Electromagnetic Susceptibility Characteristic Research Of A Beidou Satellite Navigation Equipment

With the development and application of Beidou satellite navigation technology, navigation terminal plays an irreplaceable role as an important part of the system, at the same time, the electromagnetic compatibility of Beidou navigation terminal has aroused wide attention. At present, the existing standards are universal standards, there is still no EMC standards and specifications for the Beidou navigation products, therefore, it is of great significance and application prospect to research and analyze the susceptibility characteristic of the Beidou navigation terminal.This thesis focuses on the characteristics of electromagnetic susceptibility of a Beidou satellite navigation terminal., a set of Beidou navigation terminal device EMC susceptibility test plan to be elaborated from the test principles, protocols, and other aspects of the assessment results. The main contents of this thesis are summarized as follows:First, as a true signal strength of analog satellite signal reaches the device, in-depth analysis of the measurement method anechoic chamber in the satellite signal attenuation space, and then experiment to study the impact of the navigation simulator set different scenes of compact range in navigation terminal captures the sensitivity effect. Based on Beidou navigation terminal of the cable bundle into the conduction susceptibility experiment research, on different injection power, different frequency in two cases, sinusoidal continuous wave by current probe injection equipment of the power line interference,10kHz～400MHz sensitivity injection power and sensitivity curve, and found adjust the power input port impedance can effectively improve the navigation terminal conduction susceptibility.In electric field radiation susceptibility research, this thesis expounds the experimental principle and method, according to the distribution circuit parameters is established based on the theory of field irradiation of transmission line coupling model, analyzes the models for the telegraph equation and solving process, and semi anechoic chamber in a given transmission line relative mechanism model in electromagnetic radiation coupling simulation calculation, experiment and analysis of the frequency is 10MHz navigation simulation source signal intensity and susceptibility,50MHz frequency point grounding and susceptibility of the relationship, and puts forward the improving the susceptibility of field line coupling suppression measures.By analyzing uncertainty sources, analysis and calculation of the conducted susceptibility and radiated susceptibility of the combined uncertainty and expanded uncertainty. This test method Compass user machine susceptibility test characteristics provide the basis for the theory and technical support. While helping to develop corporate standards and norms Compass terminal testing, it has important practical value.