Abstract:When multiple sets of photoelectric external measuring equipment are used to measure the ballistic trajectory in the missile experimental range, on the one hand, different equipment will cause position deviation during handover; on the other hand, when using the method of differential smoothing from the center of the position parameter to obtain the ballistic velocity and acceleration, there is the phenomena of jump and excessive noise. Both will cause the measured ballistic trajectory to be inconsistent with the actual flight trajectory, which is not conducive to the accuracy comparison with the internal measurement parameters. Aiming at the external measurement deviation caused by the handover of photoelectric external measurement equipment, this paper analyzes that the error is mainly composed of constant error, time misalignment error and random error, proposes a segmentation correction method for the position error of multi-station junction point, and uses the algorithm of polynomial fitting to smooth the velocity noise for further correction. Finally, the photoelectric external measurement data of the missile test is used to verify the method, the positional of polynomial fitting to the noise caused by the handover equipment is corrected, and the flight trajectory of the aircraft is well reproduced, which not only ensures the continuity of the trajectory curve, but also satisfies the smoothness of the trajectory.