An RBRconcerto Alti has a RBRalti sensor which outputs distance and echo timing. Only distance is reported by the RBRconcerto.
Full, in-situ derivation of distance from echo timing requires an average speed of sound over the path used by the sound.
Distance is a 'pure' derived parameter which has its own channel assigned to it, but there is no underlying measurement hardware for distance itself; it simply uses the outputs of the echo timing channel and the average speed of sound setting. This makes its specification rather sparse: there are no coefficients in either of the 'c' or 'x' groups; all that is needed is to specify the indices in the 'n' group.
In our example:
The distance is calculated as follow:
where
Example commands:
>> calibration 1 type |
( Confirm the channel type )
>> calibration 1 << calibration 1 type = alti00, datetime = 20130401120013, n0 = 2, n1 = value |
( Request confirmation of everything )