Frag Out! Magazine
Issue link: https://fragout.uberflip.com/i/1488818
user to access data fed from EO systems of UAVs or fighting vehicles. The system allows the user to designate targets for the TOPAZ-integrat- ed BMS, and also to assess the damage inflicted on the target, through- out the engagement. Interestingly, SILENT NETWORK only emits EM signals when this is necessary. The system may remain in sleep mode, without any emis- sions, and a minimum battery/power supply usage, over longer periods. At the same time, the whole network may be re-activated in a few sec- onds, by one of the nodes. Every node only transmits data when data for transmission is fed into it. Depending on the quantity of data, the transmission time is mea- sured in 1.4 ms increments. This is the Base Time Window for the radio. The network may also use the MANET mechanism, or employ UAV/ node retransmission, with that node providing line-of-sight for all nodes. A combination of the above may be used as well. The retransmission mechanism does not require a network maintenance frame to be used. Comparison of EM emissions required for RF voice connection at a 20-kilometer distance *- Two MELP 2400 data packages sent + two UAV-transmitted packages. ** - Without base-station retransmission www.fragoutmag.com Radio Output Power [W] Channel Width [kHz] Spectral power density [W/kHz] Transmission time for 1 second of voice [s] EM emission per 1 second of voice/kHz [W/kHz] KF 150 3-24 6,25-50 1 6,25-50 UKF 50 25 2 1 2 GSM 2 200 0,01 0,125 0,00125 TETRA 1,8 12,5 0,14 1 0,14** PERAD 1 1250000 0,0008 0,0056* 0,0000045 www.fragoutmag.com