| "Modulation Domain"(MOD) is a plane domain which is consisted of frequency and time of signals. It is necessary field to measure signals in three- dimension space of signal(time domain, frequency domain and modulation domain). In recent years, "Modulation domain analysis" offers a unique method for viewing complex modulated signals. "Modulation Domain Analyzer"(MDA) may be used to analyze signal features that include frequency ,time interval and phase. It has a wide range of application in digital communication system, radar and electronic warfare system, mechanical electronic system, etc. So our research on MDA is very important in the military and popular field. In the project of "Modulation Domain Analyzer", I programmed the systemic software of MDA. By using VC as programming tool, this software is based on module and object-oriented programming, which is easily operated and vivid. It included several parts, such as testing interface of MDA, the connection between software and hardware, display of data, display of curve and arithmetic of signal processing. The software accomplished tests to frequency, cycle, time distance, phase etc, and it made the signal processing. Besides the above all, it displayed the curve about frequency and time of the signal that the carrier wave is modulated by modulation wave such as sin wave, quadrate wave, triangle wave and sawtooth wave. Through our hard work , the MDA has increased the measurement of the pulse parameter and improved the capability of MDA, which filled up the blankness of our country in the field. But the software needs more improvement. |
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