Design And Implementation Of An No-blind-area High Frequency Wave Communication System On Airborne

In order to Adapt the requirement of integrated and miniaturized high frequency wave(HF)communication equipment on airborne platform and solves the problem of high frequency wave communication noise reflected by the troops ?the problem of using blind areas.Research on HF radio frequency(RF)digitalization,voice digitalization coding technology,noise reduction technology,HF no-blind-areas communication technology has been increasingly active.this Dissertation focus on the simulation of the HF no-blind-areas communication system,the integrated design and verification of short wave radio station and the voice short wave noise reduction technology.The main research contents are divided into three parts.The first part is mainly about the simulation and demonstration of no-blind-areas HF communication system.Through the gain simulation of the HF a ntenna and the short wave communication model,the possibility of HF no-blind-areas communication system is demonstrated by using the new 600 bps voice code technology.The result shows that HF no-blind-areas communication system can guarantee the installat ion of the system.The second part is mainly about the specific design content of HF no-blind-areas communication system,mainly including the design of shortwave radio and the principle design of shortwave antenna.The characteristics of miniaturization and synthesis of short wave radio stations have been highlighted.Through the use of radio frequency digital technology,the number of frequency and channel units of traditional radio stations are reduced.At the same time,the integrated design of transceiver and antenna automatic tuner is adopted.The volume weight of the new short wave end machine is only about 1/2 of the transmission short wave radio station.The design of the short wave antenna is designed according to the characteristics of the body.The antenna size is increased by the spiral mode.The antenna radiator uses titanium alloy.It has the characteristics of high strength,high and low temperature resistance and excellent three defense performance.The external wrapping protection material of the antenna is selected as the composite material with light quality,high strength and good toughness.The characteristics of high temperature resistance.The third part is mainly the verification content of the ground and airborne platform of the short wave and no blind area.Through the short wave communication of the near and middle distance of the ground,the short wave no blind area communication system can meet the requirements of the ground use.Aiming at the problem of large noise feedback on the system after installing the system,the voice and noise reduction algorithm is added to the function business software to solve the problem.In view of the weak jamming ability of the short wave end,19 band pass filter module is added to the front end of the radio frequency.The filter module restraining the out of band signal more than 20 dB,and improving the anti-interference ability of the short wave end machine.After the above optimization,the system has passed the validation test on the flight test.Through the simulation,design and verification of HF no-blind-areas communication system,the results show that the system can meet the short wave communication needs of the airborne platform.