Dynamic deflection obtaining method based on angles

The invention discloses a dynamic deflection obtaining method based on angles. The method includes the following steps of firstly, measuring the movement speeds, in the axis directions of Doppler velocimeters, of corresponding road surface measurement points relative to the Doppler velocimeters, measuring the common rotating angular speed of the Dopler velocimeters, and measuring the movement speed of a dynamic detection device in the driving direction of a detection vehicle; secondly, obtaining an included angle, produced due to the rotation of the load beam, between a load beam and the road surface; thirdly, obtaining the road surface deformation speeds of the measurement points corresponding to the multiple Doppler velocimeters in a deflection basin; fourthly, setting up a corresponding deflection basin slope equation set; fifthly, solving the deflection basin slope equation set to obtain defection basin slope equation parameters, and thereby obtaining dynamic deflection values of the defection basin road section. According to the method, under the conduction of the high-frequency measurement points and the sampling with various intervals, continuous dynamic defection measurement results are provided, and the comprehensive evaluation of the road section can be more accurate and credible.