Using Soft Landing SINS ground test method for obtaining the initial posture

The present invention discloses a soft landing ground test using lunar strapdown inertial navigation method for obtaining the initial posture, the probe belongs to the field of the Moon. The particular method steps: first set fixed orientation test site in the vicinity of the mirror, the mirror orientation as an intermediate conversion to obtain a test control test site coordinate system with respect to the posture of the Northeast days coordinate transformation matrix; followed by test site observation point the geographic latitude, obtaining test site coordinate system relative to day Northeast geocentric coordinate system transformation matrix to obtain a control test with respect to the coordinate conversion matrix C6 geocentric coordinate system, the attitude finally obtained T0 is the initial time Q0 quaternion : from the initial time T0, the outer gyro measurement data push gesture; obtaining the k-th control cycle posture Qk, Qk outer pose real-time output until the test is complete begins to push landings, as in this case the test Qk an initial attitude. The present invention is applicable to a ground test moon landing.