An algorithm which can locate soldiers and vehicles , such as robots , when GPS is not available has been developed by researchers at the US Army Research Laboratory . In a military situation where vehicles have been disabled , or in an environment with obstacles , GPS may be ineffective for localising personnel . However, such solutions are not suitable for the military environment. The latest technology makes use of the received signal strength of a radio frequency source to determine its time of arrival . By taking a number of readings from the signal , the algorithm can ascertain the geographic location of the source , in a technique known as spatial sampling .
An algorithm which can locate soldiers and vehicles , such as robots , when GPS is not available has been developed by researchers at the US Army Research Laboratory . In a military situation where vehicles have been disabled , or in an environment with obstacles , GPS may be ineffective for localising personnel . The latest technology makes use of the received signal strength of a radio frequency source to determine its time of arrival . By taking a number of readings from the signal , the algorithm can ascertain the geographic location of the source , in a technique known as spatial sampling .