Implementation Of Multi-mode Navigation Receiver Based On ZYNQ Platform

With the development of aviation industry,avionics equipment is developing in the direction of integration,modularization and generalization.For airborne navigation equipment,how to integrate and generalize land-based radio navigation equipment has become an important research direction in this field.According to the requirements of airborne navigation equipment of general aviation,the following research is carried out on the integration and synthesis of the functions of airborne navigation equipment of instrument landing system and Very High Frequency Omnidirectional Range.Firstly,the navigation principles of ILS and VOR are studied,and the composition of navigation system,angle measuring principle,generating mode of navigation signal and mathematical model are analyzed.Secondly,according to the national standard of instrument landing system and volt system,the function requirement and performance index requirement of multi-mode navigation receiver are analyzed,and the hardware design scheme of multi-mode navigation receiver is put forward.ZYNQ and AD9361 are adopted as the main components of RF receiving unit and baseband signal processing unit respectively,and the hardware platform of receiver signal processing function is built by designing the peripheral circuit.Thirdly,the processing flow of ILS and VOR signal is designed.Digital signal demodulation technique,baseband signal extraction method and digital filter method are used to solve the DDM and VOR phase difference of instrument landing signal.Using the digital signal processing development tool,the system Generator design model of each functional module is established,and the instrument landing signal and volt signal processing function based on FPGA are realized.Finally,the receiver’s digital baseband signal interface function and RF link data reception function are tested by digital loop test and actual RF signal,and the navigation parameter DDM of the instrument landing signal and the navigation parameter 30 Hz signal phase difference data analysis function of the volt signal are further tested.The test results show that when the receiver receives the heading and downflow input signals containing different DDMs,its heading DDM analysis value meets the index requirements of ±0.004 DDM,and the downdrawing DDM analysis value meets the requirements of the ±0.006 DDM index;when receiving the VOR input signal containing different fixed phase differences,its VOR angle analysis value meets the ±0.0262rad(±1.5°)index requirements.