Abstract
The thesis mainly focused to design and evaluates a real-time radio frequency measurement system by analyzing the synchronous signal intensity receiving of radiation. A hemispherical structure is adopted as the measuring chamber and the put a device in the center for the measuring; on the other hand, 217 pieces of sensor modules are aligned on the semi-sphere. Signals are collected by 8051 modules and transmitted the signals into FX2 micro-controller. Then the computer gets the near-field data from FX2 by USB2.0 .Because the radius of hemisphere is 50cm, the EM wave length which is under 5cm can be treated as far-field radiation pattern. For the wave length much larger than 5cm, the system uses the near-field to far-field transformation to get far-field radiation pattern. And the system presents 2D radiation pattern, 3D radiation pattern, 2D radiation pattern with polar coordinates and 2D radiation pattern with angle. Because the shields of the hemisphere are not perfect, the sensor modules receive many external electromagnetic noise. These unpredictable noise make the near-far field transformation deviate.