The CH-148 Cyclone Heads out to Sea

Total Page:16

File Type:pdf, Size:1020Kb

The CH-148 Cyclone Heads out to Sea The CH-148 Cyclone Heads Out To Sea The History of the Canadian Maritime Helicopter Project By Kenneth I. Swartz t was a turbulent 11-year journey The first CH-148 Cyclone helicopter fully manned by Royal Canadian Air Force personnel from contract signing to first delivery, successfully landed on a Canadian warship at sea on Jan. 27, 2016. (DND photo) but the Sikorsky CH-148 Cyclone I deck landings and handling a routine “The Capability Release 1.1 CH-148 maritime helicopter finally entered Royal Canadian Air Force (RCAF) service in operation, even in very rough seas. Cyclone helicopter is a formidable June 2015. The CH-124 Sea King has served maritime platform with the capability The new fly-by-wire Cyclone is Canada with distinction since 1963, to perform anti-submarine warfare, derived from Sikorsky’s commercial but attempts to renew the country’s anti-surface warfare, utility transport S-92, but is a major technological maritime helicopter fleet have faced and search and rescue missions with advancement as Canada’s first many political and procurement the added benefits of additional speed, true intelligence, surveillance and setbacks. cabin space, range and endurance reconnaissance (ISR) helicopter. The Then on Nov. 20, 2004, Canada placed over the CH-124 Sea King; in its final CH-148 is equipped with a fully- a C$5B ($3.9B) order with Sikorsky for configuration, the Cyclone will bring integrated mission system, 21st-century 28 CH-148 Cyclones to introduce one of modern anti-submarine and anti-surface sensors and a multi-mission cabin that the world’s most advanced multi-role warfare capabilities to a level that can will provide a quantum leap in capability maritime helicopters to replace the only be defined as world class.” when deployed on warships of the Royal 50-year-old Sea Kings. Eight CH-148 Cyclones are now Canadian Navy (RCN) or flying other The Cyclone program got off to a in service at 12 Wing Shearwater, missions. promising start, but suffered a series Nova Scotia, and the entire fleet of of well-publicized delays “which seems 28 Cyclones is scheduled to be fully to be the norm for most sophisticated operational by 2021 following a series of The Sea King Successor maritime helicopter programs, as well as block upgrades. ixty years ago, Canada made the many of Canada’s recent large military bold decision to operate large day/ procurement initiatives,” said Canadian Canadian Naval Aviation night all-weather anti-submarine defense analyst Martin Shadwick with S anadian naval aviators served warfare (ASW) helicopters from the York University in Toronto. decks of small destroyers to counter “Canada has over 50 years of with distinction in the First and a growing Soviet submarine threat maritime helicopter experience CSecond World Wars, but it wasn’t beneath the North Atlantic. operating the CH-124 Sea King until 1946 that the Royal Canadian Skeptics said they couldn’t operate a helicopter platform, and now is on the Navy (RCN) formed its own aviation arm large Sikorsky Sea King-sized helicopter cusp of deploying a new weapon system at Shearwater, near Halifax to equip from the heaving deck of a destroyer built to its specific requirements and Canada’s first postwar aircraft carrier. in the stormy ocean, but the RCN performance parameters,” explained The RCN acquired three Bell HTL persevered and perfected a helicopter William Falk, Sikorsky Program Director, (47D) helicopters in 1951, three Sikorsky “haul down” system that made small Canadian Maritime Helicopter Program. HO4S-2s (S-55) in 1952, and three 18 VERTIFLITETIFLITE May/JuneMay/June 20162016 Canadian assembly of the Sikorsky CHSS-2 at its plant in Longueuil, Québec. The RCN took delivery of 41 CHSS-2s between 1962 and 1969, 37 of which were assembled in Canada. The Sea Kings equipped the aircraft carrier HMCS Bonaventure and the new helicopter/ destroyer fleet, and featured Canadian- made mission systems, strengthened landing gear and an automatic tail pylon folding system. “Beartrap” Haul Down The Royal Canadian Navy ordered the Sea King in the 1960s under the bold premise that it could System operate the large helicopters from the decks of small destroyers. Today, the aircraft conducts onsidered Canada’s greatest gift to frequent surface patrol missions. (Canadian Forces Combat Camera photo, January 2016) naval aviation, Canadian-designed Laurent-class destroyers to Cand built helicopter haul-down, extend the range of the ship’s securing and traversing systems are now anti-submarine sensors and widely used by navies around the world. provide an independent search The Canadian “Beartrap” system — the and attack capability. Helicopter Hauldown Rapid Securing RCN helicopters were already Device (HHRSD) — was first developed flying from the