Design Of Radio Interface Based On FPGA

In the military command system, in general, earth-to-air radio stations are disposed along the border in the radar station, and the commander in a regional command center achieves air-ground command in a wide range of air space, so it is very significant for the radio remote control. In order to achieve the radio remote control, and save the channel resources, the PTT control signal modulates a single-frequency signal to sent along with the voice signal, control to ensure the signal transmission reliability.The topic sets earth- to-air communications system for the background,, deathly study the radio transformation interface design process and implementation of key technologies, in detail, introduces a signal processing of modular radio interface based on FPGA. In the software design of algorithm, focusing mainly on the signal processing algorithm both the PTT control signal and voice signal, and the FFT processor structure, FIR notch filter structure, threshold detection, stable algorithm and other related algorithms. In the system design, communicating the FPGA hardware with good performance and I2C bus with simple and effective; in the operation panel design, according to the system requirements with algorithms and real-time, developing a general-purpose, high-speed and FPGA-based computing board for audio processing module. The system has the flexibility to adjust the volume, high real-time, good reliability, and expandability features.Simulation result and environment test show that all specifications of the Radio interface converter modules can meet requirements of the system, the ground-air communication has been successfully used in some fire control radar due to its stable and perfect performance.