Research on Delay Control Parameters Error and Leading Simulation Method for GNSS Satellites Link Emulator

This paper tries the first attempt in GNSS related fields, the signal emitted by four different static navigation satellites on the ground, passed the latest self-research four-channel navigation satellite link emulator, which emulating the relative motion between the satellite and the user, and adding signal transmission channel time-varying parameters (group delay, phase shift, Doppler, fading), finally, the navigation receiver receives signal to complete positioning. Essence of satellite navigation and positioning is aligning the satellite and user time, and measuring signal transmission delay. This paper has established the positioning principle model based on four-channel satellite link emulator, designed the positioning implementation process, analyzed the errors generated model, proposed a delay parameters leading simulation control method. The measured results show that it could effectively reduce the positioning error caused by the navigation satellite channel emulator. It provides an effective way to fully verify its signal performance indicators, before the navigation satellite launched.