Research And Examinations On RCS Measurements In Microwave Anechoic Chamber

RCS measurement is necessary to research the electromagnetic scattering properties of radar target as well as to design stealth weapon system. The theory and algorithm of electromagnetic scattering computation can be verified by RCS measurement, moreover, it's difficult to compute electromagnetic scattering of complex objects, but the data can be obtained visually by RCS measurement.For one high and new technology project, Nanjing University of Aeronautics and Astronautics designed a multi-targets RF antenna measurement system. On the research of this antenna measurement system, this paper researches and develops one simple and fast RCS measurement technology——CW RCS measurement system, analyse three errors in the measurement. One is caused by microwave anechoic chamber and equipments, one is caused in the measurement, and the last one is caused by the difference between the model and the real object.With analyzing the results of the real measurements, we can know the CW RCS measurement system is suit for high frequency ( f≥2GHz) measurements. Besides, with developing the software and researching the data, it makes measurement more conveniently and correctly. As a graduate student, I take part in the whole process of this project and have much very important experience.For the disadvantage of the CW RCS measurement system, this paper researches and develops stepped frequency CW RCS measurement system. This system uses the stepped frequency signal produced byAgilent8530A, with the technologies of average, IFFT transform and time gate, it reduces the errors and get the time answer of RCS. Then use the time peak value composing technology to get the result of the RCS measurement.