icebreaker HMCS between 1962 and 1965 by the RCN’s Labrador in the Arctic, but No. 10 Experimental Squadron (VX-10) could a larger ASW helicopter in collaboration with Fairey Aviation of safely operate from the heaving Canada, Sikorsky, P&WC and Dowty of deck of a 2,500-ton destroyer Canada. in the stormy and rough North The system entered RCN service in Atlantic? April 1967 and was cleared for day and The RCN was entering night operations to 30 degrees of roll uncharted waters, so sea trials and nine degrees of pitch up to Sea were conducted with a RCN State 6 — a wave height of 13 to 20 ft (4 HO4S-3 onboard the HMCS to 6 m). Buckingham fitted with a The haul-down system uses a winch temporary helideck in 1956, and cable to reel in the hovering helicopter, a heavier RCAF Sikorsky H-34 much like a fisherman reeling in a trout. (S-58) on the HMCS Ottawa in Landings are made during a lull in the 1957. ship’s motion; the two steel jaws with The trials confirmed that a spring-loaded teeth of the “beartrap” large helicopter could operate snap around a probe extending to the from a destroyer in rough seas, underside of the helicopter to firmly but the helicopter needed secure the aircraft to the ship’s deck. The Helicopter Hauldown Rapid Securing Device to be a robust design, the (HHRSD) uses a “beartrap” (under the fuselage) to winch The helicopter-destroyer marriage in the aircraft and grab the main probe; the tail probe warship needed an enclosed added a long-range “hunter-killer” guides the aircraft along the track. (Dept. of National maintenance hangar, and a capability to the Navy’s destroyer fleet Defence photo, September 2012) system had to be developed that proved more cost effective than an to safely guide a hovering aircraft carrier, and ultimately facilitated Piasecki HUP-3s in 1954 for training, helicopter to the deck and the HMCS Bonaventure’s retirement in icebreaker and SAR duties. Then it rapidly secure it to a rolling and pitching 1970. acquired 10 Sikorsky HO4S-3 anti- deck. submarine warfare (ASW) helicopters RCN committed to modifying seven Canadian Armed Forces with dipping sonars to equip Helicopter St. Laurent-class and the last two CH-124 Strike (HS) 50 Squadron, which first Annapolis-class destroyers for helicopter embarked aboard the aircraft carrier operations before it selected a new he CHSS-2 was re-designated Her Majesty’s Canadian Ship (HMCS) turbine-powered day/night all-weather the CH-124 in 1968 following Magnificent in July 1955. ASW helicopter. Tunification of the Canadian Armed Almost from the beginning, the The single-engine Kaman HU2K Forces and became the CH-124A in the Canadian Naval Warfare Study Group Seasprite was initially favoured by the 1970s when the Sea King Improvement had the revolutionary idea of deploying RCN, but United Aircraft of Canada (Pratt Program (SKIP) added a Litton APS-503 larger ASW helicopters with their own & Whitney Canada) won the helicopter surveillance radar, modern avionics and sonar and weapons onboard new St. contract with a bid that included sonobuoy chutes. 19Vol. 62, No. 3 VERTIFLITE May/June 201619 The Royal Canadian Air Force bought 15 CH-149 Cormorant helicopters The first prototype CH-148 demonstrated the automatic main rotor and — four seen here at Sydney Airport, Nova Scotia — for search and rescue tail folding capabilities. The folding composite tail pylons are built by missions. (Canadian Forces photo, March 2009) Kaman’s PlasticFab. (Sikorsky photo, December 2009) Between 1963 and 1974, Sea Kings New Shipborne Aircraft (NSA) in the later, in 2011, Canada spent C$164M flew with HS 50 until it was split into mid-1980s and then by the Maritime to buy nine grounded AgustaWestland HS 423 and HS 443. These squadrons, Helicopter Project (MHP) in the early VH-71 Kestrels from the cancelled VXX along with 406 Maritime Operational 2000s. US Presidential Helicopter program for Training Squadron, were all based at In 1992, the Conservative spare parts and potential conversion to Shearwater until HS 443 Squadron government of Prime Minister new CH-149 Cormorants). moved to Patricia Bay (Victoria Brian Mulroney signed a contract The Sea King replacement was stalled International Airport), British Columbia, worth C$5.8B ($4.9B USD) to buy 50 for 10 years until Prime Minister Paul in July 1989 to support Canadian EH101 helicopters from the Anglo- Martin replaced Chrétien in December warships based on the west coast. Italian consortium EH Industries Ltd, 2003 and immediately issued a tender Until the end of the Cold War, the comprising 35 CH-148 Petrels for naval for a new maritime helicopter. Sea King was primarily used to extend use and 15 CH-149 Chimos for search the anti-submarine capabilities of the and rescue, with all the aircraft to be Maritime destroyers and frigates on which it assembled at the Bell Helicopter Textron Helicopter Project was embarked.
