Intersystem and Intrasystem Interference with Signal Imperfections
January 2004
John W. Betz, The MITRE Corporation
Lt. Bryan M. Titus, GPS Joint Program Office, Los Angeles Air Force Base
ABSTRACT
Analytical techniques have been developed and accepted as effective ways to assess the approximate effects of interference from Global Navigation Satellite System (GNSS) signals to the reception of signals from the same or other GNSSs. The methodology has been used to determine the effects of interference from different signals transmitted by the same system (intrasystem interference) and interference from signals transmitted by other systems (intersystem interference). However, the current methodology assumes that the set of transmitted signals is merely the superposition of ideally specified signals. In fact, transmitted signals have imperfections, and these imperfections can affect the level of interference. This paper extends the interference assessment methodology to include the effect of signal imperfections, adding consideration of different types of signal imperfections and evaluating their effect on intrasystem and intersystem interference.
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