Sometimes I wonder how many sensors are really out there in a modern war zone. Sensors can now be made that run off a variety of sources such as solar, vibration, etc. I'd be surprised if the military doesn't have wind-powered sensors.
It's not hard to store data in a sensor, but not easy to get the data back "home." But one good way might be to "pool" information among a number of sensors and then have it picked up by a UAV. I like the idea of "grasshopper" sensors---sensors that hop from place to place. Seems like an efficient use of energy.
Sensors could be dropped off at one place by a UAV, disperse, gather info, and then re-converge to be picked up or debriefed by a second UAV visit. Sensors would not have to go to a pre-arranged spot---as long as they converged with each other utilizing signals. Then they could pull their resources to transmit a "find me" signal in response to a signal from the returning UAV.
