Abstract
Gradient-based methods of radio-frequency localisation can be used to track and locate an unknown radio-frequency (RF) emitter. However, due to the nature of wireless propagation, the signal gradient is not smooth. To overcome this issue, this paper considers the use of a swarm of mobile sensors that exploits its geographic distribution and network topology to effectively locate a continuously transmitting source in a distributed fashion. Simulation experiments show encouraging results for the swarming approach. Performance trade-offs in the swarm configuration are also explored.