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... on-orbit checks to make the spacecraft function." In its initial 6-hr orbit, the NavStar had "talked" with ground controllers around the world, each of whom fine-tuned the satellite as it passed overhead. Two days after launch NavStar 2's internal rocket motor, activated by a command from a satellite controller, had shifted ... orbit, slowly moving it toward the final position most suitable for the NavStar program. By the mid-1980s the NavStar system of 24 satellites would give users highly accurate data on position ...

... lines of longitude faster than the onboard screen could update them. Although testing of the Navstar GPS using the 13-52 was almost complete, production integration was just beginning. The production phase of Navstar GPS required bringing the three segments-space, user, and control-to full operational capability. The ...

... the rubidium-vapor atomic clocks had delayed launch of NavStar 2 for a day; when ground tests indicated a malfunction of the NavStar frequency-divider circuit, the USAF had ordered modifications of all three clocks on NavStar 2 to prevent a similar occurrence in orbit. The USAF planned to launch a third NavStar from ...

... normal distribution channels, said the price of a NavStar receiver in 1978 dollars could eventually be as low as $2000. The role of NavStar (DOD's satellite-based navigation system) in civilian ... at least as accurate as the present VOR/DME navaids. The potential market for civilian NavStar receivers had aroused considerable interest among civil-avionics manufacturers, resulting in Langley Research Center 's ...

... boattail area of the Atlas F (recorded in telemetry from the launches of NavStar 1 in Feb. and NavStar 2 in May) had forced postponement for at least 14days of SEASAT-A ... impinging on the boattail. Temperatures in the boattail had climbed earlier than expected during the NavStar launches; in one launch, that area had become hot enough to melt insulation on copper ... launch, program officials noted. They had not decided whether to postpone launch of the third NavStar satellite, planned for Aug. (Av Wk, June 12/78, 18) Av Wk reported MARSHALL SPACE ...

... of 63° inclination at about 11 600mi altitude. First of a system to be called NavStar, the Nts 2 carried two cesium-beam time standards (atomic clocks) to produce precise time ... and 14 solar-cell experiments for its builder, the Naval Research Laboratory. The joint service NavStar system upon completion would consist of 24 satellites (8 in each of 3 circular-orbit ... location within 33ft, his speed within about 4in/sec, and the correct time. Uses of NavStar would include tactical missile navigation and precision delivery of weapons; aid to space, air, land ...

... Geographic Magazine The USAF announced it had launched a second prototype satellite in DOD's NavStar global-positioning system from SAMTEC facilities aboard an Atlas F booster. The 955-lb navigational satellite working with a previously orbited NavStar satellite would be part of the program's concept-validation phase using six satellites to ...

... Rockwell International Corp. to design, develop, fabricate, launch, and operate three prototype satellites in the NAVSTAR Global Positioning System. Included in the contract were associated hardware, qualification model, and computer programming and services. In addition, two navigation subsystems would be delivered for use aboard a NAVSTAR satellite to be developed by the Naval Research Lab-oratory. When completed, the 24 satellites ...

... might seek its own joint effort with the USSR. Also, the Dept. of Defense's NavStar system, designed mainly for military navigation users through a secure signal system, had offered a ... . radio-technical commission for aeronautics that they had been keeping tabs on NavStar development) were apparently more enthusiastic prospects for NavStar than U.S. users. (Av Wk, June 27/77, 17) May ...

... News for this day. (1MB PDF) An Air Force Delta 2 launch vehicle carrying a NAVSTAR satellite was successfully launched from Cape Canaveral Air Force Station in Florida. The 126-foot Delta 2 placed the NAVSTAR navigation satellite in a preliminary orbit, from where it would boost itself into a 12,000-mile circular orbit. The NAVSTAR was the third of an eventual network of 21 satellites that would comprise the Global ...

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