全球定位系统(GPS)：
全球定位系统向位于地球表面上或附近任何位置的 GPS 接收器提供基于时间和位置的信息。 GPS 可在所有天气条件下工作，前提是与 4 颗或更多 GPS 卫星进行无障碍视线通信。 GPS 由美国空军管理。
- GPS系统组成：
- 空间段
- 控制段
- 用户细分
卫星导航系统(SNS)：
卫星导航系统是使用卫星提供自主地理空间定位的系统。它允许小型电子接收器以高精度确定其位置。它基于在中地球轨道上传输无线电信号的广泛人造卫星网络。
GNSS 包括三种主要的卫星技术：
- 全球定位系统
- 格洛纳斯
- 伽利略
让我们看看GPS和卫星导航系统之间的区别：
| S.NO. | GPS | Satellite Navigation System |
|---|---|---|
| 1 | GPS is a fully-functional satellite-based navigation system. | Satellite navigation is a system based on a wide network of artificial satellites. |
| 2 | GPS satellites transmit continuous microwave radio signals composed of two carriers, two codes and a navigation message. | It describes constellation of satellites that provide navigation, positioning and timing services globally. |
| 3 | GPS is maintained by the U.S. Department of Defense. | It provide autonomous geospatial positioning |
| 4 | GPS satellites broadcast timely signals via radio to the GPS receivers. | Satellite navigation systems help us to drive across unknown roads, whether by land, sea or air, etc. |
| 5 | GPS is a joint name for group of satellites that are orbiting around the earth. | Satellite Navigation is a special software that makes use of GPS signals |
| 6 | It processes the signal using its built-in software. | The position, velocity and time estimates obtained from the satellite navigation system. |