This paper details the impact that a Low-Earth-Orbit (LEO) constellation will have on existing GNSS carrier phase ambiguity resolution. A LEO constellation was modelled to have 66 satellites at an altitude of 780km and was used together with GPS satellites to conduct a global covariance simulation and evaluate the performance of a combined low- and medium-earth orbit system compared to GPS alone. The LEO satellites were found to improve how quickly the system could reach 99.9% probability of correct fix by a factor of 2.4 on average. Additionally, a detailed look at an example where a LEO satellite disappears early in the dataset emphasizes how strongly the system can be affected by the fast-changing geometry of a single LEO satellite. Overall, this leads to the conclusion that current GNSS systems will be well complimented by future LEO GNSS, and that LEO satellites will be beneficial to positioning applications without requiring full global coverage with redundancy.
Simulation of the Impact of Low-Earth-Orbit GNSS on Carrier Phase Ambiguity Resolution
2025-04-28
1498623 byte
Conference paper
Electronic Resource
English
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