Radio Angle Measurement Technology Research Based On Multi-station

In the process of the vigorous development of military, unmanned aerial vehicle(uav) tt&c technology has paid more and more attention of people, and it has gradually become a hot topic of all scholars to study. Uav tt&c technology refers to the measurement of bearing, control and information transmission of the response type uav. In the process of implementation, because of the interference of signal is increasingly intensive in the increasingly complex electromagnetic environment, so the measurement and control system of uav is also put forward higher requirements to the direction precision, so the importance of the work is also self-evident.The establishment of the Angle measuring model of multiple base stations is based on the basic principle of phase difference finding direction. The purpose is to complete the azimuth measurement in the uav measurement and control technology in this dissertation. The whole system circuit is designed combined with high frequency electronics and radio knowledge. System consists of RF circuit, mixing circuit, phase discriminator circuit and display circuit. The RF circuit is used to implement the wireless data transmission function of this system. The wireless chip produced the carrier signal with 440 MHz by the control of MCU, and then the antenna transmits it out as positioning source. The main wireless chip receives the signal. On the Practice found that due to the frequency is too high, the phase measurement error will be big while the high frequency signal can be directly phase. Therefore, firstly, this system changed two lines of high frequency signal into the corresponding two intermediate frequency signal through the mixing circuit, then the system phase these two signals. Phase detecting circuit is used to test the phase difference detection of two intermediate frequency signals. The system obtained the angle information of the base station by the relationship between the azimuth and phase difference, eventually the display circuit display this information.Results of the test show that the radio angle measurement system based on multi-station is feasible. And it has advantages of simple, high precision compared with the single baseline system, etc. Although the results have certain error, it proves that the design has a certain research value and the meaning of exploitation.