Recommended publications
  • Interface Design for Sonobuoy Systems
    Interface Design for Sonobuoy Systems by Huei-Yen Winnie Chen A thesis presented to the University of Waterloo in fulfillment of the thesis requirement for the degree of Master of Applied Science in Systems Design Engineering Waterloo, Ontario, Canada, 2007 ©Huei-Yen Winnie Chen 2007 AUTHOR'S DECLARATION I hereby declare that I am the sole author of this thesis. This is a true copy of the thesis, including any required final revisions, as accepted by my examiners. I understand that my thesis may be made electronically available to the public. ii Abstract Modern sonar systems have greatly improved their sensor technology and processing techniques, but little effort has been put into display design for sonar data. The enormous amount of acoustic data presented by the traditional frequency versus time display can be overwhelming for a sonar operator to monitor and analyze. The recent emphasis placed on networked underwater warfare also requires the operator to create and maintain awareness of the overall tactical picture in order to improve overall effectiveness in communication and sharing of critical data. In addition to regular sonar tasks, sonobuoy system operators must manage the deployment of sonobuoys and ensure proper functioning of deployed sonobuoys. This thesis examines an application of the Ecological Interface Design framework in the interface design of a sonobuoy system on board a maritime patrol aircraft. Background research for this thesis includes a literature review, interviews with subject matter experts, and an analysis of the decision making process of sonar operators from an information processing perspective. A work domain analysis was carried out, which yielded a dual domain model: the domain of sonobuoy management and the domain of tactical situation awareness address the two different aspects of the operator's work.
    [Show full text]
  • Appendix A: Navy Activities Descriptions
    Appendix A: Navy Activities Descriptions NORTHWEST TRAINING AND TESTING FINAL EIS/OEIS OCTOBER 2015 TABLE OF CONTENTS APPENDIX A NAVY ACTIVITIES DESCRIPTIONS .............................................................................. A-1 A.1 TRAINING ACTIVITIES ................................................................................................................. A-1 A.1.1 ANTI-AIR WARFARE TRAINING ............................................................................................................ A-1 A.1.1.1 Air Combat Maneuver ............................................................................................................... A-2 A.1.1.2 Missile Exercise (Air-to-Air) ....................................................................................................... A-3 A.1.1.3 Gunnery Exercise (Surface-to-Air) ............................................................................................. A-4 A.1.1.4 Missile Exercise (Surface-to-Air) ................................................................................................ A-5 A.1.2 ANTI-SURFACE WARFARE TRAINING ..................................................................................................... A-6 A.1.2.1 Gunnery Exercise Surface-to-Surface (Ship) .............................................................................. A-7 A.1.2.2 Missile Exercise Air-to-Surface .................................................................................................. A-8 A.1.2.3 High-speed Anti-Radiation Missile
    [Show full text]
  • Displaying Bioacoustic Directional Information from Sonobuoys Using “Azigrams”
    Displaying bioacoustic directional information from sonobuoys using “azigrams” Aaron M. Thode,1,a) Taiki Sakai,2,b) Jeffrey Michalec,3 Shannon Rankin,3 Melissa S. Soldevilla,4 Bruce Martin,5 and Katherine H. Kim6 1Marine Physical Laboratory, Scripps Institution of Oceanography, University of California San Diego, La Jolla, California 92093-0238, USA 2Lynker Technologies, LLC, under contract to the Southwest Fisheries Science Center, NMFS/NOAA, La Jolla, California 92037, USA 3Southwest Fisheries Science Center, NMFS/NOAA, La Jolla, California 92037, USA 4Southeast Fisheries Science Center, NMFS/NOAA, 75 Virginia Beach Drive, Miami, Florida 33149, USA 5JASCO Applied Sciences, 32 Troop Avenue, Suite 202, Dartmouth, Nova Scotia, B3B 1Z1, Canada 6Greeneridge Sciences, Inc., 90 Arnold Place, Suite D, Santa Barbara, California 93117, USA (Received 16 November 2018; revised 22 May 2019; accepted 5 June 2019; published online 10 July 2019) The AN/SSQ-53 Directional Frequency Analysis and Recording (DIFAR) sonobuoy is an expend- able device that can derive acoustic particle velocity along two orthogonal horizontal axes, along with acoustic pressure. This information enables computation of azimuths of low-frequency acous- tic sources from a single compact sensor. The standard approach for estimating azimuth from these sensors is by conventional beamforming (i.e., adding weighted time series), but the resulting “cardioid” beampattern is imprecise, computationally expensive, and vulnerable to directional noise contamination for weak signals. Demonstrated here is an alternative multiplicative processing scheme that computes the “active intensity” of an acoustic signal to obtain the dominant direction- ality of a noise field as a function of time and frequency. This information is conveniently displayed as an “azigram,” which is analogous to a spectrogram, but uses color to indicate azimuth instead of intensity.
