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The Effects of Residual Carrier on Costas Loop Performance as Applied to the Space Shuttle Orbiter S-Band Uplink

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1 Author(s)
Simon, Marvin K. ; Jet Propulsion Lab., Pasadena, CA

When a Costas loop is operated in a PM mode, such as on the Space Shuttle OrbiterS-band uplink during the time when both data and a ranging subcarrier are linearly modulated on the carrier, and if the data modulation index is less thanpi/2, the loop must reconstruct its carrier reference from an input signal whose carrier component is not completely suppressed. This paper establishes a theory for the performance of Costas loops in the presence of residual carrier as a function of the key system parameters and applies this theory toward predicting the performance degradation in the PM mode (relative to PSK operation) of the ShuttleS-band uplink. The corresponding performance of the ranging channel is also given as a function of these same system parameters.

Published in:

Communications, IEEE Transactions on  (Volume:26 ,  Issue: 11 )