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VSAT technology and installation >> Dish pointing and alignment >> VSAT adjacent satellite interference

Message started by wow on Sep 13th, 2008 at 6:34pm

Title: VSAT adjacent satellite interference
Post by wow on Sep 13th, 2008 at 6:34pm

How to calculate VSAT adjacent satellite interference?

Title: Re: VSAT adjacent satellite interference
Post by Eric Johnston on Sep 13th, 2008 at 10:54pm
On the downlink, consider the off-axis receive gain sidelobe envelope of your receive earth station antenna towards several nearby satellites either way along the orbit.

In each case take the downlink eirp from that satellite towards you, within the bandwidth of interest, and work out what noise entry appears at the imput to your LNA.  Add up the total downlink adjacent satellite interference.

On the uplink you need access to the uplink earth station details of networks working to adjacent satellites.  In each case take the earth station transmitter powers into the feed (not eirp), per relevent bandwidth, and multiply by the off axis transmit gains of the other networks earth stations.  Add up all the interferences contributions into your uplink at the satellite.

Best regards, Eric.

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