Research on parallel processing method of ultra- wideband Linear Frequency Modulation signal based on FPGA

In the field of target detection, the radar resolution is constantly improving, and the radar signal bandwidth is proportional to the resolution. Therefore, large bandwidth radar signals bring great pressure on real-time signal processing, because the internal clock frequency of Field Programmable Gate Array (FPGA), which are currently commonly used signal processor devices, is usually at the level of one hundred MHz, which makes it difficult to process signals with a bandwidth of GHz level in real time. In this paper, for the real-time processing of large bandwidth Linear Frequency Modulation (LFM) signals, we study the LFM signal bandpass sampling theorem, and explore the use of FPGA computation running parallel processing characteristics to achieve the resource exchange frequency reduction real-time processing, that is, to reduce the operating frequency of the multi-module parallel processing of the signal at different times of the data, so as to achieve the frequency reduction and real-time processing. Through the parallel processing simulation experiments of wideband LFM signals based on FPGA, and taking the common digital down-conversion (DDC) processing in signal processing as an example, the real-time signal processing of 1.2 GHz wideband radar DDC has been successfully realised, and the real-time and completeness of data processing has been realised, thus verifying the validity of the method proposed in this paper. Therefore, the signal processing architecture proposed in this paper has important application value in large wideband radar signal processing.