History of Satellite Communications
The first idea of satellite communication came from an article in 1945 named Wireless World, where Author C. Clarke described the use of manned satellites in 24 hour orbits to distribute television programs. However, the first person to carefully evaluate the technical and financial aspects of such a venture was John R. Pierce of Bell Telephone Laboratories (Whalen, n.d.).
In a 1954 speech and 1955 article, Pierce described the usefulness of a communications "mirror" in space, a medium-orbit "repeater" and a 24-hour-orbit "repeater." In comparing the communications capacity of a satellite, which he estimated the capacity at 1,000 simultaneous telephone calls, and the capacity of the first trans-atlantic telephone cable, which could carry 36 simultaneous telephone calls at a cost of 30-50 million dollars, Pierce wondered if a satellite would be worth a billion dollars (Whalen, n.d.).
By the middle of 1961, RCA had a contract with NASA to build, a 4000 mile high, medium-orbit, active communications satellite called RELAY, AT&T was working on its own medium-orbit satellite called TELSTAR, and Hughes Aircraft Company had an exclusive contract to build a 24-hour orbit, 20,000 mile high satellite, called SYNCOM. By 1964, two TELSTARs, two RELAYs, and two SYNCOMs had operated successfully in space. The transponder technology used by AT&T in the TELSTAR I satellite is current technology in use today (Whalen, n.d.).
On April 6, 1965, a new company called COMSAT launched its first satellite, EARLY BIRD, from Cape Canaveral beginning Global satellite communications. The EARLY BIRD satellite provided almost 10 times the capacity of submarine telephone cables for almost 1/10th the price. Satellites are still competitive with cable for point-to-point communications, but the future advantage may lie with fiber-optic cable (Whalen, n.d.).
How Satellites Work
Orbit
First, as one would guess, satellites are launched into orbit. There are several types of orbit for satellites to follow but the main three are Low Earth Orbit (LEO), Medium Earth Orbit (MEO), and Geosynchronous Orbit (GEO). Satellites in a Low Earth Orbit are 100-300 miles above the earth's surface, and it must travel around 17,500 mph, circling the planet in about 10 minutes, to avoid gravity pulling them back to earth. In a Medium Earth Orbit, a satellite is 6,00012,000 miles above the earth and will circle the planet 4 to 6 hours. The Geosynchronous Orbit is a bit more complex, this orbit is 22,282 miles above the earth.
Radio waves were first discovered in 1887, but radio itself was initially invented by Italian Guglielmo Marconi in 1895 (1). His biggest mentioned success was in 1901, when he managed to broadcast the letter “S” across the Atlantic Ocean (1). However, he focused primarily on point-to-point transmissions, not large scale broadcasts from one point (F). As such, three American inventors - Lee De Forest, Edwin Howard Armstrong, and David Sarnoff - took credit for making radio as it is today a success (F). De Forest was born and raised in Alabama and he thought of everything in terms of patents and eventually held more than 300, but many claimed that he simply stole the inventions of others (2). In 1900, he patented a device to enhance weak signals and in 1902, he formed the De Forest Wireless Telegraph Company (1). In the same year. Reginald Fessenden, a Canadian, invented the “electrolytic detector”, which later became the spade detector that brought De Forest so much fame (F). In 1904, John Fleming invented the oscillation valve, which later became De Forest’s audion, and De Forest won the gold medal at the St. Louis World’s Fair for his “spade detector” (F). De Forest gained quite a bit of fame by broadcasting music live from the Eiffel Tower and from the Metropolitan Opera; however, many believed that this was a scam and that he had actually had the device broadcasting the signal only a few blocks away (F). In 1906, he envisioned bringing music and voices to all American households, but as it turns out Canadian inventor Fessenden had already broadcasted a Christmas greeting and music to the crew of a ship off the coast of Canada on Christmas Eve a year earlier (F). In 1912, Armstrong became prominent by inventing regeneration, wh...
R7 was test launched 5 times before the Soviet scientists got it to reach it target hight. They replaced the heavy satellite they had with Sputnik. It was just over 83 kilograms. With that success they launched another one on October 1,1957 and achieving the record of the first man made satellite in space.This was not just a military advancement, it was a man's dream come true.
The advanced technology that XM Radio uses is a big change from the old fashioned ways that FM and AM radio are broadcasted. XM Radio uses satellites in order to broadcast across the entire country with a clear signal. “XM satellites’ fixed orbits ensure a focused and consistent signal” (“Satellites” 2002). If the satellites need to be moved for any reason, no problems will occur with the broadcasting and ensures that the signals will not be lost (“Satellites” 2002). The ways in which were they were manufactured plays a big role in the quality of the signals that are sent to Earth. “The satellites were built by Boeing Satellite Systems, which is the world’s leading commercial manufacturer of satellites” (“Satellites” 2002). This was a smart decision by the makers of XM Radio because Boeing is such a well-respected company that it will ensure the confidence of needed consumers.
