基于新体制GNSS信号的模糊抑制捕获研究

With the development of GNSS, the BOC familly modulation and the TDDM modulation signals emerged in order to satisfy the anti-jamming, expansibility and usability of GNSS system. The new problems of acquisition technology were caused by the application of the new mechanism technologies, especially, the main peak ambiguity problem, the serious leakage acquisition and wrong acquisition ambiguity problems. Therefore, the research of new mechanism GNSS signal acquisition has been the new focus. Considering the deficiencies and limitations of existing acquisition algorithms in speed, precision, complexity and adaptability, the ambiguity suppression acquisition technologies will be research to overcome above problems. The ambiguity suppression acquisition algorithms including the key technology of correlation fitting function establishment, optimization correlation function establishment, adaptive threshold, general single peak establishment, impact factor matrix structure, relative priority dynamic matching, etc. will be established. The research will provide the theoretical support and technical foundation to the new development and application of GNSS system.

随着GNSS的不断发展，为提高系统的抗干扰、可扩展和可用性，出现了基于长周期伪码的BOC族调制、TDDM调制等新体制信号。正是由于新体制技术的应用，引发了以捕获为核心的接收技术新问题，尤其是捕获处理中主峰相位模糊、严重漏捕和错捕模糊等问题。为此，新体制GNSS信号的捕获新技术成为了研究的关键所在。本项目应对捕获的系列模糊问题，考虑现有方法在处理速度、处理精度、处理复杂度、适应性等方面存在的局限和不足，通过相关拟合方程建立、优化相关函数建立、自适应门限设置、通用单峰函数建立、相关影响因子矩阵构建、相关优先级动态匹配等核心应对机制，提出模糊抑制捕获算法。从而为GNSS的新发展和新应用提供理论支撑和技术基础。

应对GNSS中BOC族调制、TDDM调制等新体制信号而引发的捕获技术新问题，尤其是捕获处理中主峰相位模糊、严重漏捕和错捕模糊等问题，为此，开展了基于新体制GNSS信号的模糊抑制捕获研究。研究中，针对长周期伪码信号捕获中面临的时/频不确定问题，提出了改进的长周期伪码信号模糊抑制捕获算法，解决了处理复杂度大、处理速度慢、相关峰值低、漏捕及错捕模糊等问题。针对各阶数配置下的BOC族调制信号的自相关多峰特性，提出了三种BOC族调制信号模糊抑制捕获新算法，解决了主峰估计误差大、副峰抑制度低等问题；以及兼容捕获精度低、捕获模型通用性差等问题。鉴于TDDM调制技术中扩频伪码奇偶有别的调制机制，提出了两种TDDM调制信号的模糊抑制捕获新算法，解决了信息码奇/偶位的不同扩频机制引发的相关度低、严重的漏捕模糊等问题；以及信息码符号反转所引发的错捕获及时效性差等问题。本项目的研究成果将为GNSS的新发展和新应用提供理论支撑和技术基础，具有一定的科学意义及应用前景。