Underwater Communications Sample Clauses

Underwater Communications. The vessel shall be able to support underwater telephone operations. Vessel shall accommodate underwater telephone compatible with EDO 5400 having transponder interrogator pinger echo sounder (TIPE)(GFE). The vessel shall be configured to receive an acoustic navigation transducer (GFE). The item requires a through-hull penetration and shall be a deployed by way of retractable tube of a minimum 12-inch diameter at least three to four feet below the bottom of the hull fitted with a hydraulic lifting winch, boom, or crane. Through-hull penetrations, retractable tubes, and lifting system are to be provided by the vessel. The retractable tube shall be of sufficient design to allow the ship to reposition and move for short periods <5knots with the pole extended and energized.
Sample 1
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Underwater Communications. Worldwide, increasing effort is put into research on underwater communication systems with many of the results originating from the field of wireless communications. However, the acoustic underwater communications channel is quite different from the electromagnetic wireless communications channel and as such radically different physical layer and networking techniques must be introduced so as to support the autonomous operation of multi-AUV systems. The acoustic channel. The underwater acoustic channel is quite possibly nature’s most unforgiving wireless communication medium [C1]. Absorption at high frequencies, and ship noise at low frequencies, limit the usable bandwidth to a few (tens) of kilohertz, depending on the range. Horizontal underwater channels are prone to multipath propagation due to refraction, reflection and scattering – this is especially true in clean-up operations where the physical properties of the communication medium can have significant spatial variations. The sound speed of 1.5 km/s is low compared to the speed of light and leads to channel-delay spreads of tens or hundreds of milliseconds. In certain environments, reverberation can be heard ringing for many seconds and ultimately limits the performance of communication systems. The low speed of sound is also responsible for significant Doppler effects, which can be subdivided in (time-varying) frequency shifts and instantaneous frequency spreading due to various mechanisms [C2]. Both phenomena contribute to the Doppler variance of the received communication signals, and require different measures to be taken at the receiver. A channel displaying both time-delay and frequency dispersion is known as a doubly spread channel. If the product of delay spread and Doppler spread exceeds unity, then the channel is known as being overspread, and there is little hope for reliable communication. Apart from covert applications, the performance of underwater communication systems is normally not limited by noise but by multipath and Doppler. This implies that it is not possible to increase the feasible data rate to an arbitrary value by increasing the SNR. Acoustic modems used in underwater networks often operate at a data rate of no more than a few hundred bits per second. High(er) data rates are feasible, depending on the environment and conditions, but for robust operation an array of receivers is required. Physical layer considerations. Until the mid-nineties, research in underwater communi...
Sample 1

Related to Underwater Communications

  • Privilege for Communications The official communications of the Bank shall be accorded by each member the same treatment that it accords to the official communications of other members.

  • Union Communications (a) The Employer will provide a bulletin board for the exclusive use of the Union. The sites will be determined by mutual agreement. The use of the bulletin boards is restricted to the affairs of the Union.

  • Routine Communications All routine communications related to the Contract shall be sent to the Department’s Contract Manager. If any of the Contractor’s contract information changes during the life of the Contract, the Contractor shall notify the Department’s Contract Manager; such updates do not necessitate a formal amendment to the Contract. Communications relating to a Customer contract or purchase order should be addressed to the contact person identified in the contract or purchase order. Routine communications may be my email, regular mail, or telephone.

  • Public Communications Prior to the Closing Date, the Company will not issue any press release or other communication directly or indirectly or hold any press conference with respect to the Company, its condition, financial or otherwise, or the earnings, business, operations or prospects of any of them, or the offering of the Securities, without the prior written consent of the Placement Agent, unless in the reasonable judgment of the Company and its counsel, and after notification to the Placement Agent, such press release or communication is required by law, in which case the Company shall use its reasonable best efforts to allow the Placement Agent reasonable time to comment on such release or other communication in advance of such issuance.

  • PUBLIC COMMUNICATION Neither the Contractor nor any of its Staff shall make any statement to the press or issue through any media of communication any statement bearing on the Services performed or data collected under this Agreement, without the prior written approval of OSC.

  • TELEPHONE COMMUNICATIONS Both parties may communicate by telephone, but it is agreed that no instructions that require action will be left on any messaging service since neither party can guarantee that they will be received or actioned. Telephone conversations may be recorded by Us for training or monitoring purposes.

  • Communications in Writing Any communication to be made under or in connection with the Finance Documents shall be made in writing and, unless otherwise stated, may be made by fax or letter.

  • Services Communications Our Services include, in some cases, the ability to communicate to you, such as via email, text message, and push notifications. You hereby consent to our use of a l means of communication available to us to contact you. These communications may include messages from us, as we l as communications from Third Party Services and other of our third party partners. You may opt out of receiving communications by emailing us at our Contact Formavailable here or by clicking the “unsubscribe” link to the extent available in a communication you receive from us. We do not control and sha l have no responsibility for communications from third parties.

  • General Communications The type of communications described and defined in Article 5.6 herein.

  • Union Communication In the event of a violation of the no-strike provision, the Union will: • Publicly disavow such action by the Bargaining Unit Employees; • Notify the Bargaining Unit Employees of its disapproval of such action and instruct such Bargaining Unit Employees to cease such action and return to work immediately; and • Post notices on Union bulletin boards advising that it disapproves of such action and instructing Bargaining Unit Employees to return to work immediately.

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