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Northrop Grumman-Built Antenna Deploys To Seek Water Under Mars
Redondo Beach CA (SPX) Sep 20, 2006 An antenna built by Northrop Grumman Corporation deployed successfully September 16 onboard NASA's Mars Reconnaissance Orbiter (MRO) for an experiment that continues the search for liquid or frozen water in the first few hundreds of feet of Mars' crust. SHARAD's antenna, weighing less than three kilograms (6.6 pounds), deployed to a length of 10 meters (33 feet) to provide the configuration required once the spacecraft reached its circular, two-hour orbit around Mars. The antenna was built by Astro Aerospace, a business unit of Northrop Grumman's Space Technology sector, for the Italian Space Agency's SHAllow RADar (SHARAD) experiment. The SHARAD experiment was built by Alcatel Alenia Space Italia and flown on the NASA spacecraft. NASA's Jet Propulsion Laboratory, operated by the California Institute of Technology, manages the MRO mission for NASA's Science Mission Directorate. "This represents another successful on-orbit achievement by a Northrop Grumman system, adding to an impressive record of more than 2,000 flawless deployments," said Tom Romesser, vice president of technology development for Northrop Grumman Space Technology. "Astro Aerospace alone, among designers and manufacturers of space deployables, has a 100 percent success rate on hundreds of flight-specific deployable units." SHARAD will probe Mars' subsurface using radar waves using a 15-25 MHz frequency band to get the desired high depth resolution. The radar wave return, which is captured by the SHARAD antenna, is sensitive to changes in the electrical reflection characteristics of the rock, sand, and any water present in the surface and subsurface. Water, like high-density rock, would have a very strong radar return. Changes in the reflection characteristics of the Martian subsurface, such as layers deposited by geological processes over the life of the planet, also can be detected. This antenna uses a similar technology to the MARSIS antenna built by Astro Aerospace for the European Mars Express spacecraft. Last year, the MARSIS antenna deployed to 40 meters (132 feet) length onboard the Mars Express once it entered the desired orbit around Mars. For more than 40 years, Northrop Grumman's Astro Aerospace has pioneered the technology of space deployable structures including AstroMesh furlable antennas and reflectors, truss masts, telescopic booms, storable tubular extendible members and planar-array deployment. Related Links Mars Reconnaissance Orbiter Mars News and Information at MarsDaily.com
NASA Rover Nears Martian Bowl Goal
Pasadena CA (JPL) Sep 20, 2006NASA's Mars rover Opportunity is closing in on what may be the grandest overlook and richest science trove of its long mission. During the next two weeks, the robotic geologist is likely to reach the rim of a hole in the Martian surface wider and deeper than any it has visited. The crater, known as "Victoria," is approximately 750 meters (half a mile) wide and 70 meters (230 feet) deep. |
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