Design And Implementation Of Short-wave Digital Multi-channel Channelized Receiver Based On Diversity Reception

Because of its simple structure and long transmission distance,the high frequency communication occupies a pivotal position in the military and emergency rescue.The traditional narrow-band analog receiver is difficult to adapt to the increasingly complicated and changeable electromagnetic environment.High frequency digital channelized receiver has been paid more and more attention due to its high precision,wide frequency range,flexible structure and high performance-to-price ratio.In this paper,a multi-channel channelized receiver system based on diversity reception is studied.The system can receive 10240 channels of 9.6KHz sampling rate,3KHz bandwidth,to achieve full frequency 1.49-30.01MHz full probability reception.This paper first introduces the research background,multirate digital signal processing theory of HF receiver,and discusses several types of digital channelized receiver is derived;secondly,according to the general requirements,design the overall scheme of the system;and then complete the design and Simulation of FPGA channel algorithm includes AD sampling module,digital conversion module,filter extraction module,WOLA channel module,frequency conversion,digital automatic gain control module and a high-speed data communication interface.Finally,debugging the algorithm module and the high-speed communication interface than testing the overall performance index of the system are based on the hardware platform.The experimental results show that the receiver sensitivity,dynamic range,bandwidth and other key indicators meet the design requirements and have certain practical value.