Hydrosweep DS Mapping System

The Hydrosweep DS System is manufactured by:

Krupp Atlas Elektronik
Bremen, Germany

The name ATLAS HYDROSWEEP comes from "HYDROgraphic Multi-Beam SWEEPing Survey Echosounder".

The equipment is used for hydrographic survey of areas in shallow, medium depth and deep sea regions. Display and recording of morphological structures are in the form of area presentations in color video and as isoline presentations. For postprocessing, two magnetic tape recorders are provided for storing the positon and depth data. In addition, there is a serial interface for transferring on-line measured data in realtime to a postprocessing computer system.

The ATLAS HYDROSWEEP Equipment belongs to the family of multi-beam sweeping survey systems with a broad coverage of 90 degrees perpendicular to the ship's longitudinal axis. It is thus possible to measure 59 depth values with a single sounding. Coverage is a width of about double the vertical depth if the bottom is level.

One special feature of the ATLAS HYDROSWEEP Equipment is that, in order to determine the sound velocity, the 59 depth values can be measured parallel to the ship's longitudinal axis. This is called "calibration mode".

By means of this special calibration method, the mean velocity of sound is determined over the water column. Sound refraction effects in the slanting beams are compensated. In the calibration mode, the transmitting and receiving functions of the system are swapped between the two hydroacoustic transducer arrays.

STRUCTURE OF THE EQUIPMENT

The HYDROSWEEP Equipment mainly consists of the following:

• Two Hydroacoustic Transducer Arrays SW-6050-A-001. They consist of several individual modules, and are installed in a "T" configuration.
• The Transceiver Electronics, which is installed in three Electronics Cabinets SH-6020-A-001, SH-6020-A-003 and GE-6012.
• The Control/Display Console BD-6002, on which the measured values are displayed on a color screen, either as a cross profile view or as a contour layer display. The operating procedure and the input of parameters take place via a functional keyboard and an alphanumeric keyboard. The display of numerical data takes place on a display terminal.
• The Bottom Mapping Recorder PT-8: a printer/plotter which generates an isoline presentation of the morphology.
• Two Magnetic Tape Drives with computer, GE-6017 and GE-6018. They record the parameters, the measured depth values, and the position values supplied by connected equipments.
• The Display Unit AZ-6043 (an option), which serves as a slave display for the color display on the Control/Display Console.

The external signal-interfaces, provide the input/output interface between the HYDROSWEEP Equipment and the other equipments.

These data and signals are as follows:

• Position data from a navigation system.
• Course angle ("heading") from the gyro compass or from a sensor platform.
• Speed parallel to and perpendicular to the ship's longitudinal axis.
• Roll angle, pitch angle and heave information from a sensor platform.
• Sound velocity information from a measurement sensor (if connected) in order to acquire the velocity of sound at the transducer location.

Together with the measured depth values, these data are stored on a magnetic tape, or are processed computationally for on-line calculation of the isoline presentation on the plotter.

A typical configuration of the ATLAS HYDROSWEEP Equipment is shown in the following illustration.

Note: Hydrosweep Raw data files are found on the server "indian" in the directory /tgt-data/hysweep