Study Of Software Radio Technology In The Broadband Scanning Receiver

Based on the backgrounds development status and application value of the software radio, This paper introduces the software technology into the design of the broad band scanning receiver, and gives the design process with three modules: RF modules IF module and Baseband module. In RF module, This paper adopts DDS plus PLL mode, which scans the frequency range from 10~2000MHz with subsection, and downconverts the RF signal to IF, In subsequently IF module, This paper absorbs the new idea of the software radio, by bandpass sample technology with high speed A/D device, directly digitalize the IF signal and uses the digital downconverter(AD6620) to frequency conversion-, downspeed and filter the IF digital signal in order to be processed with DSP in real time. This paper gives a feasible scheme of the receiver and also gives the hardware and software design process of the key parts.