LightSquared Feederlink Earth Station

SED provided the Feederlink Earth Stations (FES’s) for LightSquared’s next generation of satellites. The new satellites depend on Ground Based Beam Forming to deliver a variety of voice and data services across North America.

SED provided four Ku-band FES’s under contract to Boeing that operates with the LightSquared SkyTerra 1 satellite. Each FES provides the communications traffic-carrying feeder links to the satellite, while two of the four stations also provide TT&C capabilities. Each station has a dedicated 11.3m primary antenna per satellite with a single 7.3m antenna provided for redundancy. The uplink and downlink RF chains also feature highly redundant systems to achieve exceptional system availability.

The FES interfaces with the GBBF at L-band and uses a single stage of frequency conversion to and from RF that is phase coherent across polarizations. The RF uplinks are optimized for NPR performance at high power levels and feature industry leading spurious performance. A Reference and Spectrum Monitoring System (RSMS) provides comprehensive self-monitoring capabilities using an enhanced version of SED’s Decimator product. The user interface to the system is SED’s Mon-A-Co M&C product for localized control at each station and centralized control at LightSquared’s Network Operations Center.

In addition to the design, development, integration, and commissioning tasks required for the FES, SED also provided system level analytical support to Boeing on topics such as frequency co-ordination and the impact of various weather effects on system performance.

MSV