| 2. | However , although gps can provide worldwide real - time positioning service , the fatal shortcoming is that the positioning precision can be reduced sharply owing to the weak satellite signal which is blocked by buildings and trees etc . fortunately , gsm / gprs network can work and provide positioning service can transmit the position messages to remote users or servers
然而, gps定位虽然能实现全球范围内的实时定位,但是对于gps来说,其很大的一个缺点是跟踪卫星的信号常常由于建筑物及树木等的遮挡而使gps的定位精度大大降低,甚至无法进行正常的导航和定位。而基于gsm / gprs网络的位置服务恰恰能弥补gps定位的这一缺点,并且gsm / gprs网络能将位置信息传送到远端。 |
