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SONAR an acronym for Sound Navigation and Ranging is a method of detecting and/or locating underwater objects.  There are two general classification of sonar, passive and active.  A passive sonar system only receives sound waves from external sources; it does not send any sound waves out.  This is an advantage in military applications, where silence is vital to avoid detection by the enemy.  Unlike passive sonar systems, active sonar systems transmit and receive. When transmitting, an acoustical signal is sent into the water; the signal will bounce off of any object in the path of the signal and return by the way of an "echo".  The signal strength or time of the received "echo" can then be measured and the range and orientation of the object can be determined.  Sonar is the most widely used application for mapping of the seafloor with two types of sonar most often used; these are Multi beam Sonar and Side scans Sonar. 


Conventional side scan sonar systems use a single sonar beam per side to generate an image of the sea floor. The physics of this type of sonar results in degradation of image resolution with range and requires speeds of 5 knots or less to insure 100 % bottom coverage.


From a design perspective, both of these shortcomings can be eliminated by designing sonar that, through beam steering and focusing techniques, simultaneously generates several adjacent, parallel beams per side. Such a multi-beam design approach permits higher towing speeds with 100 % bottom coverage, while providing high resolution imaging to the maximum range of the sonar.


This design approach, principally employed by military Side Scan Sonar systems designed for high speed mine hunting applications, has been prohibitively expensive for commercial operations. LMS Technologies is proud to be associated with an American company who is first commercial company to offer a multi-beam side scans sonar using similar design techniques to military Sonar’s but at a fraction of a cost.


SIDE SCAN SONAR systems consists of a


1)       Tow fish –The stainless steel tow fish incorporates two multi channel acoustic arrays and a pressure bottle which houses all the electronics and sensors necessary for sonar data acquisition, attitude sensing, system control and telemetry.


2)       Two cables- The sonar and sensor data is transmitted up the tow cable via a high speed digital telemetry link, requiring only a single coaxial or fiber optic cable.


3)       Tran receiver/processor unit (TPU)-The surface mounted TPU receives this data, performs all necessary digital processing functions on the acoustic data, and relays control command to tow fish. Processed data is then distributed to one or multiple PC display and control unit (DCU) via a 100 base T Ethernet, LAN network where the tasks of data viewing, storage, and analysis can be accomplished.


LMS is associated with a known and experienced supplier of SSS who are involved in design, development, and installation and provide maintaince services for the SSS intended for mapping of seafloor .We have a range of operational systems installed worldwide. LMS is proud to be involved in installation, commissioning and maintaince of first of its kind of SSS in India and the proud customer is INDIAN NAVY, MUMBAI. LMS is also responsible for the warranty and AMC of Indian Navy’s SSS.


Taking care of the present requirements and problems facing by the operators while mapping the sea bed we have providing latest technology SSS for the military and commercial use.

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               Last modified: 07/26/05