| Abstract: | With the continuous progress of satellite communication technology, the satellite-borne microwave frequency converter develops from single channel frequency to multi-local oscillator frequency points, multi-gain gears and componentization. The complex product conditions make the automatic test of frequency converter more and more challenging. Based on virtual instrument technology, this paper presents a special automatic test system for microwave frequency converter, which is suitable for three special working conditions: multiple local frequency points, multiple gain gears and multiple frequency channels. This paper focuses on the analysis of spectrum spray test characteristics of frequency converter in multi-local oscillator mode, and proposes a multi-mode spectrum search algorithm. By using the searching method of absolute frequency converting to search relative frequency, efficient automatic spectrum test is realized. Practice has proved that the automatic test system of special frequency converter based on virtual instrument technology combines modular hardware with customized software algorithm and test process, which has stronger product adaptability and can greatly improve the test efficiency of frequency converter products compared with the traditional test system. |
