SAR satellite simulated on-orbit load data obtaining system and obtaining method

The invention relates to an SAR satellite simulated on-orbit load data obtaining system and obtaining method. According to SAR satellite imaging parameters, SAR echo data is manufactured and is stored in a task planning computer; a navigation signal simulator and an attitude and orbit control ground equipment synchronically output on-orbit simulated flight relevant excitation to an SAR satellite to execute the simulated on-orbit flight; an imaging planning instruction is sent to the SAR satellite; an imaging mode, radar work parameter information, imaging moment, imaging duration, imaging process attitude information and load data downloading moment are transmitted to the SAR satellite. When the preset SAR satellite imaging moment is reached, an echo signal is sent to the SAR satellite; the SAR satellite packs formed load data; when the preset SAR satellite load data downloading moment is reached, load data receiving equipment receives a load data signal sent by the SAR satellite; demodulation receiving and r