This paper focuses on the challenges of the configuration of a single constellation and the number of visible stars cannot simultaneously meet the requirements of high accuracy and high a-vailability in low orbit constellation opportunistic signal navigation.Based on the orbital parameters of the Iridium and the Starlink,this paper established single constellation models and hybrid constellation models,explored the coverage multiplicity,the coverage rates for each con-stellation,and the visibility of aircraft to the aforementioned constellations.The research results indicate that the number of visible satellites during aircraft flight decreases with the increase in flight altitude and decreases with the increase in flight angle of elevation.The fusion of the Star-link and Iridium constellations increases the number of visible satellites during aircraft flight at dif-ferent latitudes,especially in areas above 60 degrees of north latitude.Iridium achieved 100％full coverage at different latitudes and time around the world.Since its launch,the coverage area of Starlink satellites has gradually expanded towards the North and South poles,and the coverage rate has gradually increased.The maximum coverage multiplicity of Starlink in the world is 56,and the minimum coverage multiplicity is 0.And Starlink has not yet achieved 100％coverage rate at different latitudes and throughout the entire time.But the coverage rate of Starlink in China re-gion is better than that in the United States.The fusion of Starlink constellations and Iridium con-stellations helps the global coverage multiplicity be greater than 10,with a coverage rate of 100％at different latitudes and times,significantly superior to a single constellation.
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