    [Show full text]
  • SOCAL 2011-2012 Aerial Surveys
    Performed and submitted for the U.S. Navy's Southern California Range Complex 2012 Annual Monitoring Report AERIAL SURVEYS CONDUCTED IN THE SOCAL OPAREA FROM 01 AUGUST 2011 TO 31 JULY 2012 Photo by B. Würsig, taken under NMFS permit 14451 Prepared for Commander, U.S. Pacific Fleet, Pearl Harbor, Hawaii Submitted to Naval Facilities Engineering Command Southwest (NAVFAC SW), EV5 Environmental, San Diego, CA, 92132 Contract # N62470-10-D-3011 Prepared by HDR Inc. San Diego, California 1 August 2012 Performed and submitted for the U.S. Navy's Southern California Range Complex 2012 Annual Monitoring Report Citation for this report is as follows: Smultea, M.A., C. Bacon, T.F. Norris, and D. Steckler. 2012. Aerial surveys conducted in the SOCAL OPAREA from 01 August 2011 to 31 July 2012. Prepared for Commander, U.S. Pacific Fleet, Pearl Harbor, HI. Submitted to Naval Facilities Engineering Command Southwest (NAVFAC SW), EV5 Environmental, San Diego, 92132 under Contract No. N62470-10-D-3011 issued to HDR, Inc., San Diego, CA. Submitted August 2012. Cover Photo: Gray whales (Eschrichtius robustus), photographed with a telephoto lens from the Partenavia fixed-wing aircraft during a winter 2012 SOCAL aerial monitoring survey. Photo by B. Würsig under NMFS permit 14451. Performed and submitted for the U.S. Navy's Southern California Range Complex 2012 Annual Monitoring Report Aerial Surveys Conducted from 01 August 2011 to 31 July 2012 Final Technical Report Table of Contents ACRONYMS AND ABBREVIATIONS ....................................................................................
    [Show full text]
  • Bistatic Sonobuoy Deployment Strategies for Detecting Stationary and Mobile Underwater Targets
    Bistatic Sonobuoy Deployment Strategies for Detecting Stationary and Mobile Underwater Targets Mumtaz Karatas Emily Craparo (1) Industrial Engineering Department Department of Operations Research Naval Academy, National Defense University Naval Postgraduate School Istanbul, 34940, TURKEY Monterey, CA 93943, USA [email protected] [email protected] (2) Bahcesehir University Istanbul, 34353, TURKEY Gülşen Akman Industrial Engineering Department Kocaeli University Kocaeli, 41380, TURKEY [email protected] ABSTRACT The problem of determining effective allocation schemes of underwater sensors for surveillance, search, detection, and tracking purposes is a fundamental research area in military OR. Among the various sensor types, multistatic sonobuoy systems are a promising development in submerged target detection systems. These systems consist of sources (active sensors) and receivers (passive sensors), which need not be collocated. A multistatic sonobuoy system consisting of a single source and receiver is called a bistatic system. The sensing zone of this fundamental system is defined by Cassini ovals. The unique properties and unusual geometrical profile of these ovals distinguish the bistatic sensor allocation problem from conventional sonar placement problems. This study is aimed at supporting decision makers in making the best use of bistatic sonobuoys to detect stationary and mobile targets transiting through an area of interest. We use integral geometry and geometric probability concepts to derive analytic expressions for the optimal source and receiver separation distances to maximize the detection probability of a submerged target. We corroborate our analytic results using Monte Carlo simulation. Our approach constitutes a valuable “back of the envelope” method for the important and difficult problem of analyzing bistatic sonar performance.
