Abstract : This paper elucidates the working principle of a step-frequency through-wall radar. Based on the radar signal processing algorithm and the system's real-time requirements, a hardware platform for the radar signal processor is constructed using DSP and FPGA as the core, supplemented by dual-port RAM and USB. The system structure is designed. The main components of the signal processor are selected. The functional modules of the radar central controller are designed and implemented. The DSP algorithm software is designed, and its correctness is verified by processing measured data. Keywords : Step-frequency through-wall radar, signal processor, DSP, FPGA 1. Introduction Step-frequency through-wall radar is a new radar detection technology. It utilizes ultra-wideband step-frequency electromagnetic wave signals to penetrate non-transparent obstacles such as walls, achieving target detection, positioning, and imaging. It has important application value in disaster relief, law enforcement, and counter-terrorism. This radar features small size, light weight, low power consumption, high ranging accuracy, and short detection range. Therefore, both its algorithm and hardware structure are significantly different from traditional radars. This paper uses the TigerSHARC series DSP processor ADSP-TS201S from Analog Devices (ADI) as the main signal processor, and pairs it with a powerful programmable FPGA to support its interface for high-speed data exchange, thus constructing a hardware platform with strong processing capabilities, relative stability, and good versatility. (Download the paper "Design and Implementation of a Stepper Frequency Conversion Through-Wall Radar Signal Processor")