Pavement smoothness detection device based on multiple sensors

The utility model discloses a pavement smoothness detection device based on multiple sensors and a pavement smoothness detection method based on multiple sensors. The detection device comprises a rigid detection beam, three displacement sensors, a gyroscope, a global positioning system (GPS) and a rotary encoder, wherein the rigid detection beam is hung at the bottom of the tail of a car or the front end of the car along a car body; the three displacement sensors are arranged on the rigid detection beams at intervals along the car body and used for acquiring the pavement smoothness within a local range; the gyroscope is used for acquiring the attitude azimuth angle of the detection beam in a driving process of the car; the rotary encoder is used for acquiring the mileage of the car; and the GPS is used for acquiring the longitude, latitude and attitude of the car. According to the detection device disclosed by the utility model, on the basis of a non-inertial profile detection theory of a small-step benchmark transfer principle, small-wavelength detection of a profile under variable speed and slow speed conditions is realized; meanwhile, by virtue of a method of data fusion of GPS elevation and gyroscope elevation, precise detection of the pavement profile in a large wavelength is realized, and in combination with small wavelength of the profile, precise detection of the pavement in a full wavelength is realized.