Abstract: A signal processing system of 3mm-wave pulse radars for RPVs is accomplished with DSP chip PDSP16510 and PLD Flex10k. The method of suppressing the main lobe clutter of airborne Pulse radars in video signal processing system is proposed to deal with the problem generally existing in airborne radars. The system has the advantages of high processing speed high range and spectrum resolution and easily programmable control. It also has the features of light weight small volume and high reliability. The measuring results are also given in this paper.