Analysis Of Relation Of Radiated Immunity Tests Between In Reverberation Chamber And In Anechoic Chamber

At present,the reverberation chamber method is more and more widely used for radiated immunity tests in the practical engineering.The way is used instead of the semi-anechoic chamber.The research of the relation is becoming more and more urgent.The relation between the results of radiated immunity tests is analyzed from two different angles,which are the coupling law of the antenna in reverberation chamber and in anechoic chamber and the electric field following the Rayleigh distribution.The directional coefficient D of the test equipment(EUT)was analyzed in semi-anechoic chamber.In addition,the uncertainty of both tests was studied.The main researchers in the thesis are listed as follow:1?The relationship between the received power and the field strength is analyzed in the reverberation chamber and in the anechoic chamber.The relation of the receiving power in the two chambers is obtained.The relation is related with the polarization matching factor P and the directivity coefficient D.Two models were established to analyze the polarization matching factor.CST is used to analyze the directivity factor of EUT.2?The principle of immunity determination is analyzed.The relationship between the sensitivity limit and the sensitive probability is obtained in reverberation chamber.When the complexity of EUT is greater than four and the electrical size is greater than three,the Monte-Carlo simulation method and Kolmogorov-Smirnov test are used to verify the conclusion that the radiation field of EUT obeys Rayleigh distribution.The method is applied to the determination of immunity.According to the conclusion of the reverberation chamber,the correlation of the sensitivity limit is obtained.3?The intrinsic uncertainty of the measurand(IFU)and the measurement instrumentation uncertainty(MIU)are discussed theoretically in reverberation chamber.Then the extended uncertainty is calculated.It is proved that IFU is the main factor in all uncertainty source in reverberation chamber.4?The measurement instrumentation uncertainty(MIU)is discussed theoretically in semi-anechoic chamber.Then the extended uncertainty is calculated.5?It is analyzed theoretically that radiation power and directivity of EUT obey chi square distribution with 2 degrees of freedom.According to the chi square distribution,the relationship between the directivity coefficient of the EUT and its electrical size is deduced.Monte Carlo simulations and experiments verify the relationship between the EUT directivity coefficient and the electrical size.6?According to the standard GJB151B-2013 and GB 17626.21-2015,the relation of the receiving power and the sensitivity limit between reverberation chamber and anechoic chamber are verified respectively by experiments.