Example 16: distancefromechotiming distance from echo timing

An RBRconcerto³ Alti has a RBRalti sensor which outputs distance and echo timing. Only distance is reported by the RBRconcerto³. 

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:

• n0 is the index of the echo timing channel, 2 in this example,

• n1 is the index of the average speed of sound channel, value in this example, ie the default setting.

The distance is calculated as follows:

where

• Te is the echo timing (round trip) in milliseconds, value(n0).

• ASS is the average sound of speed, value(n1) (refer to "settings avgsoundspeed").

Examples

>> calibration 1 type
<< calibration 1 type = alti00

Confirm the channel type.

>> calibration 1
<< calibration 1 type = alti00, datetime = 20171201000000, n0 = 2, n1 = value

Request confirmation of all calibration coefficients.