The Pentagon is among users concerned about LightSquared interference with GPS applications, for example.
The LightSquared L-Band terrestrial base stations broadcast on the adjacent frequency to the GPS satellites. The worry is that the much stronger signals from the earthbound LTE radios will stop terrestrial GPS receivers from locking on to the weaker signals from space. That is a well-founded concern.
By June 15, 2011, a working group report on such interference and how LightSquared will address the issues must be submitted. Typically, such interference issues are rectified using frequency filters or adjusting power levels or both. It might be difficult to reduce transmitting power from a terrestrial cell site enough to avoid interference with relatively-weak GPS signals, though. So filtering would seem to be the logical solution.
The LightSquared L-Band terrestrial base stations broadcast on the adjacent frequency to the GPS satellites. The worry is that the much stronger signals from the earthbound LTE radios will stop terrestrial GPS receivers from locking on to the weaker signals from space. That is a well-founded concern.
By June 15, 2011, a working group report on such interference and how LightSquared will address the issues must be submitted. Typically, such interference issues are rectified using frequency filters or adjusting power levels or both. It might be difficult to reduce transmitting power from a terrestrial cell site enough to avoid interference with relatively-weak GPS signals, though. So filtering would seem to be the logical solution.
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