I recently came across this "Instructable" in which the user ahmedelsayed93 has created a project to detect obstacles in front of an ultrasonic sensor using Arduino Uno board. What is so great about it you ask, the video shows the ultrasonic sensor mounted on top of a servo motor to make a Radar detector and the plot on his screen makes it look like the radar images we see in movies and weather channels 
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The servo motor is controlled using an Arduino Uno which is communicating the sensor information serially to MATLAB and the data is plotted using MATLAB's built-in visualization functions.
Feel free to comment/provide suggestions to improve upon this project, I might incorporate them on my new software defined radio project that tracks airplanes.
