Acquisition of the QPSK demodulator in the presence of interferenceThe acquisition behavior of the tracking and data relay satellite system (TDRSS) receiver (a quadrative phase-shift keying (QPSK) demodulator using a dither lock detector) in the presence of interference from another user has been analyzed using a simulation model. The demodulator is composed of an automatic gain control, a QPSK Costas loop, a frequency sweep unit, lock test units, and a control unit. The simulation model has been tested for the following variables: signal and interference Doppler frequencies and phase offsets (with respect to initial voltage control oscillator setup), signal-to-interference ratio (SIR), and signal I/Q power ratio. The simulation results are discussed.
Document ID
19910068524
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Ghazvinian, Farzad (LinCom Corp. Los Angeles, CA, United States)
Chung, Char-Dir (LinCom Corp. Los Angeles, CA, United States)
Wang, James (LinCom Corp. Los Angeles, CA, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1990
Subject Category
Space Communications, Spacecraft Communications, Command And Tracking