PNAVSIM is a package for numerical investigation of pulsar navigation.It contains a number of methods and algorithms for the simulation purpose in navigation.The photon-level integrated simulation model can be built easily based on the PNAVSIM library.The toolkit API can also be conveniently used by the developer in his own program.Functions are packed into modules at different levels.The top-level modules dealing with the spacecraft orbit dynamics,the pulse signal time delay,and the navigation algorithms are introduced.The structure of the PNAVSIM package makes it possible for developers to build simulation models flexibly and quickly,which enables more efficient applications of pulsar navigation.
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