Radar If Signal, Digital Reception Technology

Digitalization is very important in the modern radar systems, so it is very useful to study Digitized Receiver. Because of actual technology, it is difficult to sample RF signal, so we study IF Digitized Receiver now.Based on software radio technology, we have designed IF digital receiver based on PCI bus architecture. This paper included three parts: one is introduction of theory of IF digital receiver and system scheme demonstrating; the second is about implementation of IF system based on FPGA; the third is the design of PCI bus interface.The receiver is implemented through the large scale programmable FPGA chip. The radar IF signal after A/D sampling and digital down converter transfer to host through PCI bus for further signal processing. At the same time, data are converted to analog signal through D/A converter. The system based-on FPGA and PCI bus architecture updates software and hardware handily, economizes cost.The primary works in this paper are presented as follows:To complete the system scheme demonstrationTo complete the A/D sampling hardware circuit design of radar IF signal.To complete software and hardware design of IF processing based on FPGATo complete D/A converter hardware designTo complete PCI bus interface design The results of FPGA simulation indicate that the technique is feasible and the experiment results show that the performance of the system is excellent.