Retour aux nouvelles

5 février 2021 | International, Aérospatial, Naval, C4ISR

New Sonar Sees Underwater From The Air, Promising To Transform Anti-Submarine Warfare

Researchers at Stanford University have developed a new type of sonar to overcome the previously insurmountable problem of seeing underwater from the air. Sound does not travel easily between air and water: there is a 65-decibel loss, which means roughly a million-fold decrease in intensity, making it makes it virtually impossible to pick up sound reflections from the air. The new technology can map the seabed and potentially detect mines, submarines and other underwater targets from aircraft.

Currently, the only ways of using sonar from aircraft are sonar buoys (sonobuoys) dropped into the water, or dipping sonar lowered to the sea surface from a hovering helicopter. The helicopter cannot move while using dipping sonar, so it has to check one spot, raising the sonar, fly somewhere else, lowering the sonar again, and so on.

By contrast, the new Photoacoustic Airborne Sonar System or PASS, developed at Stanford with funding from the U.S. Navy, will work from a moving aircraft.

“Our vision of the proposed technology is to capture images continuously as the airborne vehicle flies over the water,” Stanford researcher Aidan Fitzpatrick told Forbes. “Similar to how synthetic aperture radar systems or in-water synthetic aperture sonar systems work today.”

https://www.forbes.com/sites/davidhambling/2021/02/04/new-sonar-sees-underwater-from-aircraft/

Sur le même sujet

  • Sikorsky S-97 Raider Exceeds 200 Knots as Company Prepares Proposal for U.S. Army's Future Attack Reconnaissance Aircraft

    4 octobre 2018 | International, Aérospatial

    Sikorsky S-97 Raider Exceeds 200 Knots as Company Prepares Proposal for U.S. Army's Future Attack Reconnaissance Aircraft

    Sikorsky's self-funded X2 Technology is backbone of company's next generation helicopters WEST PALM BEACH, Fla., Oct. 4, 2018 /PRNewswire/ -- The Sikorsky S-97 Raider light tactical prototype helicopter is advancing rapidly through its flight test schedule, recently exceeding 200 knots at the Sikorsky Development Flight Center. Raider, developed by Sikorsky, a Lockheed Martin (NYSE: LMT) company, is based on the company's proven X2 Technology, enabling speeds twice that of conventional helicopters. View the latest Sikorsky S-97 Raider video. "The Sikorsky S-97 Raider flight test program is exceeding expectations, demonstrating Raider's revolutionary speed, maneuverability and agility," said Tim Malia, Sikorsky director, Future Vertical Lift Light. "X2 Technology represents a suite of technologies needed for the future fight, enabling the warfighter to engage in high-intensity conflict anytime, anywhere as a member of a complex, multi-domain team." Sikorsky continues to demonstrate the application of its X2 Technology as the company prepares its proposal for the U.S. Army's Future Attack Reconnaissance Aircraft (FARA) competition, driving forward the Army's efforts to revolutionize its aircraft fleet as part of what is known as Future Vertical Lift. Raider incorporates the latest advances in fly-by-wire flight controls, vehicle management systems and systems integration. The suite of X2 Technologies enables the aircraft to operate at high speeds while maintaining the low-speed handling qualities and maneuverability of conventional single main rotor helicopters. "It's exciting to achieve these high speeds with X2 Technology," said Sikorsky experimental test pilot Bill Fell, a retired U.S. Army pilot. "It's undeniably important for the warfighter to get to the mission fast. And once they get there, X2 Technology provides the critical handling qualities that make the aircraft survivable, lethal and agile. Sikorsky X2 Technology changes the way we fly and fight – we can get there fast, be more effective while on the scene and we can get out fast." Sikorsky's X2 Technology at the heart of the Raider helicopter is scalable to a variety of military missions including light assault, light attack, armed reconnaissance, close-air support, combat search and rescue and unmanned applications. The development of X2 Technology and the Raider program has been funded entirely by significant investments by Sikorsky, Lockheed Martin and industry partners. For more information, visit www.lockheedmartin.com/raider. About Lockheed Martin Headquartered in Bethesda, Maryland, Lockheed Martin is a global security and aerospace company that employs approximately 100,000 people worldwide and is principally engaged in the research, design, development, manufacture, integration and sustainment of advanced technology systems, products and services. This year the company received three Edison Awards for ground-breaking innovations in autonomy, satellite technology and directed energy. SOURCE Lockheed Martin https://news.lockheedmartin.com/2018-10-04-Sikorsky-S-97-Raider-Exceeds-200-Knots-as-Company-Prepares-Proposal-for-U-S-Armys-Future-Attack-Reconnaissance-Aircraft

  • Iranian MOIS-Linked Hackers Behind Destructive Attacks on Albania and Israel

    21 mai 2024 | International, Sécurité

    Iranian MOIS-Linked Hackers Behind Destructive Attacks on Albania and Israel

    Iranian threat actor Void Manticore (Storm-0842) has been identified as the culprit behind destructive wiping attacks targeting Albania and Israel.

  • 'Excellent New Year's gift': Putin boasts after testing 'invulnerable' Russian hypersonic missile

    27 décembre 2018 | International, Aérospatial, C4ISR

    'Excellent New Year's gift': Putin boasts after testing 'invulnerable' Russian hypersonic missile

    The Kremlin said the Avangard missile successfully hit a designated practice target 6,000 kilometres away from its launch site The Associated Press , Vladimir Isachenkov MOSCOW — Russian President Vladimir Putin oversaw a test Wednesday of a new hypersonic glide vehicle, declaring that the weapon is impossible to intercept and will ensure Russia's security for decades to come. Speaking to Russia's top military brass after watching the live feed of the launch of the Avangard vehicle from the Defence Ministry's control room, Putin said the successful test was a “great success” and an “excellent New Year's gift to the nation.” The test comes amid bitter tensions in Russia-U.S. relations, which have sunk to their lowest level since the Cold War times over the conflict in Ukraine, the war in Syria and the allegations of Russian meddling in the 2016 U.S. presidential election. Putin's hopes for repairing ties with Washington under President Donald Trump have fizzled amid investigations into allegations of Trump's campaign ties with Russia, and tensions have escalated as the U.S. administration slapped Russia with new waves of sanctions. The Avangard was among the array of new nuclear weapons that Putin presented in March, saying that Russia had to develop them in response to the development of the U.S. missile defence system that could erode Russia's nuclear deterrent. In Wednesday's test, the weapon was launched from the Dombarovskiy missile base in the southern Ural Mountains. The Kremlin said it successfully hit a designated practice target on the Kura shooting range on Kamchatka, 6,000 kilometres away. “The Avangard is invulnerable to intercept by any existing and prospective missile defence means of the potential adversary,” Putin said after the test, adding that the new weapon will enter service next year with the military's Strategic Missile Forces. When first presenting the Avangard in March, the Russian leader said the new system has an intercontinental range and can fly in the atmosphere at 20 times the speed of sound, bypassing the enemy's missile defence. He emphasized that no other country currently has hypersonic weapons. Putin has said that Avangard is designed using new composite materials to withstand temperatures of up to 2,000 degrees Celsius (3,632 degrees Fahrenheit) that come from a flight through the atmosphere at hypersonic speeds. https://nationalpost.com/news/world/russias-putin-oversees-test-of-hypersonic-weapon

Toutes les nouvelles