| Citation: | XU J M，HUANG Z G，LI R. LEO satellite positioning method and simulation verification aided by airborne navigation equipment[J]. Journal of Beijing University of Aeronautics and Astronautics，2024，50（10）：3230-3238 （in Chinese） doi: 10.13700/j.bh.1001-5965.2022.0759
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Global navigation satellite system (GNSS) is easy to be deceived and jammed in a complex electromagnetic environment, while the low earth orbit (LEO) integrated communication and navigation satellite system has the advantages of high landing power and rapid constellation geometry changes, and it is a good emergency backup navigation source. However, most of the LEO satellite systems only have 1–2 satellites visible in the middle and low latitudes, which fail to realize real-time dynamic positioning. Therefore, a combined positioning algorithm based on airborne inertial navigation system (INS) and barometer assistance was proposed. The INS and barometer were used as pseudolites, and the problem of insufficient observability was solved by configuring atomic clocks. The algorithm used the LEO satellite observation data to correct the error of the INS. At the same time, an estimability index was proposed to measure the stability of the filter for solving the problem that the observability cannot be quantitatively analyzed. The simulation verification shows that the algorithm uses the LEO observation data to reduce the INS error by about 60% within nine minutes, and the positioning error can reach up to 50 meters, realizing real-time stable positioning. The proposed estimability index can measure the stability of the system.
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