With the rapid development of Global Navigation Satellite Systems (GNSS), precise point positioning (PPP) has been widely used for positioning, navigation, timing (PNT), and atmospheric sensing. Currently, the demand for low-cost single-frequency hardware is increasing. However, open-source single-frequency PPP (SFPPP) software, in particular those that employ uncombined GNSS observations, is scarce. In view of this fact, we developed an open-source software, called Single-frequency Uncombined PREcise point positioning for Multi-parameter Estimation (SUPREME), which can process multi-GNSS observations collected from a low-cost single-frequency receiver. It can simultaneously estimate receiver coordinates, receiver clock offsets, zenith tropospheric delays, and ionospheric delays utilizing a least-squares filter. SUPREME is developed in the C/C++ computer language; thus, it has good portability and cross-platform capability. The formatted output is also beneficial for the post-analysis of results. We evaluated SUPREME using several experiments based on real single-frequency data, and the results indicate that it provides high accuracy and robust performance.

随着全球导航卫星系统（GNSS）的飞速发展，精确点定位（PPP）已广泛用于定位，导航，定时（PNT）和大气感测。当前，对低成本单频硬件的需求正在增长。但是，缺乏开源的单频PPP（SFPPP）软件，尤其是那些采用未组合的GNSS观测值的软件。有鉴于此，我们开发了一种开源软件，称为多参数估计的单频非组合精确点定位（SUPREME），该软件可以处理从低成本单频接收器收集的多GNSS观测值。它可以利用最小二乘滤波器同时估算接收器坐标，接收器时钟偏移，天顶对流层延迟和电离层延迟。SUPREME是用C / C ++计算机语言开发的；因此，它具有良好的可移植性和跨平台能力。格式化的输出也有利于结果的后分析。我们基于真实的单频数据，通过多次实验对SUPREME进行了评估，结果表明它具有很高的精度和鲁棒的性能。