Ultrahigh frequency target vibration feature extraction method

The invention discloses an ultrahigh-frequency target vibration feature extraction method, relates to the technical field of laser coherent vibration measurement, and solves the problem that the extraction accuracy of target vibration information of a laser ultrahigh-frequency vibration measurement system still needs to be improved. The method comprises the following steps: calculating a phase error gain factor according to an amplitude deviation between an in-phase carrier signal I of a baseband signal and an orthogonal carrier signal Q of the baseband signal, a deviation between I and an ideal carrier signal frequency, and a deviation between Q and an ideal carrier signal frequency; and target vibration information is obtained by using the target vibration information compensation algorithm model containing the phase error gain factor. Quantitative compensation is carried out on phase errors caused by amplitude and frequency deviation, the influence of non-uniform modulation of two paths of carriers on demo