Setting up ethernet port should not be used if same subnet is used for both Qinsy and EMX!!!! EM D This echosounder uses pitch compensation and therefore it requires the serial input of an attitude sensor EM binary format. If no attitude sensor is connected then pitch compensation is not applied. All types of multibeam systems require the sound velocity profile but systems that utilize beam steering, usually systems with a flat array transducer, require the sound velocity at the head for the beam angle correction beam steering too.
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Port side maximum swath angle in degrees, angle are ref the vertical. This will determine the maximum coverage of the swath. Head1 Starboard Angle On a single transducer system this is the starboard side maximum swath angle, angle in degrees, ref the vertical. On a Dual head system this is the starboard max. Head2 Port Angle Dual Head system, starboard transducer, port side maximum swath angle in degrees, angle are ref the vertical. This will determine the overlap of the two heads around nadir.
Head2 Starboard Angle Dual Head system, starboard transducer, starboard side maximum swath angle in degrees, angle are ref the vertical. Port Coverage This parameter allow you to define the maximum swath width to port side by selecting values in meters. The port and starboard angles as defined above will then be adjusted accordingly by the system. To make use of these settings, you must set Angular Coverage mode to Auto. Starboard Coverage This parameter allow you to define the maximum swath width to starboard side by selecting values in meters.
Angular Coverage Manual: If Angular Coverage is set to manual, the values defined as Max port and starboard angle above in degrees are used directly. The Max coverage port and starboard settings in meters are not used in this case. Be aware that the outermost beams may be lost if the angular coverage set is larger than the coverage capability at the current depth. The most limiting of the two criteria will be used. If the system is not able to fulfill the above, it will reduce the swath width further and as a consequence nearly all the beams will be valid.
Beam Spacing Depending on the purpose of the survey, you may define the distribution of the beams on the seafloor. Equidistant: This setting gives a uniform distribution of soundings on the seafloor, and it is the normal mode for a bathymetric survey. Equiangle: The beams are distributed with an equal angular spacing based on the angular coverage used.
This gives many soundings close to the center of the survey line, and few on the edge of the swath. This is achieved by directing some of the beams closer to the center of the survey line and performing several soundings per beam on the edge of the swath. This results in an equidistant distribution of the soundings. Pitch Stabilization At open sea, the swath area on the bottom will move back and forth following the vessel pitch. This option should thus normally be ON. Ping Freq. Hz The ping rate is normally limited by the acquisition time two way travel time of the receive data plus a little overhead.
Dual swath if installed can be enabled to increase the along ship sampling rate. With the Max. Transmit Angle deg This function can be used to tilt the transmit sector forward and backwards. This can be used to avoid a too strong echo at the normal incidence Minimum Depth These parameters define the operational depth range.
This range should normally be wide enough to cover all depths encountered during the survey, as only depths within this range will be accepted by the system. A narrow range will help the system in bottom tracking under difficult conditions. In some cases it may be necessary to temporarily narrow the range to assist the system in bottom tracking. However, you must then monitor the actual depth closely, and adjust the depth window as often as required.
Maximum Depth These parameters define the operational depth range. Detector Mode Select detector mode to optimize the systems ability to recognize the bottom, wreck, structures, etc.
Select from: Normal: The normal bottom detection mode Waterway: Suitable for shallow channels and rivers Tracking: A general shallow water mode for tracking of targets and sudden depth changes Minimum depth: Designed for detecting wrecks etc. Slope Filter With this filter enabled, the system checks for bottom slopes that tilt inwards. These slant towards the vessel, and they are removed because the filter requires that the athwartships distance increases for every beam from the center.
Such detections are normally false, and after removal a new bottom detection is performed searching for a value with increased range. Aeration Filter If the transducer installation suffers from air bubbles close to the transducer, the system may have problems with bottom tracking.
Activating this filter will force the system to keep tracking the same depth for a longer period. If you have aeration problems in areas with relatively constant depths, this filter will increase the performance of the system. However, if the bottom depth varies considerably, the filter may have an adverse effect.
Sector Tracking Filter The transmitter operates with one, three or nine pulses within each ping. Each pulse covers different sectors of the total swath. This setting will turn on an automatic gain compensation to avoid amplitude offsets between these sectors. During normal operations, the Sector Tracking should be on. However, if the survey specifications demand a fully calibrated system for sidescan image, this function should be turned off. This setting does not affect the depth measurements, only the backscatter strengths.
Interference Filter If the vessel is equipped with other echo sounders on sonars operating on frequencies close to the echo sounder, you may experience interference.
The best solution is to synchronize the operation of the different systems. If synchronization is not possible, this filter may reduce interference problems. When the system detects the bottom, it will perform the search within a predefined depth window, where the depth limits are based on the information from the previous pings. The range gate setting is used to determine the size of this window. Selecting a large range gate may reduce the ping rate slightly when operating in shallow waters.
This is used to define to what degree a non-smooth bottom is to be accepted. The filter remove beams with depths that deviate too much from a smoothed bottom profile as derived from the detected beams. The stronger filtering, the less deviation is accepted.
If you select OFF, no filtering will take place. This parameter is used to specify the amount of range overlap between the detections. As a result, there will be no averaging of phase detections between beams. Note that this is provided that a minimum number of phase samples are available to do proper phase detection. As a result, there will be a slight averaging of phase detections between beams. This will result in an increasing averaging of phase detections between beams with increasing beam angle.
SHORT phase ramp gives the best resolution, but a side effect can be that the detected bottom will have increased noise. A normal TVG assumes a flat bottom, and will work well almost anywhere. However, with bottoms with two distinct depths such as around manmade trenches, better results may be obtained by enabling the special TVG. Normally set to OFF. Set the Length of transmit pulse, it is advised to leave this on Auto Normal Inci.
Sector Angle This value is used to define the angle in degrees at which the bottom backscatter can be assumed not to be affected by the strong increase at normal incidence. The optimum crossover angle will vary with the bottom type. For seabed imaging, it is important to adjust this angle so that a minimum of angle dependent amplitude variation is seen. This is to give best use of its dynamic range.
Multi Path Suppression.
Kongsberg Simrad EM3002 MBES
The Kongsberg EM 3002 Multibeam Echo Sounder