Precise Point Positioning Library (PPPLib) is a multi-GNSS data processing software designed to process multi-frequency data from GPS, BeiDou, Galileo, GLONASS, and QZSS. PPPLib is written in the C/C++ programming language. It can compile and run on both Linux and Windows operating systems. PPPLib mainly performs precise point positioning from single to triple frequency based on either ionospheric-free or uncombined observations. Moreover, it solves for abundant parameters, including position, tropospheric delay, ionospheric delay, and ambiguity information. Useful scripts and visualization tools are also provided for data download, batch processing, or solution presentation. We give a preliminary review, including positioning accuracy and convergence time of PPP using dual-frequency, ionospheric-free from single system to multi-GNSS, to show the working status of the current version of the software. In addition, the software also supports post-processing kinematic mode and INS/GNSS loosely coupled mode for kinematic positioning.

精确点定位库（PPPLib）是一款多功能GNSS数据处理软件，旨在处理来自GPS，北斗，伽利略，GLONASS和QZSS的多频数据。PPPLib用C / C ++编程语言编写。它可以在Linux和Windows操作系统上编译并运行。PPPLib主要基于无电离层观测或非组合观测来执行从单频到三频的精确点定位。而且，它解决了丰富的参数，包括位置，对流层延迟，电离层延迟和模糊信息。还提供了有用的脚本和可视化工具，用于数据下载，批处理或解决方案演示。我们进行了初步审查，包括使用双频，无电离层的PPP定位精度和收敛时间，从单系统到多GNSS，显示软件当前版本的工作状态。此外，该软件还支持后处理运动学模式和INS / GNSS松耦合模式以进行运动学定位。