الفهرس 
The Origins of Surveying
Modulation FormatsOnly 14 pages are availabe for public view
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Abstract
ost modem weapon systems and aircrafts depend, in part,
on the Global Positioning System (GPS) for navigation. This
reliance on GPS navigation dictates that it is important to study
how to implement a GPS jammer to reduce the effect of these
modem weapon systems which rely on GPS. The GPS system
has advantages over the narrow-band navigation systems since
GPS signals are spread-spectrum signals and receiver design
.. techniques can eliminate most of the interference signals.
This thesis provides studying of GPS satellite signal
structure. It also provides calculations to know the received
satellite signal power. In addition this thesis investigates GPS
satellites codes and then generates them. The thesis introduces
many steps that were followed for implementing GPS jammer.
First, frequency synthesizer was used to generate Ll frequency.
Second, a binary phase shift keying modulator (BPSK) was
designed and implemented to modulate this carrier by using the
generated satellite codes (coarse acquisition codes).GPS jammer
was implemented, then many experiments were performed for
testing its effect of jamming in different scenarios on different
kinds of GPS receivers.