Design Of Radio Compass Navigation System

Radio compass,as the radio navigation equipment with the longest history,provides pilots with relative ground beacon heading angle and gives guidance in aircraft departure,homing and auxiliary landing.It can be reliably and easily used and has provided services to all kinds of civil and military aircraft.The old wireless compass receiver system,featured by low modularity and poor reliability,is mainly implemented through analog circuits.The development of large-scale integrated circuit in modern time makes it imperative to innovate wireless compass technology.This paper first analyzes historical development and working principles of wireless compass and its signal forms.On the basis of theoretical analysis,the hardware and software of all functional modules of the compass receiver are designed before the overall joint debugging test is done.Hardware and software of the system are designed.In the hardware circuits,ZYNQ is used as the processor to provide a platform for the realization of the algorithm.In order to improve the reliability and maintainability of compass receiver,highly integrated devices are used to replace old-typed discrete simulator components.Intermediate frequency signals are sampled through the method of high-speed analog-to-digital conversion,which can improve the accuracy of course angle solution and the flexibility of signal processing.In the software design parts,drivers of each peripheral module are developed and signals are digitalized.After that,the algorithm of course angle solution is implemented: Firstly,the local carrier signals are generated and the detection signals are extracted by the carrier synchronous Costas ring and then the course angle is calculated by the arctangent phase discriminator.This can greatly improve the digitalized and modular degree of the compass receiver.The compass receiver made will perform joint debugging of the software and hardware.ADF exciter is also used to carry out the whole machine test.Angle performance indexes of compass receiver are designed based on the analysis of data.