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T20-P DualHead installed successfully
10.04.2015 [Kategorie: Hydrographische Systeme]Von: Jörg BrunkenMultibeam - success story
After installation of the SeaBat T20-P
Port of Hamburg
Valeport UltraSV
After installation – SeaBat T20-P
Data acquisition
Slope areas
Shallow water areas
Sheet pile survey
In December 2014, MBT GmbH received an order from Hamburg Port Authority AöR (HPA) for the supply, installation and setting-to work of a Reson SeaBat T20-P Full-Rate-Dual-Head Multibeam system with the new Valeport UltraSV.
Speed of sound is monitored using the new Valeport UltraSV. The compact housing of the sensor is ideal for SeaBat systems. MBT developed a mounting bracket for the Ultra SV to be attached to the mounting of the T20-P.
Using four vessels, HPA conducts around 800 surveys per year in the port of Hamburg. The „Deepenschriewer II“ was recently refurbished with a T20-P Dual-Head system, replacing a SeaBat 7101 multibeam system as well as a Navitronic multi-channel system. For the multi-channel system, there are two extendible arms mounted to the „Deepenschriewer II“, leading to a width of around 40m. This system is used in very shallow waters.
HPA is hoping to replace both systems on the „Deepenshriewer II“ with the new T20-P DualHead and thus to reduce survey time.
The sensing heads were mounted with a tilt angle of 30° using a special and highly precise mounting developed by Reson. Each sensing head is linked to a T20-P processing unit, which is in turn linked to a data acquisition PC via Ethernet.
For data acquisition, HPA has been using QINSy survey software developed by QPS in the Netherlands. The newly developed SeaBat user software is installed on the same PC as the QINSy software and allows for full control of the DualHead. Besides setting hydroacoustic parameters, the operator can easily alter opening angles or depth filters.
In order to reach highest precision of the outer beams, a frequency of 400 kHz is used. The measurement rate can be up to 50 pings per second depending on depth, where 1024 beams per ping can be recorded. The configurable beamformer enables a set number of beams or a set distance between the beams respectively in order to avoid producing unnecessarily large amounts of data.
In automatic mode, the user can define a set width of the mapped seafloor. The system then adjusts the opening angle continuously, so that the set width may be maintained.
Equipped with X-Range technology (frequency modulation), the T20-P DualHead is able to send out transmit pulses per sensing head. This doubles the transmit rate compared to traditional Dual-Head systems. X-Range is based on a combination of frequency modulated transmission (FM-Chirp) and extended signal processing. Even for higher ranges, resolution remains high. A further advantage of FM is a reduced sensitivity to ambient noise, resulting in noticeably „clean“ data.
To guarantee highest reliability in bottom detection, the T20-P is additionally equipped with MultiDetect, a feature which is unique to the SeaBat systems. MultiDetect enables detection of up to five points within one beam. Objects can be detected with a higher point density. HPA especially focuses on areas directly in front of sheet pilings. MultiDetect helps to survey sheet pilings and areas in front of them with high precision, without the need to analyse large amounts of water column survey data.
The first data recorded during the acceptance test were quite impressive. Coverage was partly more than 15-times the water depth and with the help of MultiDetect, sheet pilings were displayed rather precisely.