GPS is a navigational aid that is satellite based. It is made up of a network of 24 satellites in orbit around the world. The first satellite was launched in 1978 and the last was put into orbit in 1994. Every 10 years another satellite is put into orbit because each satellite is made to last that amount of time. The system began as a military application but in the 1980’s the government decided to make it available to everyone, anywhere, anytime. The system finds your position by measuring the time it takes to receive the signal back to the satellite. It then does that with other satellites to triangulate your position in relation to the earth. To calculate a position in 2D the system has to be locked on to at least three satellites, but for a 3D representation you need to be locked on to at least 4 satellites. Once the position is found the GPS can calculate much more info like speed, bearing, track, distance, etc… The GPS system is very accurate; Garmin (a leader in GPS technology) states that their newest receiver is accurate up to an average of 15 meters.
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.
Recently phones have become a substitute for gps in cars. Due to the remarkable updates in map application in phones the gps in cars have become a nuisance while the cell phone is less bulky and has an easier interface. The gps in phones has made driving to unknown places easier than ever. Not only does it help guide in a car but it also guides you while walking and even by the
Before detailing the reasons for the importance of the compass, it is important to first know about its creation. The Chinese first created a compass-like instrument during the Han dynasty between three hundred and two hundred BC. The Chinese made these rudimentary compasses out of lodestone, whose magnetic properties the Chinese had already discovered by circa 300 B.C. It was then fashioned into a ladle shaped, and laid on a flat bronze plate. While the compass was not primarily used for direction, it was used in such manner as early as four hundred B.C., as evidenced in The Book of the Devil Valley Master where the jade hunters were described as taking a “south pointer” so to not get lost. However, the Chinese only began to use the compass in large scales for naval and terrestrial navigation around the eleventh...
The space segment is the constellation of satellites from which users make ranging measurements. The SVs transmit a PRN-coded signal from which the ranging measurements are made. This concept makes GPS a passive system for the user with only signals being transmitted and the user passively receiving the signals. Thus, an unlimited number of users that can use GPS simultaneously. A satellite’s Transmitted ranging signal is modulated with data that includes the information that defines the position of the satellite. An SV includes payloads
The Global Positioning system has come a long way since William Guier and George Weiffenbach chose to mess around with Sputnik’s location in its orbit. It has gone from being one of the most secretive projects ever developed to being one of the most popular and mostly used technologies in our modern day lives. There is no doubt that the future of GPS technologies hold many more bright and innovative ideas that could once again change how our society lives.
The following is a brief illustration of the principles of GPS. For more information see previous chapter. The Global positioning System (GPS) is a satellite-base navigation system that provides a user with proper equipment access to positioning information. The most commonly used approaches for GPS positioning are the Iterative Least Square (ILS) and the Kalman Filter (EKF) methods. Both of them are based on psuedorange equation:
Google maps an application that helps you to find any place in the world because it provides you with a map.
There was a time a person would use a roadmap to get from one location to another. Some also would stop and ask for directions. Today, you seldom see paper maps and people stopping at a local gas station for directions. Many vehicles come with a navigation system that provides a real-time map of the vehicle’s current location as well as systematic directions to requested destination.
The GPS obtain signal from at least three satellites to get accurate reading of your position. The equation for measuring the distance from a satellite equation is “distance=speed of light (186,000mi/sec) time”. They can establish location within 1 centimeter and provide accurate time. There are 24 satellites that circle the earth. They circle in a precise orbit and sends signals to earth. GPS systems work in any weather condition. Time difference tells the receiver how far the satellite is. Once your position has been found, the GPS can calculate other information, such as speed, bearing, track, trip distance and distance to destination. They are powered by solar energy. They even have back up batteries for when there’...
with a digital map, who shows the position of the car. Based on the position of
The Global Positioning System, more commonly called the GPS is a satellite based system that provides navigation for almost everything from cell phones to automobiles. This wonderful technology is very vital in today’s economy because of its prominence in banking, financial markets, power grids, farming, construction and so much more. It also protects human life by preventing accidents, helping in search and rescue missions and is critical to nearly every facet of military operations. There are three segments that make up the global positioning system: the space segment, the control segment and the user segment. The segment we are familiar with is the user segment. The user segment is what receives GPS signals, determines the distance between a satellite and a receiver and solves the navigation equations, all in order to obtain the coordinates of a specific place. The space segment consists of 31 satellites but there is an availability of at least 24 satellites that are approximately 6 000-12 000 miles above the earth.
GPS is a system of satellites radio-transmitters that orbit the planet in great numbers; their purpose is to be able to pinpoint the exact location of an individual or any type of vessel that is equipped with a receiver transmitter within a very small radius. GPS navigation has had a great impact upon society in general as well and its commercial and military applications. Global Positioning is made available at no cost to anyone who has a GPS receiver unit anywhere on the planet. A GPS unit is able to give the user longitude/latitude information as well as, altitude, traveling speed, distance traveled, distance remaining and time in any type of weather conditions imaginable.