GPS aids the navigation system for accurate measurement of vehicle location . Figure 2 provides an overview of navigation systems architecture used in the automotive industry. Coming to the navigation system architecture, it includes GPS antenna, GPS receiver, navigation computer, sensor interfaces, storage interfaces and a display unit.GPS antenna receives GPS signals from satellites. We have various GPS antenna configurations like, spiral helix, micro strip and planar rings. However, Popular among all is patch antenna.
What is GPS? The Global Positioning System (GPS) was developed by the Department of Defense and consists of a group of 24 satellites which are monitored by five ground stations. It essentially allows you to pinpoint your location anywhere on the surface of the Earth, even in cloudy weather, with the use of a GPS receiver. The GPS receiver is a navigational device that uses these satellites as reference points to calculate your position on the ground. It does this by triangulating your position between at least 3 satellites.
The pulses are then received by receivers on ships and airplanes helping to determine their positions in either time difference or longitude/latitude (Tetley et al, 2001). The hyperbolic system (Loran-C) utilise two lines of position... ... middle of paper ... ...y.org/collections/191-2/ [Accessed 16th April, 2014] Navigation Center (2012). Loran-C general information [online] Available at: http://www.navcen.uscg.gov/?pageName=loranMain [Accessed 16th April, 2014] Oxford Dictionaries (n.d.). Definition of navigation in English [online] Available at: http://www.oxforddictionaries.com/definition/english/navigation [Accessed 16th April, 2014] Proc, J. (2006).
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Keywords: GPS, WGS-84, UTM, Ionospheric errors, Northings and Eastings I. INTRODUCTION The space-based global navigation satellite system that provides reliable location and time information in all weather and at all times and anywhere on or near the Earth with sub-meter accuracy is called Global Positioning System (GPS) . It consists of a constellation of 28 satellites in six different orbits which give the information of the position of the user with sub meter accuracy . If there are four or more GPS satellites in unobstructed line of sight with the receiver, accurate spatial co-ordinates can be obtained . The datum obtained from the satellites, contain the information about the position and timing by calculating the the Keplerian orbit elements.
In this field, it is critical to determine the position of the camera (e.g. a missile, or an aircraft) with a greater precision than is available from GPS and flight data (e.g. compass, altimetry, bank, attitude) alone. Lockheed has developed a system that compares frames from a video feed with a simulated environment that represents ground truth for a given area, and builds a transformation matrix that can correct the GPS position to be obtain an even more accurate position. This allows targeting and fire control to be extremely precise.