What is A-GPS
A-GPS, short of Assisted GPS, is a combination of GSM base station and GPS technology, used to improve the performance of GPS and work with GSM/GPRS, WCDMA and CDMA2000. In order to use A-GPS, GPS module is needed and location based service should be establish on mobile internet. Because of usage of network location data, receiver does not have to download and decode data from GPS satellites, so it has more time and capacity to track GPS signal, which could eventually reduce first location time, and increase sensitivity.
Advantages of A-GPS compared to GPS
- Location accuracy. At open place with good GPS signal, its accuracy is around 10 meters. Because of high buildings and trees or bad weather, GPS signal is not stable and leads to error in location.
- Fast first location. Normally it takes 2 to 5 minutes to first locate by GPS, however A-GPS just takes 10 secs around to locate.
In other word, A-GPS is to add an assistant function to traditional GPS, which is to make up the short come of GPS which takes longer time for first location. Before GPS receiver catches satellite signal, A-GPS helps download satellite data and forwards to GPS receiver, so as to find satellite directly other than wait.
Disadvantages of A-GPS compared to GPS
- A-GPS consumes more power.
- A-GPS cost GPRS data.
According to above message, A-GPS is helpful to GPS tracker. For example, when GPS tracker is newly installed, fast first location saves time. Also, when GPS tracker goes from GPS blind area to open place, A-GPS helps to get GPS tracker located and reduce GAP on real time tracking software and increase mileage accuracy.