Geomagnetic species space joint body and system for observation method

The present invention discloses a kind of space geomagnetic field observation method and a joint body system, the method comprising: measuring geomagnetic field before the task carried out by the magnetic-field information acquired mobile earth stations, determining the model parameters of the local geomagnetic field model; performing when the magnetic field measurement task, and the geomagnetic field model parameter information onboard the portion collected on the flight route, obtain the dynamic model along the flight route; attitude measurement while onboard the carrier aircraft flight section for a predetermined gesture error, the measurement error model obtained along the flight route; using the dynamic model and the measurement error model, the magnetic field to obtain an estimate on the flight path information acquired in the geographic coordinate system. The present invention can improve the measurement accuracy in the earth's magnetic field vector representing the geographic coordinates of the geomagnetic field and the abnormality detection can be performed.