Research Of Instrument Landing System Receiver Based On SDR

With the development of Software-Defined Radio technology and the improvement of chip performance,the development of Software-Defined Radio receivers are increasingly diversified,miniaturized and flexible.Gradually replaced the traditional receiver based on hardware circuit composition,and occupies an important position in the digital communication system.As a widely used aircraft landing guidance system in domestic airports,the instrument landing system can help pilots land safely.In order to avoid changes in the transmit signal of the instrument landing system due to external factors,flight calibration is required periodically to assess its operational status,and for the current airports for the instrument landing system flight calibration is time-consuming,costly,and difficult to execute.In this thesis,a miniaturized,low-power and light-weight receiver for instrument landing system is studied and applied to an unmanned airborne test platform,and the main work of this thesis as follows.1、Based on the principle of Software-Defined Radio,an FPGA+ARM based instrument landing system receiver hardware architecture is proposed,and its chip is selected,and the internal communication link of the receiver system is designed,which has the advantages of low cost,low power consumption,small size and easy development,and also supports rich peripheral interfaces to facilitate data transmission and storage.2、For the current domestic most of the research instrument landing system receiver algorithm is only applicable to single frequency modulation system,based on the principle of capture effect,proposed a dual-frequency instrument landing system receiver algorithm,and in the MATLAB simulation verification.3、For the frequency domain algorithm and time domain algorithm in the calculation and accuracy of the difference between the characteristics,from the perspective of time domain and frequency domain respectively proposed a receiver digital baseband signal processing scheme,and in the MATLAB simulation verification,further in the hardware platform for testing and analysis,can be more accurate to achieve the demodulation of the signal,and the demodulation data output to the upper computer for display and analysis.