Calibration method for three-beam laser velocimeter on basis of navigation system

A calibration method for a three-beam laser velocimeter on basis of a navigation system comprises the following seven steps: 1, installing an inertial unit, a differential GPS and the laser velocimeter on a carrier, and binding initial position parameters onto a navigation computer; 2, preheating a strap down inertial unit, and collecting the output data of a gyroscope and an accelerometer; 3, preprocessing the collected output data; 4, initiating the differential GPS and the laser velocimeter, allowing the system to switch into an SINS/DGPS mode from an alignment mode, and allowing the carrier to begin moving; 5, collecting the output of the velocimeter and the output of an SINS/DGPS combination navigation system when the carrier is in different motion states at different times; 6, respectively identifying the error of three installation angles and the scale factor of the laser velocimeter by a least square method; and 7, evaluating and analyzing the calibration precision. According to the invention, the accurate calibration of the three-beam laser velocimeter is realized through utilizing the characteristics of the strap down inertial unit and the combination navigation system that the output speed precision is high. Therefore, the calibration method has a practical value in the inertial navigation technology field.