A study of global position system (GPS) receivers
Summary :
Table of Contents
- Abstract
- Introduction
- Embedded system
- History and advantages
- Hardware description
- Block diagram
- Circuit description
- GPS receiver
- GSM modem
- Microcontroller (PHILIPS XA-G39)
- LCD display
- Serial communication (RS 232)
- Power supply
- Flow chart of GPS/GSM
- Working of GPS
- Software description
- AT commands
- KEIL software and programming
- Program of the project
- Accuracy
- Applications
- Improvements
- Bibliography
Abstract
With today's global position system (gps) receivers, we are able to pinpoint our own position, but what's more useful about gps receivers is that they can transmit our position information to other receivers. We decided to use both of these features to create a wireless vehicle navigation system.
To design the navigation system, we combine the gps ability to pinpoint location along with the ability of the global system for mobile (GSM) to communicate with a remote system (Mobile Phone) in a wireless fashion. Information from the Satellites is displayed on graphical LCD.
The global positioning system, usually called gps, is the only fully-functional satellite navigation system. A constellation of more than two dozen gps satellites broadcasts precise timing signals by radio, allowing any gps receiver (abbreviated to GPSr) to accurately determine its location (longitude, latitude and altitude)in any weather, day or night, anywhere on earth.
gps allows receivers to accurately calculate their distance from the gps satellites. The receivers does this by measuring the time delay between the signal sent by satellite and the local time when the signal is received. This delay, multiplied by the speed of light, gives the distance to that satellite. The receiver also calculates the position of the satellite based on information periodically sent in the same signal. By comparing the two, position and range, the receiver can discover its location.
To design the navigation system, we combine the gps ability to pinpoint location along with the ability of the global system for mobile (GSM) to communicate with a remote system (Mobile Phone) in a wireless fashion. Information from the Satellites is displayed on graphical LCD.
The global positioning system, usually called gps, is the only fully-functional satellite navigation system. A constellation of more than two dozen gps satellites broadcasts precise timing signals by radio, allowing any gps receiver (abbreviated to GPSr) to accurately determine its location (longitude, latitude and altitude)in any weather, day or night, anywhere on earth.
gps allows receivers to accurately calculate their distance from the gps satellites. The receivers does this by measuring the time delay between the signal sent by satellite and the local time when the signal is received. This delay, multiplied by the speed of light, gives the distance to that satellite. The receiver also calculates the position of the satellite based on information periodically sent in the same signal. By comparing the two, position and range, the receiver can discover its location.
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