Abstract: Firstly,according to HF receiver design philosophy,this paper presents the platform of an IF receiving module which is based on the software radio.By means of analyzing the system’s functional requirements and the receiving echo characteristic,this paper discusses the implementations in each several part of this module.Above all,it especially introduces the implementing technique of signal collecting and processing unit.This IF receiving module has acted on a new type ionospheric oblique backscattering sounding system,which bases on the pseudo-random noise phase modulated pulse compression,can obtain abundant ionospheric sounding data.Because of utilizing the DSPs and FPGA technology as the core of whole system,the receiving module has the advantages of flexible processing methods,real-time digital processing and great easiness of upgrading.The sounding results indicate the justification and practicability of the receiving module.