Frequency hopping communication is known as the \"trump card\" weapon of radio. More and more avionics equipment adopts frequency hopping communication system. In order to ensure the performance of frequency hopping communication equipment, it is necessary to develop a frequency hopping signal source to detect it. Based on the analysis of the test and control requirements of a certain aviation communication equipment, a design scheme of a frequency hopping signal source based on \"DDS+PLL\" is proposed. The hardware composition of the system using MC145158 and AD9850 is introduced in detail, the hardware principle block diagram is given, and the working principle and workflow of the frequency synthesis unit circuit in the frequency hopping signal source are analyzed in detail. At the same time, the software workflow of the frequency synthesis unit is introduced. The test results show that the frequency resolution of the frequency hopping signal source is less than 1 Hz and the frequency conversion time is less than 1 μs.
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