    [Show full text]
  • 2 Description of Proposed Action and Alternatives
    2 Description of Proposed Action and Alternatives NORTHWEST TRAINING AND TESTING FINAL EIS/OEIS OCTOBER 2015 TABLE OF CONTENTS 2 DESCRIPTION OF PROPOSED ACTION AND ALTERNATIVES ..........................................................2-1 2.1 DESCRIPTION OF THE NORTHWEST TRAINING AND TESTING STUDY AREA ..................................................2-2 2.1.1 DESCRIPTION OF THE OFFSHORE AREA ................................................................................................... 2-5 2.1.1.1 Air Space ..................................................................................................................................... 2-5 2.1.1.2 Sea and Undersea Space ............................................................................................................. 2-5 2.1.2 DESCRIPTION OF THE INLAND WATERS ................................................................................................... 2-7 2.1.2.1 Air Space ..................................................................................................................................... 2-7 2.1.2.2 Sea and Undersea Space ............................................................................................................. 2-7 2.1.3 DESCRIPTION OF THE WESTERN BEHM CANAL, ALASKA............................................................................. 2-9 2.2 PRIMARY MISSION AREAS .......................................................................................................... 2-12 2.2.1 ANTI-AIR WARFARE .........................................................................................................................
    [Show full text]
  • Acoustic Signal Processing for Ocean Exploration Kindle
    ACOUSTIC SIGNAL PROCESSING FOR OCEAN EXPLORATION PDF, EPUB, EBOOK J.M.F Moura | 676 pages | 14 Oct 2012 | Springer | 9789401046992 | English | Dordrecht, Netherlands Acoustic Signal Processing for Ocean Exploration PDF Book Several choices of starting fields are provided, including a Gaussian source beam of varying width and tilt with respect to the horizontal. Underwater acoustic communication is also finding increasing adoption as pre-warning system for underwater earthquakes or tsunamis and to monitor underwater pollution and habitat. Log in here. Keller and J. McLaren, M. View at: Google Scholar F. Read this book on SpringerLink. Download image jpg, 98 KB. Coherent ray clusters were observed in which large fans of rays with close initial conditions preserved close current dynamical characteristics over long distances. Prior and A. Sign up here as a reviewer to help fast-track new submissions. Paul C. Karasalo, and J. The tabu search begins by marching to a local minimum. Measuring currents is a fundamental practice of physical oceanographers. A year baseline inventory of modeling techniques was updated with the latest developments, including basic mathematics and references to the key literature, to guide soundscape practitioners to the most efficient modeling techniques for any given application. The bottom structure is modeled as a fluid sediment layer over a solid half-space. He has conducted more than 60 scientific expeditions in the Arctic, Atlantic, Pacific, and Indian Oceans. Ocean acidification, which occurs when CO 2 in the atmosphere reacts with water to create carbonic acid H 2 CO 3 , has increased. Most traditional active sonars are configured in what is termed a monostatic geometry, meaning that the source and receiver are at the same position.
