In order to adapt to the modern railway development,improve the comfort of passengers,it is increasingly important to research the relationship between track irregularity and vertical acceleration.

In light of the fact that the vertical vibration acceleration is on the high side on the loaded double-deck container flat car, on the basis of the test results from operation on track, the causes to the acceleration being on the high side are analyzed from the angle of resilient vibration of the cars.

Two methods are presented to observe DSL respectively based on backscattering strength and vertical velocity.

With the estimation of the zero drift of accelerometer, the precision of the vertical velocity and height can be improved and the measurement of the acceleration can be got without zero drift.

The vertical acceleration is one of the most important corrections in the airborne gravimetry The accuracy of the vertical acceleration using GPS is first estimated based on analytical models, then three different routine approaches with GPS are analyzed and compared using the real data from one airborne eravimetry test, and some initial conclusions are draw

In principle, the vertical acceleration can be derived from the GPS position and velocity results by differentiation, but it is still too noisy as the final correcti.