System and method for detecting pavement evenness based on multiple sensors

The invention discloses a system and a method for detecting pavement evenness based on multiple sensors. The system comprises a rigid detection beam, three displacement sensors, a gyroscope, a GPS and a rotary encoder, wherein the rigid detection beam is suspended at the bottom of the tail of an automobile or the front end of the automobile along the direction of the automobile body; the three displacement sensors are arranged on the rigid detection beam at intervals along the direction of the automobile body and used for obtaining the evenness of a pavement in a local range; the gyroscope is used for obtaining the attitude azimuth of the detection beam in the running process of the automobile; the rotary encoder is used for obtaining the travelled distance of the automobile; the GPS is used for obtaining the longitude, the latitude and the altitude of the automobile. The system and the method for detecting the pavement evenness based on multiple sensors have the advantages that small-wavelength detection on a vertical section under the conditions of variable speed and low speed is realized by use of the non-inertial vertical section detection theory of the small-step length standard transfer principle, meanwhile, large-wavelength accurate detection on the vertical section of the pavement is realized by use of a data fusion method of GPS elevation and gyroscope elevation, and full-wavelength accurate detection on the pavement is realized based on the small wavelength of the vertical section.