| With the rapid development of communication technology,telemetry technology has an important position in the fields of national defense and aerospace.Today,when software radio technology is widely used,telemetry equipment has already changed the situation that different telemetry systems could not communicate due to different communication standards in the past,but the miniaturization of the system is still the focus of research,due to the discrete devices used in traditional communications In the design scheme,in the limited space of the missile-borne field,the proportion of the space occupied by the telemetry system is still not small.The software radio telemetry system implemented by AD9364 with ZYNQ can not only reduce the volume,power consumption and weight of the missile-borne telemetry system,but also rely on powerful software recon Fig urability to simplify the hardware design and improve the versatility of the equipment.The missile-borne miniaturized telemetry transmitter designed in this article uses QPSK modulation and uses AD9364+ZYNQ software radio technology to complete the entire communication system.First of all,by comparing the current digital modulation technology and combining with the environment in which the system is applied,QPSK technology is selected as the modulation technology of the system;secondly,the overall software radio telemetry transmitting system design plan is proposed,and the whole system is divided into ZYNQ The baseband processing part as the core and the RF transmitting part with AD9364 as the core are used as the basis for the miniaturization of the system;third,the hardware circuit design of the transmitter is completed,mainly including the ZYNQ circuit design and distribution of the digital baseband processing circuit Power supply design and clock design,as well as the design of radio frequency interface,clock interface,LVDS digital data interface,SPI interface,power supply and power amplifier circuit of radio frequency transmitting circuit.Finally,the software design and simulation of the transmitter are completed.The digital baseband processing module mainly completes the MATLAB simulation of QPSK modulation and the realization of FPGA.At the same time,the software design of the RF transmitter module is: enable state machine design,SPI interface logic design,LVDS digital data interface logic design and the register con Fig uration of AD9364,among which the register con Fig uration of AD9364 is the most important.Finally,a telemetry transmitter test system was built,and the telemetry transmitter was tested for single tone signal and modulation communication.After register con Fig uration was completed,the single tone signal waveform diagram was observed through a real-time spectrum analyzer,indicating that the single tone signal can be normal The transmission also proved the correct con Fig uration of the register,and at the same time,compared with the spectrogram received by the receiver,it was judged that the QPSK modulation communication was correct.In the data transmission and reception test,the baseband data rate is 8MHz,and the transmission frequency is 2.26 GHz.Through observation and analysis of the real-time data receiving diagram,it shows that the data communication of the telemetry transmitter is successful. |
