58 User’s Manual Innomar SES Parametric Sub-bottom Profilers
58 Innomar Technologie GmbH (2020-09)
General – Input String / Mode: Here you can adapt the navigation input of the INNOMAR system
to the navigation data format of the GNSS receiver used.
NMEA compatible: the incoming navigation data have a NMEA compatible format. (Data string
starts with “$” character and ends with “CR” (carriage return); data positions are comma sepa-
rated)
Space separated: the space character (0x20) is used to separate data positions.
Absolute positions: fix start positions (character number) and length of the substrings.
Multiple Header: similar to NMEA compatible, but the “$” character is not required at the begin-
ning of each data string.
General – Headers: In NMEA Compatible and Multiple Header modes up to four different NMEA
sentences can be recognized by the SESWIN software. The NMEA sentence IDs to be recog-
nized have to be set in the “NMEA1” to “NMEA4” boxes.
String Extraction
In NMEA Compatible and Multiple Header modes the required NMEA ID (address) for each sub-
string to be extracted has to be defined. If one of the incoming NMEA sentences has this ID, the
settings for position, offset and length are taken to extract the “SIS strings”:
Header: From the drop box select the NMEA sentence ID to be used.
Position: Number (logical position within the NMEA sentence) of the required value sep-
arated by comma (assuming the sentence ID has position 0).
Offset: Usually the first character after the separating comma is taken as start position for
string extraction (offset=0). Sometimes it is useful to apply an offset to start with another
character position, for instance to drop leading zeros because of the length limit for the
“SIS strings”.
Length: Number of characters that have to be extracted, counted from the start position.
It is also possible to extract automatically between commas (“,…,”).
It is also possible to extract more than one logical NMEA position into one “SIS string”. (Example:
To extract GNSS quality, numbers of Satellites and DOP value into one SIS string you could
define NMEA1=$GPGGA, Header=$GPGGA, Position=6, Offset=0, Length=8.)
For details on NMEA data formats please see appendix A.13 on page 185.
In Space Separated mode the following parameters have to be defined:
Position: Number (logical position) of the data to be extracted within the space separated
incoming data stream.
Offset: according to the description given above (see NMEA compatible)
Length: according to the description given above (see NMEA compatible)
In Absolute Positions mode the following parameters have to be defined:
Position: Absolute character (byte) position of the first character that has to be extracted
for the SIS string. To obtain the byte numbers you can use the SIS monitor.
Offset: according to the description given above (see NMEA compatible)
Length: according to the description given above (see NMEA compatible)
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