transit 4a satellite
Transit spacecraft were developed for updating the inertial navigation systems on board US Navy Polaris submarines, and later for civilian use. Launched 1961. This was the navigation criterion demanded by the U.S. Navy, since American submarines would normally expose their UHF antenna for only 2 minutes to obtain a usable Transit fix. The navigation software used the satellite's motion to compute a 'trial' Doppler curve, based on an initial 'trial' location for the receiver. This receiver, power supply, punched tape unit, and antennas could fit in a number of padded aluminum cases and could be shipped as extra cargo on an airline. They measured the Doppler shift and transferred the data to 5-hole paper tape.
The computer would also receive from the ship's inertial navigation system (SINS) a reading of latitude and longitude.
The satellite, called Transit 4A, launched on June 29, 1961 atop a Thor-DM21 Able-Star rocket. Technical details about the TRANSIT 4A (1961-015A or NORAD 116) satellite. Launched 1962 - 1963. Transit 4B was a US Navy navigation satellite launched by a Thor-DM21 Able-Star rocket. Transit 4A, launched June 29, 1961, was the first satellite to use a radioactive power source (RTG) (a SNAP-3).
Launched 1961. Satellite 4-A was the first space vehicle to employ a radioisotope power supply (RIPS) and the first to switch power systems by command; 4-B was similarly configured.The history of Transit 4A and other early satellites in this 1979 report from the Johns Hopkins University Applied Physics Laboratory. Doppler data from this satellite confirmed that the equator of the earth is elliptical, not circular (long and short axes differ by approximately 250 feet).Transit 4-A and 4-B design represented the first departure from the sphere-shaped configuration of the earlier satellites; it resembled a modified drum and had an expandable outer shell covered with solar cells.
For the people mover at Sea–Tac, see Satellite predictions and other astronomical data customised for your location. The Transit satellite system, sponsored by the Navy and developed jointly by Development of the Transit system began in 1958, and a prototype satellite, Thousands of warships, freighters and private watercraft used Transit from 1967 until 1991. The Transit was a U.S. Navy satellite program to provide exact navigational positions regardless of surface weather. At the equator this delay between fixes was several hours; at mid-latitudes the delay decreased to an hour or two. TRANSIT 4A: Satellite Details. It may have been the first computer that implemented a single-cycle indirect addressing ability. This article is about the communications satellite. Transit 4A - Orbit: Home | Info. Therefore, unlike GPS, there was not an immediate accurate location of the Geoceiver location.
There were 41 satellites in the Transit series that were assigned the Transit name by NASA. A portable version of the ground station was called a Geoceiver and was used to make field measurements. Credit: Johns Hopkins University Applied Physics Laboratory The Transit was a U.S. Navy satellite program to provide exact navigational positions regardless of surface weather.
In addition, Transit 4A carried a nuclear power source SNAP-3 for testing. Since it was located on the surface of a moving ice sheet, its data was used to measure the ice sheet movement. Transit IV-A Transit 4A (the cylindrical spacecraft at the bottom), with its companion payloads, before launch in 1961.
Since only one satellite was usually visible at any given time, fixes could be made only when one of the satellites was above the horizon. TRANSIT 4A can be selected for live tracking or to see the passes visible from your location, if applicable Tracking 20988 objects as of 18-Jul-2020 HD Live streaming from Space Station Credit: Johns Hopkins University Applied Physics LaboratoryAccomplishments: Transit 4A met all launch objectives. The data from the fixed ground stations provided the location information on the Transit satellite orbit. Most of the spacecraft surfaces were covered with solar cells for use with nickel-cadmium batteries.
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