الفهرس 
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Abstract
This thesis presents development of an automated system made to measure the velocity
of a moving vehicle based on Doppler-e ect. Here we developed two velocity measuring
devices, an analouge high frequency one, to measure the relatively low car velocity and a
software de ned radio system at relatively low frequency to measure the velocity of the
high speed objects, the planes.
The rst velocity measuring system consists of three main parts:The frontend part, the
back end one and the digital processing part. After we made the analysis and simulation of
the system, we started the design of the front end which depends on Gunn diode oscillator
as micro wave source used to emit the signal in 24GHz and a Schottky diode reciever used
as a mixer or signal detector. The second area is based on detecting/measuring the Doppler
shift of the wave re
ected from the moving target then displaying the speed of the vehicle
after processing its information. The third area represents the add-ons of the system as
if the target exceeds a certain con gured limit representing a speci c speed. It initiates
a Java program to take a snapshot of that vehicle, getting the coordinates of its posi-
tion through Glopal Positioning system (GPS) technology then send all that information
through Multimedia Messaging System (MMS) to be tracked by a trac control system.
The modules of the system was working good, the design is really compact assembling a lot
of features integrated in small area and most of its components are o shelf components.
the other system on Doppler E ect is the most interesting as it’s targeting the
ying object.
The system could be used as a radar to detect planes, moving clouds, meteors. , which
can be used as a military or a remote sensing applications. The system uses the Cross
Ambiguity Function CAF to extract the Doppler shift and the time delay by comparing
two signals received to the system. This time, the system is implemented on a software
de ned radio developed by Universal Software Radio Peripheral (USRP).
Key words: Doppler shift, Gunn diode, Schottky diode, Horn antenna, Digital signal
processing, Global poisoning system, Multimedia Messaging system, Universal Software
Radio Peripheral, GNU radio, Cross ambiguity function, Radar.
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