  This paper presents SNK, a novel simulation platform designed to evaluate the
network performance of constellation systems for global Internet services. SNK
offers realtime communication visualization and supports the simulation of
routing between edge node of network. The platform enables the evaluation of
routing and network performance metrics such as latency, stretch, network
capacity, and throughput under different network structures and density. The
effectiveness of SNK is demonstrated through various simulation cases,
including the routing between fixed edge stations or mobile edge stations and
analysis of space network structures.
