GNSS卫星导航信号畸变快速诊断与实时预警建模方法研究

项目名称： GNSS卫星导航信号畸变快速诊断与实时预警建模方法研究

项目编号： No.61501430

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 无线电电子学、电信技术

项目作者： 贺成艳

作者单位： 中国科学院国家授时中心

项目金额： 21万元

中文摘要： 全球导航卫星系统（GNSS）是集天文、物理、空间、信息、导航、测绘等技术于一体的现代高新技术，能为全球用户提供实时准确的位置、速度和时间等信息，目前已广泛应用于航空航天、海事、搜救、交通、精细农业等领域。卫星导航信号是GNSS的重要组成部分，导航信号质量的优劣将直接反映GNSS的PVT性能、有效载荷工作状态等。尽管GNSS在设计时非常重视可靠性，但信号畸变问题仍难以避免，严重时可能导致灾难性后果。由于涉及卫星导航、数理分析、信号处理、天体测量等众多领域，目前国内外尚未形成GNSS信号畸变自动识别及预警机制。为填补在该领域研究的空白，项目组提出GNSS信号畸变实时预警技术，并对其关键技术深入研究，以进一步提高预测预警的准确性及实时性，确保GNSS用户的高效可靠使用。研究内容主要有：1.GNSS信号畸变产生机理及特性 2.畸变对用户测距性能影响 3.畸变自动诊断与预警建模方法 4.模型误差分析

中文关键词： 卫星导航；信号处理；导航信号体制；信号设计；信号调制

英文摘要： Being the most advanced technology, Global Navigation Satellite System (GNSS) successfully gathers astronomy, physics, space, information, navigation, mapping and other technologies into one coherent system. GNSS can provide global users with accurate position, velocity and timing (PVT) information in real time. It has been widely used in aerospace, marine, search and rescue, transportation, agriculture and other fields. Satellite navigation signal is of vital importance for a GNSS to achieve its high performance, as signal quality will be a direct reflection of the PVT performance and payload status of a GNSS. Although GNSS reliability is highly respected and has attracted considerable attention in the design process, signal distortion is still difficult to be avoided, with severe cases leading to disastrous consequences. Since the project involves many areas of satellite navigation, mathematical analysis, signal processing, astrometry and so on, GNSS signal distortion automatic identification and real time warning mechanisms has not yet be formed both at home and abroad. To fill the gaps in this area, GNSS signal distortion fast identification and real time warning technology is proposed here. In addition, those key technologies are studied in depth to further improve the accuracy and real-time, ensuring efficient and reliable uses of GNSS. The main research contents in this project include: (1) GNSS signal distortion generation mechanism and characteristics; (2) impact of signal distortion on ranging performance; (3) modeling methods of signal distortion automatic identification and its real time warning; (4) model error analysis

英文关键词： Satellite navigation;Signal processing;navigation signal system;signal design;signal modulation