You are here:

Satellite Communications/Interference between satellites

Advertisement


Question
Hi,
 would you please till me how much is the distance between satellites in the same orbit & how can interference been minimized between satellites using the same frequencies & does two satellite have the same frequencies can share the same coverage area ?


many thanks

Answer
Hi Mujtaba,

That is indeed a good question, thanks for that.

The spacing between adjacent satellites is usually between 2 and 3 degrees.

The directivity and opening angle of antennas is such that they will only pick up signals from the satellites they are pointed to. Some power (interference) can be picked up in the side lobes. Specially for small antennas with a larger "opening angle" but this is just taken into account within the linkbudget and will reduce the maximum achievable C/N (and corresponding modcod or efficiency).

There might be some limitiations imposed by the satellite operator in uplink and downlink EIRP (power) in order to limit interferences caused by ASI (adjacent satellite interference)

Two or more satellites can indeed cover the same coverage area but it is the directivity of the antenna that allows "picking out" the signal from the desired satellite only.

I hope this is clear, if not, let me know.

Kind regards, Dave

Satellite Communications

All Answers


Answers by Expert:


Ask Experts

Volunteer


Dave Suffys

Expertise

Questions related to design of satellite communication links.

Experience

Satellite communication, link budgets, DVB-S2, ACM

Organizations
Newtec

Education/Credentials
Telecommunications engineer, Sales Support Manager at Newtec

©2016 About.com. All rights reserved.