    [Show full text]
  • Canada Gouvernementaux Canada 1
    Public Works and Government Services Travaux publics et Services 1 Canada gouvernementaux Canada 1 RETURN BIDS TO: Title - Sujet RETOURNER LES SOUMISSIONS À: MULTISTATIC ACTIVE SONAR EMPLOYMENT Bid Receiving Public Works and Government Solicitation No. - N° de l'invitation Date Services Canada/Réception des soumissions W7707-135646/A 2012-11-27 Travaux publics et Services gouvernementaux Client Reference No. - N° de référence du client GETS Ref. No. - N° de réf. de SEAG Canada W7707-13-5646 PW-$HAL-210-8840 1713 Bedford Row Halifax, N.S./Halifax, (N.É.) File No. - N° de dossier CCC No./N° CCC - FMS No./N° VME B3J 1T3 HAL-2-69288 (210) Bid Fax: (902) 496-5016 Solicitation Closes - L'invitation prend finTime Zone at - à 02:00 PM Fuseau horaire Atlantic Standard Time on - le 2012-12-13 AST LETTER OF INTEREST F.O.B. - F.A.B. LETTRE D'INTÉRÊT Plant-Usine: Destination: 9 Other-Autre: Address Enquiries to: - Adresser toutes questions à: Buyer Id - Id de l'acheteur Thorpe, Susan hal210 Telephone No. - N° de téléphone FAX No. - N° de FAX (902) 496-5191 ( ) (902) 496-5016 Destination - of Goods, Services, and Construction: Destination - des biens, services et construction: DEPARTMENT OF NATIONAL DEFENCE DRDC ATLANTIC 9 GROVE STREET DARTMOUTH NOVA SCOTIA B3A 3C5 Canada Comments - Commentaires Instructions: See Herein Instructions: Voir aux présentes Vendor/Firm Name and Address Raison sociale et adresse du fournisseur/de l'entrepreneur Delivery Required - Livraison exigée Delivery Offered - Livraison proposée SEE HEREIN Vendor/Firm Name and Address Raison sociale et adresse du fournisseur/de l'entrepreneur Telephone No.
    [Show full text]
  • SAESSOLUTIONS DEFENCE & SECURITY Electronica-Submarina.Com SPECIALISTS in UNDERWATER ACOUSTICS and ELECTRONICS
    SAESSOLUTIONS DEFENCE & SECURITY electronica-submarina.com SPECIALISTS IN UNDERWATER ACOUSTICS AND ELECTRONICS ANTI-SUBMARINE WARFARE MARINE SECURITY & ENVIRONMENTAL PROTECTION Sonobuoy Processing SPAS System SYSTEMS FOR SUBMARINES AND SURFACE SHIPS SONARS ACOUSTIC CLASSIFICATION OWN NOISE MONITORING SYSTEM SONAR PERFORMANCE PREDICTION SYSTEM RDTAS Towed Array Sonar Diver Detection Sonar UNDERWATER SIGNATURE MEASUREMENT ENGINEERING & TRAINING SERVICES Multi-Influence Range MIRS System NAVAL MINES TRAINING & SIMULATION Tactical Simulators MINEA – MULTI-INFLUENCE NAVAL MINES MILA – LIMPET NAVAL MINE SAES High Technical Qualification Own Technical Capability Specialists in Underwater Electronics SAESSOLUTIONS DEFENCE & SECURITY 2 WELCOME SAES is a Spanish company specialized in submarine electronic equipment and systems for undersea security and defence that provides advanced solutions technologically adapted to the need of clients and offers security services in the civil and military fields. SAES offices and electronic workshop are located in Cartagena and Cádiz, where the Spanish Navy has its main facilities and schools related to Submarine, Mines Warfare and Antisubmarine Warfare. Our engineers are highly skilled and experienced in electronics, acoustics, design, software and hardware development, methodologies, quality and operational requirements on underwater based needs. SAES, founded in 1989, is classified as a strategic national company being NAVANTIA, INDRA and THALES their shareholders. SOLUTIONS Innovation SAES Cost- Quality Effective Customer Confidence oriented 3 electronica-submarina.com CONTENTS From our engineering and manufacturing facilities, we have successfully developed and integrated solutions tailored to the governments needs. Cost effectiveness, reliability, modularity and open architecture defines our systems, which are in-service around the world. SONAR & ONBOARD SYSTEMS PAG. 5 UNDERWATER SIGNATURES ANTI-SUBMARINE WARFARE MEASUREMENT PAG. 10 PAG.
