Inter-Satillite Link
 

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Each of the six satellites must be able to communicate with each other.  When a satellites receives a signal from a terminal, it must relay it to the satellite that is communicating with the destination terminal.  Or if the packet is destined for Earth, it must relay it to the satellite that has the Earth link. 

The satellite link will use TDM to bundle all the packets and send them in one large 100 Mbps data link.  This should be enough bandwidth to handle all realistic communication scenarios.

 

Satellite to Satellite Link Budget

Units Value
Transmitted Power dBW 10.00
Frequency Hz 1.40E+10
Wavelength m 0.02143
Diameter (Satillite Antenna) m 0.50
Satellite Antenna Efficiency   0.80
Gain (Satellite Antenna) dBi 36.33
Noise Temperature (blackbody) K 15
Noise Temperature (Satellite LNA) K 30
Max Distance m 2.11E+07
Loss (propagation loss) dB -201.85
Bandwidth Hz 2.00E+08
Possible Alignment Error dB 3
Design Margin dB 2
   
Signal Power Received dBW -124.19
Noise Power dBW -129.06
C/N dB 4.87
Required C/N (w/ Turbo Coding) dB 0.9
Extra C/N Margin dB 3.97

Only 10 watts must be used for this link.  Half meter parabolic dishes are used as the antennas between satellites.  Again turbo coding is used for this link.

 

Satellite Transceiver Design

 

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