The Design and Implementation of Signal Reconnaissance Receiver Based on FPGA

摘要

In this paper, a wideband, gain-flattened, highly-linear signal reconnaissance receiver worked on UAV with high sensitivity and high Dynamic range is proposed for complex electromagnetic environment of space and variable transmitter source. The reconnaissance receiver used field programmable gate array (FPGA) and some supporting chip and circuit to accomplish the frequency select and data storage. In order to reduce the noise figure, enhance the sensitivity and gain flatness, the design system used specific integrated circuit, variable gain amplifier (VGA), low noise amplifier (LNA), frequency selective circuit. And gain-flatness enhanced circuit. After some series of tests carried out by the unmanned helicopter, the tests and measured data and figure shows it can detect and receive the signal between 100MHz and 500MHz, the sensitivity is between -100dBm and -120dBm, the dynamic range is 70dB at least, it can suppress the strong narrowband interference (NBI).