Design And Implementation Of Software Of HF Frequency Selection And Link Establishment System

HF communication mainly transmits by sky-wave,relying on ionosphere reflection to achieve information transmission.HF communication takes the ionosphere as a relay system,depends little on the environment of equipment,and thus ensures its status in the field of military communication as a kind of safeguard of emergency communication.With the expansion of new communication technologies and new requirements,HF communication will play a more and more important role in emergency communication.The research content comes from the project named as “The development of the frequency selection and link establishment system of HF communication”,and the research purpose is designing this system,which includes system application software and the software and hardware of the communication controller.The application software based on the general design of the system is designed and implemented in the paper.Firstly,according to the requirements of the project,the general framework,the hardware constitution,and the main functions of the frequency selection and link establishment system of HF communication is designed in the paper.The function of the system mainly includes frequency prediction function,automatic link establishment function,frequency updating function,communication function under a fixed frequency,and information display and processing function.Secondly,according to the hardware constitution,along with the corresponding programming technologies,the application software of the system and its communication interface protocol with the communication controller is formulated in the paper,where the communication interface protocol includes command interface protocol and the frame format of file transmitting.Then,under the framework of MFC application program,using the Visual C++ programming technology and the Ribbon interface developing technology,realizes the development of the application software of the system,and achieves all functions of the frequency selection and link establishment system of HF communication combining with the communication controller.The specific functions realized mainly include the detecting and link establishment under the blind scan and scan,the fast frequency update and the frequency update through detecting,the link establishment,the data transmission,sending data under double frequencies,and the display and processing of information.Adopting the frequency prediction method based on history record improved the accuracy of frequency prediction.Using the link establishment under different frequency enhanced the ratio of link establishment.In order to the elevate efficiency of the data transmission,the techniques of the file compressing,breakpoint retransmission and sending under double frequencies are employed.Finally,we perfected the application software of the system through the unit test and integration test.Combining the communication controller and integrated simulator of HF communication,the system test is made to further validate the functions of the system.Ultimately,the system passes the check and acceptance.