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How Does a GNSS Receiver Work?
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With the continuous development of Global Navigation Satellite Systems (GNSS), Europe's Galileo system has become a leader among them. At present, the number of available satellites in orbit for the Galileo system has reached 28, with the capability of global precision positioning. Especially, all satellites are capable of broadcasting multi frequency signals, which provides broad prospects for further optimization of precision single point positioning (PPP). This article introduces a study based on Galileo three frequency non combination PPP and demonstrates its significant progress in phase fractional deviation (FCB) estimation and ambiguity resolution (AR).
The multi frequency signal characteristics of the Galileo system give it significant advantages in PPP ambiguity fixed solution performance. The fusion of multi frequency signals can not only improve the accuracy of positioning, but also greatly shorten the convergence time. The research team conducted a detailed analysis using data from 155 globally distributed ground tracking stations, and the results showed that the standard deviation (STD) of the FCB estimation sequence on a single frequency was better than 0.04 weeks, indicating that the method has extremely high accuracy in handling signal bias.
In the process of precise single point positioning, the convergence time of the dual frequency PPP floating-point solution in the E, N, and U directions is 32.0 minutes, 10.0 minutes, and 43.5 minutes, respectively. When using the dual frequency PPP fixed solution, the convergence time is reduced to 30.5 minutes, 8.5 minutes, and 32.0 minutes. What is even more exciting is that the convergence time of the fixed solution of the three frequency PPP has been further shortened to 16.5 minutes, 8.0 minutes, and 2.0 minutes. This progress means that in practical applications, the efficiency and accuracy of positioning have been greatly improved.
The multi frequency signal fusion technology of the Galileo system has not only made significant breakthroughs in precise single point positioning, but also provided new possibilities for applications in other fields. This technology has broad application prospects in fields such as autonomous driving, precision agriculture, geological monitoring, and intelligent logistics. Especially in scenarios that require high precision and fast positioning, multi frequency PPP technology will become an indispensable tool.
With the continuous improvement of the Galileo system and the continuous development of multi frequency signal technology, we have reason to believe that future positioning technology will become more accurate and efficient. Researchers will also continue to explore more innovative applications and improvement methods based on this foundation, providing users with more reliable location services.
Overall, the multi frequency signal technology of the Galileo system has brought revolutionary changes to precise single point positioning. Through the research in this article, we have seen its enormous potential in improving positioning accuracy and shortening convergence time. This is not only a significant advancement in GNSS technology, but also an important milestone for future navigation and positioning services. We look forward to the Galileo system providing powerful technical support for more fields in the near future, helping various industries achieve more efficient and intelligent development.
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