1. Durand JM, Caseau A (1990) GPS, availability, part II: evaluation of state probabilities for 21 satellite and 24 satellite constellations. Navig. J. Inst. Navig. 37(3):285–296
2. Quyen H (1997) Availability: what is availability? Availability of what? In: Proceedings of the national technical meeting 1997, Santa Monica, California, pp 831–838
3. Slattery R, Kovach K (1999) New and improved GPS satellite constellation availability model. In: Proceedings of ION GPS 1999, Nashville, TN, 14–17 Sept 1999, pp 2103–2112
4. Li G, Li J, Jiao W et al (2010) Analysis of PDOP availability of navigation constellation based on satellite service intermittence. Geomatics Inf Sci Wuhan Univ 35(7):841–845
5. Wang E, Zhang Q, Qu P et al (2017) GNSS constellation availability evaluation method based on Markov chain. Syst Eng Electron 35