Beam_volume_sum

This analysis variable calculates the sum of the volumes of the analysis domain that were sampled in each ping. Beam_volume_sum can be used for single target analysis. Refer to Beam angle parameters for information about adjusting the Equivalent two-way beam angle for single target analysis.

The beam volume of a single ping within the analysis domain is calculated as:

   

where

psi
= the two-way beam angle (steradians) 
n 
= the number of boundaries, Ri, crossing the ping (-). See illustration below.
delta i =  
0 if the interval between Ri and Ri+1 is in the analysis domain and:
  1. is above an Exclude above line
    and/or
  2. is below an Exclude below line
    and/or
  3. contains no-data samples and Include the volume of no-data samples is not selected
    and/or
  4. is within a bad data (no data) region and Include the volume of bad data (no-data) regions is not selected

Note: No-data samples may occur in a number of ways (no-data samples, samples within
applied bad data (no data) regions and samples in pings with a bad line status).
For further information refer to About analysis domains: Analysis based on regions and samples.

 
 
1 otherwise, including below threshold data
R0
= the range (measured along the beam axis of the ping) to the first sample in the analysis domain (m)
Rn

= the range (measured along the beam axis of the ping) to the last sample in the analysis domain (m)

Note: Generally, for Single target analysis, the setting Include the volume of bad data (no-data) regions should be unselected.

In the example below the samples in the ranges (R1 to R2), (R3 to R4), and (Rn-2 to Rn-1) are part of bad data regions and the volume of the beam in these ranges will not be included in the overall beam volume for the ping. The red hatching marks the samples which were analyzed - see analysis hatching for details.

The sum of the beam volumes of all pings in the analysis domain is calculated as:

where:

     N     = The number of pings in the analysis domain being analyzed

     Vp    = The volume of ping p - as above (m3)

Notes:

See also

Samples
About analysis domains

Wedge_volume_sampled

About single targets: Analysis
Beam angle parameters