    [Show full text]
  • Drifting Hydrophones As an Ecologically Meaningful Approach to Underwater Soundscape Measurement in Coastal Benthic Habitats
    JOURNAL OF ECOACOUSTICS www.veruscript.com/jea Drifting hydrophones as an ecologically meaningful approach to underwater soundscape measurement in coastal benthic habitats 1,* 1 1 1 Original paper Ashlee Lillis , Francesco Caruso , T. Aran Mooney , Joel Llopiz , DelWayne Bohnenstiehl2, David B. Eggleston2,3 Article history: 1 Woods Hole Oceanographic Institution, 266 Woods Hole Road, Woods Received: 10 October 2017 Hole, MA, USA 02543 Accepted: 3 January 2018 2 Department of Marine, Earth & Atmospheric Sciences, North Carolina Published: 6 February 2018 State University, Raleigh, NC, USA 27695-8208 3 Center for Marine Sciences & Technology, North Carolina State University, Morehead City, NC, USA 28557 *Correspondence: AL: [email protected] Peer review: Abstract Double blind The ambient acoustic environment, or soundscape, is of broad Copyright: interest in the study of marine ecosystems as both a source of © 2018 Lillis et al. c This is an open access rich sensory information to marine organisms and, more broadly, article distributed under the Creative as a driver of the structure and function of marine communities. Commons Attribution Non Commercial Increasing our understanding of how soundscapes affect and License (CC‑BY NC 4.0), which permits reflect ecological processes first requires appropriate charac- unrestricted use, distribution, and terization of the acoustic stimuli, and their patterns in space and reproduction in any medium for time. Here, we present a novel method developed for measuring noncommercial purposes only, provided soundscape variation, using drifting acoustic recorders to the original work is properly cited and its quantify acoustic dynamics related to benthic habitat composi- authors credited. tion. Selected examples of drifter results from sub-tidal oyster- reef habitats in Pamlico Sound, North Carolina, USA, and from Keywords: coral reef habitats in St.
    [Show full text]
  • Modelling Multistatic Sonar Performance
    Prodeedings of the 37th Scandinavian Symposium on Physical Acoustics 2 - 5 February 2014 Modelling multistatic sonar performance Vidar Anmarkruda, Karl Thomas Hjelmervika aNorwegian Defence Research Establishment (FFI), P. O. Box 115, NO-3191 Horten Abstract: By including bistatic reception in a sonobuoy operation the ability to detect and track an underwater target is improved. Both when applying FM and CW sonar pulses, the added source/receiver geometry is beneficial for some target locations. The localization ability of the bistatic reception is highly dependent on the input errors as well as the source/target/receiver geometry. Sometimes bistatic detections should be disregarded because of high localization uncertainty, and should therefore be accompanied by an estimate of the localization error. Keywords: Multistatic sonar, localization, detection, modelling sonar data are shared with the cooperating platforms by fusing sonar data. INTRODUCTION Bistatic sonar operation: Platforms process receptions from their own and other sources, Active sonar operations have been performed resulting in a maximum number of (SR + S) since before the Second World War. Traditionally * (N – S) source-receiver pairs. The sonar these operations are performed by use of one or data before tracking are not shared with the several sources with co-located receivers, so- cooperating sensor, but processed tracks are called monostatic operations. However, in the communicated. past decades there has been an increasing focus Multistatic sonar operation: As bistatic on bi- and multistatic sonar operations sonar operation, but the processed sonar data [1][6][7][8]. are shared with the co-operating sensor by Let SR be the number of platforms equipped fusing sonar data.
    [Show full text]
  • Technical Note
    Indian Journal of Geo Marine Sciences Vol. 47 (09), September 2018, pp. 1723-1726 Technical Note SONO BOUYS Raja Acharya India Meteorological Department,Regional Meteorological Centre,Kolkata,Ministry of Earth Sciences 4, Duel Avenue,Alipore Kolkata-700027 [E.Mail: [email protected] ] Received: 14 May 2018 Revised 20 July 2018 A bouy is an anchored floating device which serves as (http://navyaviation.tpub.com/14030/css/Sonobuoy a navigation mark, to show reefs or other hazards, or -Receivers-107.htm) for mooring. A Sono Bouy is a buoy equipped to Sono buoys are classified into three categories: detect underwater sounds, objects and transmit them active, passive and special purpose. by radio. It is a relatively small buoy (typically 13 cm Active sono buoy uses a transducer to radiate a or 5 in, in diameter and 91 cm or 3 ft long with sonar pulse that is reflected back from the target. The expendable sonar system that is dropped/ejected from time interval between the ping (sound pulse) and the aircraft or ships conducting anti-submarine warfare or echo return to the sono buoy is measured. Taking the underwater acoustic research. Doppler Effect on the pulse frequency into The sono buoy has 4 main components: a float, a consideration, this time-measurement data is used to radio transmitter, a saltwater battery, and a calculate both range and speed of the submarine hydrophone. Hydrophone is an underwater sensor relative to the sono buoy. The command activated that converts the pressure waves from underwater buoy is controlled by a UHF command signal from sounds into electrical voltages that get amplified and the aircraft.
    [Show full text]