Research On The Antenna Shape Of Navigation System And Anti-interference Design In FPGA

With the fast development of science and technology, navigation has become more and more closely related to people's life. However, due to the distinctive characteristics of the navigation signal, it can be disturbed very easily. Thus it's very important to study the anti-interference capability of the navigation receiver. Early receivers adopted single-antenna multi-delay systems to inhibit interference in a single domain, which usually had a bad performance. Nowadays, the development of the anti-interference technology has enabled the inhibition of interference respectively in time domain, amplitude domain, space domain, frequency domain and polarization domain, as well as the co-inhibition in multi-domains. The differences in the navigation receivers'receiving antenna lineups result in the differences in the anti-interference ability.Concerning the difference, this paper makes a study of the performance of the common antenna pattern, and analyzes the various characteristics by adopting Ansoft Hfss. And a conclusion is arrived at: the circular array provides the best antenna pattern with the best anti-interference ability. By combining a specific project, the FPGA-based anti-disturbance of navigation signals is realized in this paper. The project implementing the signal anti-jamming has some modules, such as LVDS transmitted module, the quadrature interpolation module, the module of the communication between FPGA and DSP, the adaptive beam-forming module, with the performance of every module analyzed and tested to meet specific standards of the project.