A modification of a Costas loop is described, and the false lock behavior of this system is studied. The modified Costas loop hard limits the output of the in-phase channel, replaces the analog multiplier with a chopper-type device, and is equipped with single-pole arm filters in the loop. The false lock behavior associated with the use of Manchester coded data is investigated; the results can be applied to the assessment of the false lock margin on the Ku-band uplink to the Space Shuttle Orbiter through the TURSS.
On the false lock behavior of polarity-type Costas loops with Manchester coded input
In: NTC ''77; National Telecommunications Conference ; 1977 ; Los Angeles, CA
1977-01-01
Miscellaneous
No indication
English
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