Unmanned Systems Technology 023 I Milrem Multiscope I Wireless charging I Logistics insight I InterGeo, CUAV London & USA show reports I VideoRay Defender I OS Engines GR400U-FI I Ultrabeam Hydrographic Ultra-2 I IMUs

Platform one An IP mesh radio network developed by Domo Tactical (DTC) is being used to broadcast video from a remotely operated Warrior infantry vehicle to handheld devices in the field (writes Nick Flaherty). The Warrior is remotely operated by the Marionette controller produced by Digital Concepts Engineering. The MANET mesh network tolerates poor deployment, as the nodes automatically connect (or mesh) with surrounding units, with data routed automatically. DTC uses the Dijkstra’s Algorithm, a cost table routing approach based on the signal quality and supportable data rate for each hop between nodes. The nodes use coded orthogonal frequency domain modulation for a more robust link than the protocols used for wi-fi. The network is also self-healing. If a node is removed or a link is broken, for example because of interference or the introduction of a large obstacle, the mesh will try to reroute via another set of nodes. This can provide significant redundancy and resilience, but depends on the network topology. For example, if nodes are arranged in a long line, with each link operating at the extreme of its range, and the node in the middle is taken out, then connectivity between the two ends of the line will be lost as there is no way to reroute the network. Rather than using a collision detection algorithm, access to the network is controlled by a token that is passed around each node in turn. Only when a node has possession of the token can it transmit its data. This token-based mechanism leads to a much more efficient use of the channels and a much more consistent latency that minimises the delays when carrying video packets. Soldiers mesh with radio Communications The network is self-healing, and the mesh will try to reroute via other nodes