The information herein applies to the EM , EM , EM , EM , EM A datagram format for Sonar Head depth is provided for the EM , EM. Enquire about the The Kongsberg EM Multibeam Echo Sounder online today at Unique Group, wide range of Multibeam Echo Sounders available now. The EM is a new advanced multibeam echo sounder with extremely high resolution and dynamically focused beams. It is very well suited for detailed.
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Important Driver will stop updating if no C clock datagrams are received for more than 30 seconds. In DbSetup for this driver some driver specific settings can be entered.
FF Hex and 7F Hex, respectively. In order to activate the transmission, one should do the following: The drawing below shows a schematic overview of the acoustic center.
Backscatter, or raw seabed image intensity values, are stored in the S datagram. In order to obtain valid bathymetric results, the multibeam system and QINSy need valid speed of sound information. DbSetup example for Simrad Compact system. In order to be able to test the network connection it is advised to add a line to the ‘host’ file using the following format:.
Decoding Notes Driver will always output the decoded maximum number of beams with a maximum ofEM Choose one of the “Head II” systems to decode the beam data from the second transducer. The echosounder Stabilization is greyed out in the Database Setup because the output string already contains the information about whether the systems is stabilized or not.
The driver will correct the reported beam angles so they are valid for the acoustic center.
The Kongsberg EM 3002 Multibeam Echo Sounder
Only the beam numbers are different. If you want to decode the backscatter, see the Simrad EMx for more details. This is done to prevent latency related errors. This non-conformity will result in small depth independent depth errors at the outer beams.
Kongsberg EM (R-Theta Format) – 20
Kongsherg that choosing the valid flank is not very relevant for very short PPS pulses e. This pulse is half a second long so when the wrong active flank is chosen timing can be off by half a second.
It is important that the velocity entered is at transducer face depth when picking from a profile. D datagram for position of footprints C datagram to determine internal EM clock drift and offset.
For amplitude bottom tracked beams this value stands for the used number of samples while for phase bottom tracked beams this value stands for the “fit”. Invalid beams are restored to the MBE data buffer, with all values set to em300, except quality factor FFh and intensity 7Fh.
Kongsberg EM3002 (R-Theta Format) – 20
Acoustic Center is 1. F or f, D and R Runtime.
F datagram for raw ranges and angles C datagram to identify the serial number from the main head R datagram for raw bathymetry storage as of QINSy version 8 the offset from the clock telegram is no longer used for the EM In order to be able to test the network connection it is advised to add a line to the ‘host’ file using:.
Online When online, select the “Echosounder settings” option from the “Settings” menu to define the online blocking and filtering of the multibeam echosounder data.
The EM must send the following datagrams for correct decoding:. When online, select the “Echosounder settings” option from the “Settings” menu to define the online blocking and filtering of the multibeam echosounder data. Each head has beams starting with 1 at the port side of the matching transducer. Launch angle correction can be calculated by comparing the used sound velocity reported by the multibeam system with the actually measured sound velocity.
The EM manuals will mention the acoustic center to be in the geometric center of the transducer face but this is not exactly true: F datagram for raw ranges and angles D datagram for sampling frequency not included in F datagram C datagram to determine internal EM clock drift and offset. Real-time sound velocity fed into Multibeam Unit If the sound velocity can be interfaced real-time into the multibeam system then the beam angles that are reported by the system to QINSy are correct and no further angle correction is required.
When Enable the Water column data is decoded by the Driver. An EMD system must be configured in Database Setup as two single EM Multibeam systems that have a node position and unique mounting angles per transducer. In normal mode, the driver decodes the first beams from the telegrams, while with Head II option enabled, it decodes the second beams The decoded Quality Indicator QI can be considered a figure with a range between 0 and 64, where 0 stands for best quality.
The Beam angles that are reported in the F telegrams are valid in the receive array and not in the acoustic center.
Driver will stop updating if no C clock datagrams are received for more than 30 seconds. The Acoustic center is the point for which the node position must be entered into the QINSy database.
Acoustic center is 2. In order to activate the transmission, one should do the following:. These supersede the command line parameters. This means that the correct sound velocity value as obtained from the sound speed profile must be entered into the multibeam controller software.
For the TPU calculation the minimum steering angle can be defined. See description in Database Setup, except that the present QINSy driver is only meant for datagrams broadcast over a network, so instead of entering serial port parameters, the port number has to be entered. Only a limited number of packets will be stored: No real time sound velocity QINSy only supports beam angle corrections when a sound velocity probe is interfaced.
If the driver is started without the parameter it will start by default in Rho-Theta mode.
The letters following the port number are an indication of the datagrams, which are to be output on this port. Recommended Mode F datagram for raw ranges and angles Kongsberv datagram to identify the serial number from the main head R datagram for raw bathymetry storage as of QINSy version 8 the offset from the clock telegram is no longer used for the EM X-Y-Z mode D datagram for position of footprints C datagram to determine internal EM clock drift and offset “Raw-Data” D datagram is identical to ordinary D datagram except that some variables like for example the beam depression angle are now attitude-uncompensated launching angles.
QPS advises however to keep this enabled.
Data sheet – EM Multibeam echo sounder – Kongsberg Maritime
In order to activate this make sure to select the driver appropriate Driver Specfic Settings see below. This limitation is activated as soon as the first clock datagram arrives.
Refer to the GPS Manufacturer manual to see which is the active flank.