Satellite Communications/Satellite communication

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Question
Hi Mr.Rao,
I would like to know why we need to confirm the current polarisation of any cross-pole satellite during uplink.

Answer
Hi Mr Sumit,
There are two primary reasons for polarization compatibility. Both transmit and receive sides need to be compatible to the Satellite specifications. Otherwise, during transmission if you are a little bit away from the LOS of the satellite of your service, you will be interfering with the other satellite reception. Similarly in the receive side. Particularly in the modern satellite communications systems with higher spectrum bands like Ku and Ka etc., the same satellites use multi polarization feeds and also co located satellites use similar polarization orthogonally. The satellite Operators also will not qualify the Earth Station for use of their Transponders if this confirmation is not achieved.
Also cross polarization does not mean there is no leakage in the other polarization: only the limit should not be exceeding.
So it is mandatory that the actual numbers have to be achieved for polarization pattern.
Specifically your answer would be more and more relevant if the satellites may be collocated!!
Cheers/GTRao

Satellite Communications

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TIRUMALA RAO G

Expertise

Satellite Communications Applications, Link Calculations, Teleports, Earth Stations,VSAT, Tracking, Mobile Communications, Next Generation Networks.

Experience

40 Years. Indian Space Research Organisation, PANAMSAT, Satellite Based VSAT Networks, IP Networks.

Organizations
ISRO, PANAMSAT, Engineering Institution for Higher Education (GVP College of Engineering), Consultancy.

Education/Credentials
Graduate in Electronics and Communication Engineering with Distinction. Guiding scholars for their Doctoral thesis in related areas in Academics.

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