CONTENTS

Annex 1
 1     Introduction
        1.1     Frequency considerations
        1.2     Generic mission parameters
 2     Link considerations
        2.1     Link performance
                  2.1.1     Data rate
                  2.1.2     BER
                  2.1.3     Margin requirement
        2.2     Modulation
        2.3     Deliverable power
        2.4     Received signal
        2.5     Link losses
        2.6     Transmit/receive telescope parameters
                  2.6.1     Diameter
                  2.6.2     Transmitting gain pattern
                  2.6.3     Receiving gain pattern
        2.7     Pointing and tracking
 3     Signal-to-noise ratio (SNR)
        3.1     Background signal
        3.2     Detector noise
 4     List of variables
Annex 2
 1     Antenna pattern for unobscured, circular transmitting apertures
 2     Antenna pattern for obscured, circular transmitting apertures
 3     Antenna pattern for unobscured, circular receiving apertures
 4     Antenna pattern for obscured, circular receiving apertures