Abstract：With the developments of satellite, radio communication, and computer technology, autonomous operation of satellite navigation system becomes more and more important. Inter-satellite Link (ISL) is a key technology. The Walker constellation structure, and its categories, frequencies and rules of intersatellite links are introduced.Besides, the construction method and visibility of intersatellite links of Walker constellation are analyzed and then, the azimuth, elevation, and range are computed as well. Study shows that multiple ISLs can be built in Walker constellation.
