| As an auto tracking device, GPS is widely used in | | | | satellites signals, then we can calculate a |
| various human activities. Not only used on aircraft, | | | | 3-dimensional position (x, y, z = height) |
| ships, cargo car (vehicle tracking) but also serves | | | | Global Positioning System Accuracy |
| as the personnel tracking systems for individual | | | | 1. Many factors affect the accuracy of the |
| interests. Global Positioning System as a tracking | | | | position, of one of them is the atmosphere. |
| system of course is a bit complex to learn. Here | | | | 2. As a tracking system on flight application, GPS |
| is the tutorial for beginners, as a basic description | | | | can reach accuracy of approximately 5 meters. |
| of this device. | | | | 3. To further improve the position accuracy, a |
| GPS System consept | | | | facility called WAAS (wide area augmentation |
| 1. GPS satellites moving around the earth in the | | | | system) can be used, which provides accuracy of |
| orbital 2 times a day | | | | ± 3-8 meters. WAAS facility does not need |
| 2. Each Global Positioning Sytem satellite transmits | | | | special equipment to get WAAS signals, as long as |
| data signals to the earth and the data signals are | | | | there is GPS receiver or WAAS Ground |
| used to calculate the position of a point on the | | | | 4. To further improve the accuracy DGPS is used |
| earth | | | | which can increase the accuracy to ± 3-5 |
| 3. To calculate the position, the GPS transmits | | | | meters. |
| time difference is calculated as the distance from | | | | Global Positioning System Satellite |
| the GPS satellites to the earth's surface or to a | | | | 1. First Global Positioning System satellite was |
| GPS receiver on earth. | | | | launched in 1978, and until the year 1994 there |
| 4. In order to calculate a position, it requires | | | | were 24 satellite GPS. Therh are more than 30 |
| minimum 3 GPS satellite signals which are | | | | GPS satellites now. |
| captured by our GPS receivers on earth. By | | | | 2. Global Positioning Sytem satellite age average is |
| getting signals from GPS satellites we can | | | | 10 years, so if it had passed 10 years routine |
| calculate the 2-dimensional position of x and y | | | | maintenance should be done or replaced. |
| 5. When a GPS receiver can receives at least 4 | | | | 3. |