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Because radio and TV signals travel close to the ground, Silent Sentry 'provides superior illumination of low-flying threats,' according to a Lockheed Martin statement. Lockheed Martin officials call their technology Passive Coherent Location, and say it uses signals of near-resonant, continuous-wave transmitters such as commercial radio and TV stations. 'We`ve got something special here, and we don`t want to give it away.' That`s where our proprietary data begins.' Martin declined to say what type of signal processing semiconductors or algorithms the Silent Sentry system uses. She added, 'The next enabling technology is that Lockheed Martin has a distinguishing capability in our investment in the algorithms to process the signals in real time.

'When we compare it to tracking and scanning radars, its costs compare very well.' 'We don`t know of any other system doing the job the same way,' Martin says. Because they use COTS technology, users can scale the systems for two, four, or more of the high-capacity Silicon Graphics parallel processors. Previously, we were using with top-of-the-line capabilities.'Д¬omplete Silent Sentry systems range in cost from $3 to $5 million. Another enabling technology is that the processors have come down in price. 'We`re using Silicon Graphics XL processors. 'The first and foremost enabling technology for this system is enhanced signal processing power,' Martin says.

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Subsequently, the Silent Sentry research project transferred to Loral and thence to Lockheed Martin in a series of corporate mergers. The Silent Sentry system first was conceived 15 years ago at IBM, says Lorraine Martin, director of command and control technology programs for Lockheed Martin Mission Systems.

'They give Silent Sentry broad application for a wide range of surveillance tasks, and unlimited access to broadcast signals for accurate, precise detection of targets.' 'Television and radio transmissions blanket the Earth and extend into the far edges of space,' says Terry Drabant, president of Lockheed Martin Mission Systems. 'This quality gives it a superior level of security for surveillance operations, and is also an environmentally friendly solution,' according to a Lockheed Martin statement. As a passive system, Silent Sentry transmits no radio frequency 'signature' that could attract enemy anti-radiation missiles or trigger countermeasures. Silent Sentry also can detect and track threats as small as remotely piloted vehicles and drones, Lockheed Martin officials say. Silent Sentry detects airplanes, helicopters, cruise missiles, ballistic missiles, re-entry vehicles, and rockets in real time with high accuracy, Lockheed Martin officials say. The Silent Sentry System uses commercial TV and radio signals that broadcast in the 40 to 100 MHz frequency range.

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Commercial off-the-shelf (COTS) signal processing hardware and COTS visualization software form essential parts of the Silent Sentry surveillance system, a passive radar product family that Lockheed Martin Mission Systems of Gaithersburg, Md., recently unveiled.

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In Detroit, three days after the drug interdiction, the price of a vial of crack cocaine increases substantially. The DEA aircraft, had help from a passive ground-based radar system, which used the reflected signals from two country music radio stations and a PBS TV affiliate broadcasting 'Sesame Street' to an early morning audience. How did those DEA pilots find the smuggler aircraft, or even know it was there? DEA markings flank the smuggler`s craft and waggle their wings, signaling the DC-9 to land. Without warning, two Gulfstream executive jets emblazoned with U.S. The pilot lights a cigar as dawn breaks over the Gulf and the DC-9 enters U.S. They assure the supercargo that the Drug Enforcement Administration`s electronic defenses are inactive or evaded, and the smuggling flight can continue. In the cockpit the pilot and co-pilot, their faces illuminated by the glow from the instrument panel, check multiple radar warning receivers. In the cargo bay, hundreds of neatly wrapped bricks of cocaine lie stacked on freight skids, forming tens of millions of dollars of contraband. A darkened DC-9 cargo jet skims at low altitude across the Gulf of Mexico during a night flight north.