| Modulation Domain is a plane domain which is consisted of the frequency and time of signals. It shows the relation between the frequency and the time. It is an indispensable field to measure signals in the three-dimension space (time domain, frequency domain and modulation domain). Modulation domain analysis offers a unique method for viewing complex modulated signals. Modulation Domain Analyzer is used in a wide range of applications including digital communication system, radar and electronic warfare system, mechanical electronic system and is necessary for researching, producing, maintaining modern military and civil electronic instruments. A practical Modulation Domain Analyzer has been made by our teacher and research group during the period of The 95 Plan,but the gap between the congener foreign apparatuses and our instrument is still large. The main objective of this project is to improve the stability and the performance of the system. It proves that the stability and the performance of the new system(MDPA-1) have been enhanced obviously by applying new techniques. The principle of the measure system, the key techniques,the frame of the system and technical specification of the system are introduced briefly in this paper at first. The design and realization of the circuit board in Modulation Domain Analyzer for testing the envelope of Radio Frequency Pulse are given in details in this paper including the Envelope of Radio Frequency Pulse Detecting Circuit,the Broad Band Magnifying Circuit,the AD Converter,the Logic Control Module of CPLD, the software block of the Control and Identification of Radio Frequency Envelope. The debug method of this circuit board,some measured data of the envelope of Radio Frequency Pulse and the analysis of the result are shortly presented in the end. |
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