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Ancient travelers relied on celestial objects, such as stars, to find their way. GPS users also use celestial objects—satellites—to navigate. There are, of course, vast differences between a star and an earth-orbiting man-made object. You observe a star to navigate; a satellite is invisible to the naked eye, but you use its position data, or ephemera, to navigate. Modern navigators no longer have to wait for nightfall and clear skies, and, thanks to atomic clocks, they can receive precise position data continuously. According to the National Academy of Sciences, in 1957 scientists observing the newly launched Sputnik realized they could predict its position by measuring the increase and decrease in frequency of its radio signal as it orbited the earth. This observation confirmed that a satellite’s position in space could be accurately determined from the ground, which meant a satellite could determine the accurate position of an object on or above the ground, such as a hiker or a hang ...

GPS - the Global Positioning System - is a navigation revolution. It’s a technology that pinpoints a user’s location anywhere in the world, 24 hours a day, regardless of the weather. Designed by the United States’ Department of Defense for use by the military, the GPS System was made available to civilians for use in aviation, marine surveying and general outdoor/recreation markets. Today, millions of people utilize the accuracy and convenience of this amazing technology to hunt, fish, hike, fly, cruise and sail. GPS consists of a constellation of 24 satellites orbiting some 12,000 miles above the earth. These satellites transmit signals containing time and orbital data to calculate satellite position and almanac data. Meanwhile, receivers used on the ground, sea and air search the sky for the satellites. The GPS unit needs to acquire good signals from at least three satellites to determine a position on the surface of the earth. A fourth signal is required to get three-dimensional pos...

A tracking device can simultaneously receive signals from 4 up to 11 satellites, if the receiver is on the surface of the earth. Under this condition, there are two approaches to solve the problem. The first one is to use all the satellites to calculate the user position. The other approach is to choose only four satellites from the constellation. The usual way is to utilize all the satellites to calculate the user position, because additional measurements are used. In order to focus on this subject only the four-satellite case will be considered. If there are more than four satellite signals that can be received by a GPS receiver, a simple way is to choose only four satellites and utilize them to solve for the user position. Under this condition, the question is how to select the four satellites. Let us use a two-dimensional case to illustrate the situation, because it is 24 BASIC GPS CONCEPT easier to show graphically. In order to solve a position in a two-dimensional case, three sa...

A Global Positioning System (GPS) is a group of 24 earth-orbiting satellites, providing location and time in all weather, anywhere on or near the Earth, where there is an unobstructed line of sight to four or more GPS Satellites. This system of satellite can work in any weather condition, operate 24/7/365 and travel at roughly 7,000 miles an hour. A GPS receiver uses a triangular calculation to pinpoint a user’s exact location buy comparing the time a signal was transmitted with the time it was received by a satellite. The control segment of GPS ( GPS tracking device ) consists of a master control station (MCS), a worldwide network of monitor stations, and ground control stations. The MCS, located near Colorado Springs, Colorado, is the central processing facility of the control segment and is manned at all times. There are five monitor stations, located in Colorado Springs (with the MCS), Hawaii, Kwajalein, Diego Garcia, and Ascension Island. The positions (or coordinates) of these...

For ages people have been looking for ways to find locations and identify directions to different places. It all began in the first century when the Chinese used lodestone ladles whose handles always pointed towards the south no matter what direction they were placed in. In the year 1978, a Block-I GPS satellite was launched. It was basically used for defense purposes. Another milestone in the GPS system is the development of Topologically Integrated Geographic Encoding and Referencing (TIGER) a digital map that allowed users to create virtual maps. This digital map was released in 1989, and sometime before that in 1983, the US president had declared that the GPS system would be made public for everyone to use. Both these factors speeded up the process of the designing and development of GPS-enabled tracking devices in the world. Over the next few decades, more research institutions and IT-based companies began to create devices based on GPS. Now, GPS has become so commonplace that...

It’s fun to uncover something that you aren’t supposed to know about — many software applications and movies on DVD contain what are known as “easter eggs.” However, imagine finding something that you aren’t supposed to find that turns out to be useful and informative. In this article, we are going to hunt for GPS easter eggs, delving into the secrets that lie behind the standard menus on your GPS unit to find useful features and diagnostic screens that can give you information about your system and troubleshoot problems that you might have. There’s a lot of information to find — technical information, diagnostic information, and more. Let’s begin our tour of the secrets of Magnetic GPS . How GPS Works The basic principle behind GPS is straightforward: The GPS receiver picks up a signal from three or more of the satellites and then uses this information to calculate the distance to the satellites. This information is, in turn, used to determine a location on the globe where th...

A BRIEF HISTORY PRIOR TO atomic clocks, quartz-movement watches kept the most accurate time. Quartz time, based on the vibrations of a quartz crystal, is accurate to about one thousandth of a second perday. But with radio signals traveling at the speed of light, a clock that is off by even a thousandth of a second will produce a gross position error. Atomic clocks, accurate to within 1 second every 100,000 years, derive their precision from the highly predictable gains and losses of energy by atoms. These clocks, accurate to a billionth of a second, are key to the success of GPS. Ancient travelers relied on celestial objects, such as stars, to find their way. GPS users also use celestial objects—satellites—to navigate. There are, of course, vast differences between a star and an earth-orbiting man-made object. You observe a star to navigate; a satellite is invisible to the naked eye, but you use its position data, or ephemera, to navigate. Modern navigators no longer have to wait ...

Jimi Electronic, a professional provider of wireless smart cars and smart homes devices, announces a Business Alliance with Concox Information &Technology Co., Ltd, leading designer and manufacturer of telematics and wireless communications solutions.   Under the alliance, Jimi and Concox would join hands to realize the superiority of advantage integration, resources conformity and managerial collaboration effect. Integrated with existing hardware and software strength, the alliance would strive to offer industry-leading design of high quality.    By combining the overseas sales and marketing forces, Jimi and Concox are resolved to deliver far more experienced and thoughtful service to clients. Any inquiry or question would get its fast response from a dedicated team.   Marching forward, the alliance will take proactive measures to develop their two brandings, CONCOX for GPS tracking devices and JIMI for smart vehicle DVR andsmart home series. Suppor...