How to get raw data of a rangefinder from APM 3.5.5


My team has been running multiple tests on a Lidar Lite V3 rangefinder, and we have reason to suspect that the ArduCopter (3.5.5) software is doing some smoothing on the data from the rangefinder. For our tests, we need the raw data that comes from the sensor.

After looking through the ArduCopter parameters, we disabled the Extended Kalman Filtering parameters, but this did not change the results we are getting from the rangefinder.

Does anybody know what other parameters are responsible for this smoothing? Does anybody know if there are some places in the source code that do smoothing for the data?