| With the changing of social progress and the growing pattern of the world,the mission requirements of civil air defense sector are more and more stringent.Simple shortwave voice communication doesn't meet the requirements of the times and doesn't implement more data services.According to command of the communication task of civil air defense sector in peacetime and wartime,a shortwave radio and automatic processing system to send and receive messages is designed and implemented.Firstly,the hardware system is discussed and designed.Making full use of the existing air defense short-wave radio communication network,the data transmission hardware system consists of shortwave radio modem modules and computers,communication two sides use computer software and the serial to control HF modem modulation and demodulation of the data.Data to be transmitted via shortwave modem modulation is sent by shortwave radio,and signals received by shortwave radio are demodulated via shortwave modem and then the data is restored,and ultimately both data communications are completed.Secondly,the system software is designed and implemented in detail.The software system includes user login module,user management module,system settings module,file transfer module,short messages module,messages,radio parameter setting module,operation log management module and etc.The system settings,data transmitting and the serial communication are designed.The main function and class members of the above-mentioned functional modules and database operations,AES encryption and decryption software are achieved.Software codes of data transceiver module are design and given.The system database and interface software are designed.Before sending the data has been encrypted by using AES,to achieve a variety of safe and reliable data transmission.Finally,the designed system is tested and improved four times.The test results show that the system can send messages,short messages and files by point-to-point or broadcast. |
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