决这一关键问题，项目开展三个方面研究，第一，以循环平稳信号处理理论为工具，开展DME信号循环平稳特性的研究；第二，以DME信号循环平稳特性为基础，开展DME信号干扰OFDM信号机理的研究；第三，利用DME与OFDM信号循环平稳特性的差异，基于自适应循环维纳滤波开展DME信号干扰抑制方法的研究。通过构建宽带航空数据链仿真和实验测试系统验证所提出方法的正确性。本项目研究将为L-DACS1系统以内嵌方式部署在航空无线电导航频段奠定理论与技术基础。

针对DME信号干扰宽带航空数据链系统1(L-DACS1)接收机的关键问题，本项目按照计划完成了L-DACS1中OFDM接收机的DME脉冲干扰抑制方法研究。首先建立了L-DACS1系统前向链路模型和信号模型；对DME干扰信号的时域、频域和循环域的特性进行研究，定量分析脉冲熄灭方法对OFDM系统信道容量及比特差错概率的影响；在此基础上提出了基于自适应循环维纳滤波、基于压缩感知、基于马尔可夫蒙特卡洛的Turbo迭代均衡检测方法等6种DME脉冲干扰信号抑制方法,仿真验证了其有效性；最后利用软件无线电开发设备和计算机终端构建了L-DACS1宽带航空数据链仿真测试平台，对L-DACS1系统前向链路发射机和接收机功能和DME脉冲干扰抑制算法性能进行测试验证。项目共发表学术论文10篇，其中SCI检索2篇，EI检索6篇；授权专利6项；出版学术专著1部。本项目研究成果为L-DACS1系统在未来民航通信领域的工程应用奠定了理论与技术基础。