The paper studies the researching and imitating of the signal processing circuits of a warning radar-REL-5 1 radar. Firstly, the theory of the radar signal processing rack is introduced, and some Application Specific Integrated Circuits (ASIC) in this radar are analyzed in detail and then replaced with programmable logic devices. Then theory of communication interface circuit and weather channel processing circuit is presented. Finally we accomplish the researching work of relevant circuits. The work improves the project of the REL-51 radar imitating.
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