Application Of Radio Direction-finding Communication System In Airborne Troops Gather

Airborne operation has become a very important war manner in the modern and future information-based war.Quick reaction was the most important battle effectiveness of airborne troops,Thereinto,quick gather was not only a part of quick reaction,but also an important guarantee of improving viability and battle effectiveness of airborne troops . Quick gather must depend on reliant positioning system and communication system . At present , positioning equipment that have been used in airborne troops all over the world generally work depending on secondary planet system . Whereas , secondary planet system is liable to be interfered even be destroyed,therefore,it's necessary to select the other positioning mode to deal with the change of future war.The radio direction-finding communication system without depending on substitute secondary planet system has been designed in this article.The system consists of one center set and a certain number of direction-finding set.The center set was applied to radiate electromagnetic wave that is used to direction-finding.The direction-finding set was applied to diagnose electromagnetic wave's direction of arrival that is launched from the center set.Short messages communication between the direction-finding set and the center set has been realized simultaneously.The system's radio direction-finding principle and communication principle were introduced firstly in this article,then partial of the system's hardware and software design were introduced.On the design of direction-finding circuit,the direction chart of small size annular antenna has been analyzed,the small size erect-placed dual annular antenna was used as direction-finding antenna,and the chip of MC3362 was used as reception chip between two direction-finding reception channels.On the design of communication circuit,the solution that direction-finding and communication shared with two reception antenna and two reception channels has been adopted,two phase-locked loops that have different function have been designed by using high performance dual phase-locked frequency synthesizer-MC145162 , finally , the high efficiency radiate frequency power amplifier that fits to system's battery voltage and output power has been designed.In order to raise sensitivity of direction-finding reception and communication reception,a low noise small signal amplifier with gain controlled , ahead of wireless reception module-MC3362 , has been designed . On the design of software , the principle of direction-finding algorithm has been introduced,some program and flow chart of direction-finding set and center set have been introduced too.After the prototype has been tested,its technical targets have reached design requirements.