The Transit was a U.S. Navy satellite program to provide exact navigational positions regardless of surface weather. There were 41 satellites in the Transit series that were assigned the Transit name by NASA. The software would then perform a If the receiver was also moving relative to the earth, such as aboard a ship or airplane, this would cause mismatches with the idealized Doppler curves, and degrade position accuracy. During a satellite pass, a GE receiver would receive the orbital parameters and encrypted messages from the satellite, as well as measure the Doppler-shifted frequency at intervals and provide this data to the AN/UYK-1 computer. Technical details about the TRANSIT 4A (1961-015A or NORAD 116) satellite. Transit 4A (the cylindrical spacecraft at the bottom), with its companion payloads, before launch in 1961. At the equator this delay between fixes was several hours; at mid-latitudes the delay decreased to an hour or two. It carried a SNAP 3 nuclear power source.
It may have been the first computer that implemented a single-cycle indirect addressing ability. Transit 4A - Orbit: Home | Info.
Launched 1962 - 1963. 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. Most of the spacecraft surfaces were covered with solar cells for use with nickel-cadmium batteries. 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. Transit 4B (1961) also had a SNAP-3 RTG.
Launched 1961. This article is about the communications satellite.
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. Locating a Transit satellite in earth orbit from a known ground station using the Doppler shift is simply the reverse of using the known location of the satellite in orbit to locate an unknown location on the earth, again using the Doppler shift . A portable version of the ground station was called a Geoceiver and was used to make field measurements. For its intended role as an updating system for SLBM launch, Transit sufficed, since submarines took periodic fixes to reset their With later improvements, the system provided single-pass accuracy of roughly 200 meters, and also provided The basic operating principle of Transit is similar to the system used by Each Transit system satellite broadcast two UHF carrier signals that provided precise time hacks (every two minutes), plus the satellite's six The Transit satellite broadcast on 150 and 400 MHz. In the 1970s, the After 1996, the satellites were kept in use for the Navy Ionospheric Monitoring System (NIMS).The orbits of the Transit satellites were chosen to cover the entire Earth; they crossed over the poles and were spread out at the equator. Transit 4A was a relatively small spacecraft. For the people mover at Sea–Tac, see Data was taken over a period of time, typically a week, and sent back to the Satellite Control Center for processing. This data was sent to the Satellite Control Center at Applied Physics Laboratory in Laurel, Maryland using commercial and military teleprinter networks. Other Geoceivers were taken out in the field in Antarctica during the summer and were used to measure locations, for example the movement of the Since no computer small enough to fit through a submarine's hatch existed (in 1958), a new computer was designed, named the AN/UYK-1 (TRW-130).In the AN/UYK-1 instruction set, the machine-language instructions had two operators that could simultaneously manipulate the arithmetic registers—for example, complementing the contents of one register while loading or storing another. It was launched with two other spacecraft from the same launch vehicle. 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. Transit IV-A Transit 4A (the cylindrical spacecraft at the bottom), with its companion payloads, before launch in 1961. TRANSIT 4A: Satellite Details. Credit: Johns Hopkins University Applied Physics LaboratoryAccomplishments: Transit 4A met all launch objectives.
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