Launch of the herms in 1976 was world’s first direct to home experimental telecommunication satellite.
NSSS states a few current trends in space as being “congested and contested” (NSSS, 8), which is shaping our space strategic environment as well as fueling debates for space weapons. “Congested” trend refers to the current “60 nations and government consortia that own and operate satellites and the expectation to have 9000 satellite communication transponders in orbit by 2015.
In 1957 the Soviets used a missile to launch a satellite, Sputnik 1, into orbit around the earth. The arms race then became a space race as the United States rushed to launch its own satellites, some for military purposes.
In 1958, the United States’ first satellite, Explorer I, was launched. Rocket scientist Wernher von Braun directed the creation of this satellite, which was designed by the U.S. Army. This was also around the time that the president at the time, Dwight Eisenhower, signed a public order to create NASA, or the National Aeronautics and Space Administration. NASA is a federal agency that focuses on space exploration. Currently, NASA has quite a few rovers and orbiters out. They are also doing some advanced research.
NASA, National Aeronautics and Space Administration, was formed in 1958 shortly after the Russia launched of Sputnik and the R-7 ICMB Rocket. The administration was formed to research and progress anything that had to do with space, flight, or other aeronautics. Just over a year after the launch of Sputnik, on October 11, 1958 NASA launched its first rocket: Pioneer I. The primary purpose of this rocket was to measure magnetic fields around the Earth. Although the Sputnik projects had many of the same capabilities, the US having finally launched a rocket meant that they were really in the race.
In 1972, Charles Dolan and Gerald Levin of Sterling Manhattan Cable launched the nation's first pay-TV network, Home Box Office (HBO). This venture led to the creation of a national satellite distribution system that used a newly approved domestic satellite transmission. Satellites changed the business dramatically, paving the way for the explosive growth of program networks.
SIRIUS Satellite Radio was incorporated on May 17, 1990 as Satellite CD Radio Inc. On November 18th 1999 the company changed their name to SIRIUS Satellite Radio Inc, which is the name under which the FCC license to distribute satellite radio was given to. SIRIUS Satellite radio currently offers over 100 of music, news, sports, talk, entertainment, traffic, weather, and children’s programming to subscribers throughout the United States.
Plumb, Robert K. "Satellite is First Step Into Space." New York Times, October 5, 1957. [URL] Accessed May 22, 2003.
It was a difficult moment in the late 1950s in America. The Cold Ward was heating up on a political level. Suddenly, that all ended when the Soviet Union launched Sputnik 1 on October 4, 1957. This was the world’s first artificial satellite to orbit around Earth (Holland 112). As Todd Gitlin puts it, “When the Russians launched the first intercontinental ballistic missile and Sputnik in 1957, they blasted the national pride and stoked a national panic in America” (112). Politics controlled the race at first, but President Kennedy later shifted it towards a peaceful space exploration (Holland 114).
The Global Positioning System consists of three sections, 1.satellites which are orbiting the planet, 2.there are numerous control/monitoring centers here on the ground, and 3. gps receivers which are used by their owners. The satellites send down signals from orbit, which are received by GPS receivers on the ground in the air or on the water, the GPS receiver then converts this information into a location longitude, latitude and altitude along with time.
By the time the 20th century arrived, vacuum tubes were invented that could transmit weak electrical signals which led to the formation of electromagnetic waves that led to the invention of the radio broadcast system (750). These vacuum tubes were discovered to be able to transmit currents through solid material, which led to the creation of transistors in the 1960’s (750).
On October 4th, 1957, history was made when the Soviet Union launched Sputnik I, the first artificial satellite. The Sputnik I was only the size of a beach ball, it only weighed 183.9 lbs., and it was the marker for the “space race” between the U.S. and the Soviet Union. It was a huge technological achievement that caught the world’s attention and wound up making Americans disappointed that the U.S. did not send the first satellite into space. U.S. citizens were also concerned that if the Soviet Union could send satellites into space then they could posses the power to send ballistic missiles or nuclear weapons. Then, the Soviets raised the bar by sending Laika, the first living thing in space with a much heavier payload on November 3rd. Laika, meaning “barker” in Russian, was a stray mutt that was only three years old when she went to space. Laika was sent to space in a restrictive spacecraft that only had enough room...