A-GPS (Assisted GPS)
Assisted GPS (abbreviated as A-GPS) is utilized to accelerate start-up times of GPS-based systems. GPS may have issues getting a lock when the signal is weak and in such a case A-GPS would help with getting a lock.
Then again, a cell phone with a GPS chipset requires no data connection to acquire and process GPS information into a position arrangement, since it gets information straightforwardly from the GPS satellites and can compute a position fix itself. Nonetheless, the accessibility of an information association can give help to enhance the execution of the GPS chip on the cell phone.
Assistance falls into two classifications:
1.) Mobile Station Based (MSB): Information used to gain satellites all the more quikcly.
- It can supply orbital information to the GPS receiver, empowering the GPS collector to lock to the satellites quickly sometimes.
- The system can give precise time.
2.) Mobile Station Assisted (MSA): Calculation of position by the server utilizing data from the GPS receiver.
- The device catches a snapshot of the GPS motion, with surmised time, for the server to later process into a position.
- The server has a decent satellite signal strength and copious calculation power, so it can contrast fragmentary signs handed-off with it.
- Surveyed and Accurate coordinates for the phone site towers permit better knowledge of nearby ionospheric conditions and different conditions influencing the GPS signal than the GPS recipient alone, empowering increasingly exact estimation of position.