Furuno data files

Echoview supports data files from these Furuno echosounders:

FQ80 Data files

Supported file types

Echoview does not directly support .hacorg files logged by FQ80 echosounders. It supports .hac files that are created from these files by Furuno's FQ80 Analyser software (see Furuno FQ80 Analyser documentation for more information).

The following FQ80 files types are supported.

File type

Description

PingAn01.hac

Mechanical angle pings

SCSVn06.hac

Sv small-cell pings

SSVn03.hac

Sv pings

TSn04.hac

Single target detection pings

Where n = channel number

Pos.hac files (GPS positions) are also supported but cannot be added to a fileset directly. Echoview will look for a pos.hac file in the Position folder when any of the files types listed above are added to a fileset. If a pos.hac file is found, Echoview will derive a position GPS fixes variable which can be viewed as a cruise track.

Support for other FQ80 file types is being considered for inclusion in future versions of Echoview. Please contact Echoview support to discuss your requirements.

Folder structure

Echoview requires that data files are stored in the folders to which they were written by the FQ80 during logging, i.e. for any root folder, the following folders must exist:

Note: Echoview and associated programs do not support the use of some international character sets. If any folders in the filepath contain characters other than Latin alphabet characters, you should rename the folders. See International character support for more information.

File names

Echoview will look for files using their default file names (see above). Do not change file names or Echoview may not read the file at all or may read it as an incorrect file type.

Adding data files to a fileset

The Furuno FQ80 stores and names data files quite differently to any other supported echosounder. As a result, you cannot add data files to a fileset in the same way that you would for files from other echosounders. Two rules apply to adding FQ80 files to a fileset:

Note: Although you can only add data files from the folders listed above, Echoview requires that certain files be present in other folders. For example, you cannot add a file from the Ping folder to a fileset unless a file of the same name (excluding channel number) exists in the Channel folder and Echo folder. The required files will have been written during logging and must not have been renamed or moved out of the folder to which they were written.

See Adding and removing data files for general information about adding data files to a fileset.

Time resolution of pings

The transmit time for pings is stored at a resolution of one second. If the transducer's ping rate was greater than one ping per second during logging, multiple pings are assigned the same transmit time. Echoview requires that all pings have a unique transmit time and will shift transmit times as required. Echoview will shift each duplicate transmit time by 0.1 of the ping interval value read from the fff.hac file in the Echo folder (where fff is the same filename as the data file from the Ping folder that was added to the fileset).

Values used in calculations

The following information is presented as a reference. You do not need to be familiar with this information in order to make use of your data.

Sound speed

The sound speed value used in any calculations will be the value read from the fff.hac file in the Echo folder (where fff is the same filename as the data file from the Ping folder that was added to the fileset).

Sample thickness

For a file fff.hac in the Ping folder that was added to a fileset, the sample thickness value used for ping geometry and other calculations will be calculated by Echoview as follows:

sample thickness = c / f / 2

Where:

c = sound speed (read from the fff.hac file in the Echo folder)
f = channel sampling frequency (read from the fff.hac file in the Channel folder)

The sample range value from fff.hac file in the Echo folder (where fff is the same filename as the data file from the Ping folder that was added to the fileset) is not used.

Pulse duration

The pulse duration used in calculations will be calculated by Echoview. See FQ80 Pulse duration for more information.

ETR-30N data files

Supported file types

Echoview supports ETR-30N data files with the following naming system:

TTYYYYMMDDhhmm.bin

Where:

TT identifies the type of data stored in the file and is one of:
      
HF
for high frequency Sv ping data
LF
for low frequency Sv ping data
LL
for position data
PhHF for high frequency phase data
PhLF for low frequency phase data
YYYYMMDDhhmm identifies the date and time of data logging as follows:
 
YYYY:
year
MM:
month
DD:
day
hh:
hour
mm:
minute

Calibration of Sv variables

Sv values from ETR-30N Ping data files are calibrated (in the file). Echoview provides the option of applying a calibration offset is desired.

See About calibrated data for more information.

Values used in calculations

The following information is presented as a reference. You do not need to be familiar with this information in order to make use of your data.

Sample thickness

The sample thickness value used for ping geometry and other calculations will be calculated by Echoview as follows:

sample thickness = c / f / 2

Where:

c = SoundSpeed, as entered on the Calibration page of the Variable properties dialog box
f = SamplingFrequency, as entered on the Calibration page of the Variable properties dialog box

Furuno FCV-30 data files

Echoview supports Furuno FCV-30 data written by the instrument in a .hac format. Echoview reads the tuples that include the Ping U-32 tuple, Ping-32-16 angles tuple and standard HAC version 1.0 Standard navigation tuple (30). Single target data can be achieved using the Echoview operator called Single target detection - Furuno FCV-30. This operator finds Furuno single targets in processed compensated TS data output by the Furuno FCV-30 sounder.

In addition, a proprietary Furuno beam compensation model is available for use with Echoview's Single target detection - split beam (Method 1 and Method 2) operators. For more information about the Furuno beam compensation model please contact Furuno.

Furuno FCV-38 *.nc data files

Echoview reads *.nc data files recorded by the Furuno FCV-38 split beam echosounder to the ICES SONAR-netCDF4 file format. Equations for power, TS, SV and angular position are derived from Furuno FCV-38 equations. File reading and echogram display times may be lengthy for large data files.

Furuno FSV-25 *.nc data files

Echoview reads ICES SONAR-netCDF4 file format *.nc data files recorded by the Furuno FSV-25 scanning sonar. Echoview can read 3dB beam angle values if they are recorded in the data file, however if the angles contain NAN values, the angles are not used by Echoview. Equations for power, TS, SV and angular position are based on Type 2 conversion equations intended for data recorded by Furuno omnisonars. File reading and echogram display times may be lengthy for large data files.

Echoview calculates the tilt and bearing for beam 0, and applies it to the remaining beams. The ICES netCDF sonar beam coordinate system uses the same conventions as the netCDF4 platform coordinate system but with the origin (0,0,0) at the transducer (Figure 1 of the ICES netCDF document). See also Transducer location, Fixed/Mobile Platform.

Tilt (degrees) = arcsin(beam_direction_z)

Bearing (degrees) = arctan(beam_direction_y/beam_direction_x)

Notes:

Furuno FSV-30R (Research version) *.fsv data files

Echoview reads *.fsv data files recorded by the Furuno FSV-30R. These files may contain GPS data, heading data and acoustic data in V-mode, H-mode or S-mode.

The raw Sv variable data can be exported to the *.nc file format that can be added to a fileset.

Instrument specific features are as follows:

Notes:

See also

Raw variables derived from Furuno data files
Calibration settings for Furuno FQ80 data
Calibration settings for Furuno ETR-30N data
Calibration settings for Furuno FCV-38 data
Calibration settings for Furuno FSV-25 data
Calibration settings for Furuno FSV-30R data