海量GNSS数据产品的一站式快速获取方法

One-stop rapid acquisition method of massive GNSS data products

全球卫星导航系统(GNSS)数据产品广泛应用于位置服务、灾害防御、地壳运动分析等领域。随着产品质量和精度不断提高,数量呈现海量增长,类型及数据源更加丰富多样,应用更加频繁。传统GNSS数据产品获取方式因仅支持文件传输协议(FTP)、数据源单一、产品获取效率低、软件功能不全面等缺陷,越来越难以满足需要。针对已有获取方式的不足,设计了多线程并发和断点续传算法,研发出一套同时支持FTP和加密超文本传输协议(HTTP)双协议、多全球数据中心和多种GNSS数据产品一站式快速获取的软件。通过测试分析,该软件具有良好的可靠性、高效性、鲁棒性和可移植性,既可大幅提高GNSS产品获取效率,又能同时保证产品质量,已在自然资源部大地测量数据处理中心相关科研及生产中得到了广泛应用。

Global Navigation Satellite System(GNSS) data products are widely used in areas such as location services,disaster prevention, and crustal movement analysis. With the continuous improvement of product quality and accuracy, the quantity has shown a massive increase, the types and data sources are more abundant and diverse, and the applications are more frequent. Traditional GNSS data product acquisition methods have defects such as only supporting File Transfer Protocol(FTP),single data source, low product acquisition efficiency, and incomplete software functions, making it increasingly difficult to meet needs. Aiming at the deficiencies of the existing acquisition methods, this paper designs a multi-threaded concurrency and resumable transmission algorithm, and develops a set of dual protocols that support FTP and encrypted Hypertext Transfer Protocol(HTTP), support multiple global data centers and multiple GNSS data product one-stop quick acquisition software.Through testing and analysis, the software has good reliability, high efficiency, robustness and portability, which can greatly improve the efficiency of GNSS product acquisition and ensure product quality at the same time. The software has been widely used in the related scientific research and production of the Geodetic Data Processing Center of the Ministry of Natural Resources.