Measuring method for underwater navigation attitudes

The invention relates to an information measuring method and in particular relates to a measuring method for underwater combined navigation attitudes of a strap-down inertial navigation system/a doppler log by the doppler log under an underwater working mode when a submarine navigates underwater. The measuring method comprises the following steps of: connecting the strap-down inertial navigation system and the doppler log of the submarine; measuring the attitude value, the speed value and the position value of the submarine in a recursive manner; recording the speed value at a moment that the submarine starts diving; searching an east parameter beta x of an ocean current model and a north parameter beta y of the ocean current model within a navigation sea area; measuring the speed of the ocean current in the recursive manner; real-timely acquiring the water speed obtained by the doppler log; real-timely measuring attitude errors of the strap-down inertial navigation system; and measuring the accurate attitude value of the strap-down inertial navigation system. After compensating the speed of the ocean current, the measuring method provided by the invention improves the course error angle precision, the pitching error angle precision and rolling error angle precision in different degrees, and improves the combined navigation precision.