Satcom-On-the-Move - General Dynamics SATCOM Technologies

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SOTM Operational Trade-Offs Satcom-On-the-Move the systems must simultaneously satisfy several different constraints, leading to a number of operational trade-offs © 2012 General Dynamics. All Rights Reserved. 8
SOTM is affected by downlink aperture size On the downlink, smaller antennas require more satellite transponder power and bandwidth for all services • Different ent satellites have different ent downlink EIRP capabilities • Satellite downlink EIRP is always limited to some level to avoid interference with other systems • Using different waveforms or modulation characteristics, we can design links to operate with different size antennas • The smallest size which can be used can be determined with a link analysis – It will be driven by the possible S/N to support the selected modem – Ultimately. it is limited by satellite EIRP and modem required Eb/No • Larger antennas will be more efficient in the use of satellite power and bandwidth, but smaller antennas can still be utilized for some links • The impact of this can be observed on the required downlink EIRP graph Satellite Downlink Power in dBW for 1 MBPS BPSK 40 35 Smaller apertures require more power Satellite Downlink EIRP (dB dBW) 30 25 20 15 10 C Dow n EIRP X Global Dow n EIRP X Spot Dow n EIRP Ku Dow n EIRP Ka Dow n EIRP 5 0 0.3 0.4 0.5 0.6 1 1.2 1.8 2.4 3.8 4.8 6.3 7.3 8.1 9 11 13 16.4 18.3 21 Downlink Antenna Aperture (Meters) © 2012 General Dynamics. All Rights Reserved. 9
Page 1 and 2: Satcom-On-the-Move Why One Size Doe
Page 3 and 4: The fundamental SOTM issue The chal
Page 5 and 6: SOTM links must be designed d diffe
Page 7: SOTM must meet ASI limits Compariso
Page 11 and 12: SOTM uplink aperture size and point
Page 13 and 14: SOTM uplink aperture size and point
Page 15 and 16: Cost also drives SOTM terminal trad
Page 17: Conclusion Satcom-On-the-Move has a

Satcom-On-the-Move - General Dynamics SATCOM Technologies

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