Semi-physical simulation test method for dual-frequency satellite-based enhancement system

The invention relates to a semi-physical simulation test method for a double-frequency satellite-based augmentation system. The method comprises the following steps: calculating a navigation satellite position and a navigation satellite speed based on a broadcast ephemeris; calculating a real navigation star position according to the orbit correction model; based on the position of the user and the real navigational star position, an observed quantity is calculated; according to the clock correction model, calculating the clock correction error of the navigational star to obtain a corrected observed quantity; fitting the 10-parameter precise ephemeris according to the real navigation star position to obtain a 10-parameter broadcast ephemeris, and generating an enhanced information telegraph text; and issuing the enhanced information message and the corrected observed quantity to navigation signal source hardware to generate a simulation signal. According to the invention, the semi-physical simulation test sys