Electromagnetic spectrum scanning

• Main Author: Chen, Shi
• Other Authors: Lee Yee Hui
• Format: Theses and Dissertations
• Language: English
• Published: 2016
• Subjects: DRNTU::Engineering::Electrical and electronic engineering
• Online Access: http://hdl.handle.net/10356/68771
• Institution: Nanyang Technological University

The aim of this project is to develop an application that is able to scan the electromagnetic spectrum using the smart phone of Android system and the power level values from channels between 800MHz and 6GHz can be read easily. In other words, develop an Android application to realize the function whose principle is the same as the spectrum analyzer. The project begins with an introduction of background, which is mainly concerned about the principle of the spectrum analyzer, such as how to receive the signal and how to convert signal in the time domain into frequency domain. Then we consider how to use the mobile phone to realize the function of the spectrum analyzer. Firstly, a new mobile application is created by the Android studio. It is important to Iearn more about the Android platform, Java language and XML language. In addition, some questions also should be solved, such as using some Android API to receive the signal in the open area. The core of the dissertation is to convert the signal in the time domain into signal in the frequency domain, which is realized by Fast Fourier Transform (FFT) function. Generally, FFT function is simulated in MATLAB by inputting the familiar signal such as sine wave, modulated Gaussian Pulse.