Design And Implementation Of HF Digitalized IF Receiver

HF communication plays an irreplaceable role in various applications,especially in the field of military communication and emergency rescue.In the past,most HF radio mainly used analog technology,the modulation and demodulation,frequency conversion and filtering of signals are still used analogy circuits.the analogy channel technology is complex and difficult to produce,and it has a large volume,a high power consumption,it is not conducive to the integration of communication system.With the development of digital radio technology,analog channels are gradually digitized,compared with analog systems,it has small size and low power consumption,easy to integrate and extensible,become the current of communication system.Based on the IF digitalized receiver as the research subject,this paper introduce that design and realization process of the digital HF receiver based on ICNI system,as well as the main technical problem encountered in the test and the corresponding detail problem solving.The main research contents are divided into five parts: the development history and current situation of the technology of IF digitalized receiver is investigated.The main theory and key technology of realizing intermediate frequency digitization of HF receiver are summarized.According to the requirements of specific requirements and technical indicators,the overall design idea of the technology is demonstrated,and the detailed design scheme of each functional unit of the receiver and the design of the hardware circuit selection are completed.According to the design scheme,the engineering prototype of the digital HF receiver was developed and the function was tested,and the main technical indicators of the final receiver were tested.The main technical problems encountered in the development of engineering prototype are solved,and the detailed analysis,solving process and methods are given.The digital HF receiver has better performance than other traditionals.it has achieved the functional and the technical requirements.The application and development of digital IF receiver will provide a technical basis for the development and realization of software radio.